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Title: The mighty deep : and what we know of it
Author: Giberne, Agnes
Language: English
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THE MIGHTY DEEP
[Illustration:
_By permission of the Apothecaries’ Co., Ceylon_
BURST OF THE SOUTH-WEST MONSOON AGAINST THE COLOMBO BREAKWATER
_Frontispiece_
]
THE MIGHTY DEEP
AND WHAT WE KNOW OF IT
BY
AGNES GIBERNE
AUTHOR OF “SUN, MOON, AND STARS”; “RADIANT SUNS”; “ROY, A TALE OF THE
DAYS OF SIR JOHN MOORE”; ETC., ETC.
“If I had asked thee, saying, How many dwellings are there in the
heart of the Sea? ... peradventure thou wouldst say unto me, I never
went down into the Deep.” _2 Esdras_ iv. 7.
WITH ILLUSTRATIONS
London
C. Arthur Pearson Ltd.
Henrietta Street
1902
DEDICATED
TO THE REVERED MEMORY OF
VICTORIA THE GREAT, R.I.
SOVEREIGN LADY OF THE BRITISH EMPIRE
QUEEN OF THE OCEAN
AND
MOTHER OF HER PEOPLE
BY THE SAME AUTHOR
=ROY
A STORY OF THE PENINSULAR WAR=
_Crown 8vo, cloth, with illustrations, price 5s._
_PRESS NOTICES_
“An interesting and well-studied romance of military
adventure.”--_Scotsman._
“The illustrations are good, the writing is pithy, and the
tone well calculated to inspire youthful readers with lofty
ambitions.”--_Morning Advertiser._
LONDON: C. ARTHUR PEARSON, LIMITED
HENRIETTA STREET, W.C.
PREFACE
This little book makes no profession to be a systematic text-book
of Oceanography, or to contain exhaustive discussions of the latest
discoveries and theories. The subject is far too vast to be so dealt
with in one small volume. A library would almost be needed for the
purpose.
Much information has been gained within the last decade or two of years
about the Ocean, its make, the laws which govern its movements, its
dark and mysterious depths, the various deposits upon its bed, and the
innumerable living creatures by which it is inhabited. All that I have
attempted has been to cull a certain number of leading facts from the
great storehouse of knowledge, and to put them in order, for the many
who love sea-breezes and ocean-waves, and who may like to know a little
more about the friend whom they so often visit.
With regard to Authorities, I must acknowledge my indebtedness to the
following books, among many others: _The Realm of Nature_, by Dr. H.
R. Mill; _Report of the Scientific Results of the Voyage of H.M.S.
Challenger--Deep Sea; Coral Reefs_, by Professor Dana; _Standard
Natural History_, edited by J. S. Kingsley; _The Microscope_, by
Carpenter, revised edition; _British Merchant Service_, by R. J.
Cornwall-Jones; _Resources of the Sea_, by McIntosh; _Harvest of the
Sea_, by J. G. Bertram; also numerous papers and articles in the
_Geographical Magazine_, _National Geographical Magazine_, _Scottish
Geographical Magazine_, _Proceedings of Royal Society of Edinburgh_,
_Annual Report of Smithsonian Institution_, _Natural Science_, etc.,
etc., by such writers as Sir John Murray, Dr. H. R. Mill, Professor
James Geikie, Albert Prince of Monaco, Admiral Sir W. H. L. Wharton,
Mr. John Milne, Mr. A. Günther, Mr. John Aitkin, etc.
In conclusion, I beg heartily to thank the Librarians of the Royal
Geographical Society and the Zoological Society of London for the
generous courtesy with which they have lent me books and supplied
latest information, without which this little book could never have
been written; also to express my warm gratitude for the invaluable help
afforded by the criticisms and suggestions of the kind and able friends
who have read my MS. and proofs.
WORTON HOUSE, EASTBOURNE.
CONTENTS
CHAPTER PAGE
I. “THE SEA! THE OPEN SEA!” 1
II. SALT WATER 10
III. EARTH’S VAST OCEAN 19
IV. SUBJECT TO LAW 27
V. IN OCEAN DEPTHS 37
VI. RIVERS IN THE SEA 50
VII. OF WIND AND WATER 61
VIII. AN OCEAN OF AZURE 70
IX. ICE-NEEDLES TO ICE-MOUNTAINS 79
X. RECEIVING--TO GIVE AGAIN 89
XI. A STORY OF CONFLICT 102
XII. ABOUT THE LONG PAST 110
XIII. OLD OCEAN AS A BUILDER 122
XIV. HOW CHALK IS MADE 135
XV. OF OCEAN-WEEDS 149
XVI. CORAL ARCHITECTS 163
XVII. OVER THE OCEAN-BED 176
XVIII. MULTITUDINOUS LIFE 185
XIX. OCEAN FLOWERS AND LAMPS 196
XX. ARMOURED MYRIADS AND MONSTERS 207
XXI. A GOODLY COMPANY OF CRABS 220
XXII. THE WORLD OF FISHES 230
XXIII. SOME ODDITIES OF FISH-LIFE 241
XXIV. BEHEMOTHS OF THE OCEAN 252
XXV. “DOWN TO THE SEA IN SHIPS” 261
XXVI. AN EMPIRE: OCEAN-WIDE 276
LIST OF ILLUSTRATIONS
The burst of the South-west Monsoon against the
Colombo Breakwater _Frontispiece_
Bore of the Tsien Tang Kiang _Facing page_ 34
An Iceberg, showing the section under water ” 86
Diatom Cases ” 154
Part of Diatom Case ” 156
Deep-sea Fishes ” 182
Beam-trawl and Tow-net employed in deep-sea research ” 188
A Deep-sea Crab ” 220
A Blue Whale ” 254
THE MIGHTY DEEP
CHAPTER I.
“THE SEA! THE OPEN SEA!”
“How cheery are the mariners,
Those lovers of the sea,
Their hearts are like its yesty waves,
As bounding and as free.”--P. BENJAMEN.
“Therefore also do men entrust their lives to a little piece of wood.”
_Wisd. of Sol._ xiv. 5.
Once upon a time, over two thousand years ago, our ancestors lived in a
country smaller than ours, to the north-east.
They had not yet taken possession of two Isles, which in the then
distant future were to become the Headquarters of a world-wide Empire.
Already one characteristic of the race was prominent; they delighted in
the Sea. Within their small limits of power they ranged the Ocean, they
wrestled with its fury, they subdued it to their will, they rejoiced in
its strength, they found often their graves beneath its surface. The
English then, as now, were Ocean-folk.
May it not be that we in modern days love the sea, and flock to
its shores, and carry our Flag to its furthest bounds, because our
forefathers, the Norsemen, the Angles, the ancient Vikings, found their
joy in it? Their march, like ours, was on the mountain-wave; their
Home, like ours, was on the deep.
Probably with them, as with us, it was not always an unchastened joy.
Even a hardy Viking might know the unpleasant consequences of Ocean’s
rougher moods. But no such discomforts drove him to stay ashore.
Had our forefathers been made of feebler stuff, had they been easily
checked in their enterprises, centuries of history must have been
changed. The development of English nature would have followed other
lines.
In those days the fight could not but be severe. No mighty ironclads,
no huge three-deckers, existed. No P. and O. liners, no great merchant
ships ranged the seas. Our forefathers tackled the waste of waters with
what we should consider the merest cockleshells. Even in these days we
know what is meant by “perils of the seas;” but in those days the term
must have carried a hundred-fold deeper meaning, both to the brave
fellows who ventured on the stormy main, and to the waiting wives and
mothers on land.
All the more honour to them that they were not daunted. Each man’s
victory or failure in life’s battle cannot but help to shape the course
which his descendants in future ages will pursue.
The Sea for us has a vivid personality. We know grand old Neptune so
well, with his trident and his snowy hair, his dashing waves and his
impenetrable depths, his gentle breezes and his furious gales, his
moods of mild serenity and his fits of vehement wrath. He has his
faults; but in spite of all we love him.
At one time the Sea was for men a type of the Infinite, of the
Immeasurable, of the Boundless. We use still the same words; but they
have lost some of their force.
In these days the whole ocean has been mapped out from shore to shore.
We know exactly what countries lie round each part of it. We can tell
how long and how wide it is in any direction. As we stand on the shore,
and talk of the “boundless ocean,” we are perfectly well aware that
we are looking across to France or Spain, to Germany or Ireland or
America. Grand and far-reaching the sea still is, but to us no longer
“boundless.”
In ages gone by, those who stood upon the coasts of Palestine or Egypt,
of Greece or Italy, gazed towards unknown horizons, across what was
to them an illimitable ocean. The civilised world consisted of a few
countries bordering the Mediterranean on the east; and those countries
shaded off into unexplored barbaric regions. As for the “great Sea,”
as they called that which we regard as hardly more than a huge inland
lake, it was in their eyes the embodiment of Infinitude.
At a very early period, long before the English Nation was dreamt of,
before the Roman Empire had grown into being, while the polished Greek
of the future was still a semi-savage, a nation of Ocean-lovers already
existed. These were the Phenicians, foreshadowing in their pluck and
enterprise the sea-going British of later times.
They, unlike the sailors of other nations, did not merely hug the
shore, but ventured out into the trackless ocean. They, unlike the
sailors of other nations, did not go upon the sea only in daylight, but
they traversed it also in the dark hours of night.
At first they were content with the nearer reaches of the Indian Ocean,
and with the more eastern parts of the Mediterranean. But gradually
they wandered farther. Colony after colony was planted beyond Egypt,
till they reached the Pillars of Hercules, known to us as the Straits
of Gibraltar, to face a wild and strange Ocean, full of mystery.
There they made a startling discovery, enough to impress the more
thoughtful minds among them. Far to the east, in the “Indian Ocean” of
our days, their sailors had been acquainted with high and low tides;
while throughout the Mediterranean scarcely any tides existed. But in
the open sea, outside the narrow Channel, they found the very same
tidal changes as in the eastern ocean.
It is hardly to be supposed that any one of them had a mind of such
far-seeing grasp that he should be able to conjecture the grand truth
of eastern and western oceans being ONE--swayed by the same influences,
governed by the same laws.
A Phenician of those days, catching a glimpse of this truth, would have
been worthy to take rank beside our Sir Isaac Newton of after days.
They are believed to have observed the coincidence; no doubt with a
feeling of wonder; and probably it was to them merely a coincidence.
Very little was then understood of the most everyday and commonplace
workings of Nature.
Not much, indeed, can be said with certainty of what the Phenicians did
truly discover. Some observations they must have made of the heavenly
constellations; and the Pole-star at least must have been known to
them, otherwise it is impossible to imagine how they could have steered
their vessels at night, in an age when the Mariner’s Compass was
unknown. They are supposed to have sailed far south on the west coast
of Africa, if they did not actually round the Cape of Good Hope.
It does not appear that their knowledge was passed on to the Greek
nation. Either they were curiously reticent of what they knew, or else
such records as they may have left were destroyed and forgotten.
In after times the Carthaginians, descendants of Phenician Colonists,
were, like their forefathers, sea-lovers, sea-explorers, searching
the main, not as travellers search now from pure love of knowledge,
or from a liking for adventure, but for the sake of commerce. The
Carthaginians, however, instead of being able to make use of previous
discoveries, and to work onwards from a point already gained, had to
start afresh and to find their way--just as if it had never been found
before--to and beyond the Pillars of Hercules.
To the Greek imagination that wide mysterious Ocean, opening out from
the narrow Strait, was unattractive and terrible. It was a sea of
limitless distances, of fog and gloom, of blackness and death; not an
unexplored Ocean of possible glory and beauty and wealth.
Time glided by, and man advanced in his acquaintance with Land and Sea;
but with the latter slowly. It was not until five centuries ago--and
five centuries are but as a day, compared with the full stretch of
history--that two weighty steps were taken.
One step was southward. One step was westward.
The African Continent, all along its northern region, had been the
scene of very old-world history. But the south was shrouded in
darkness. A brief glimmer of light, perhaps thrown there in Phenician
days, had been long long lost sight of.
In the year A.D. 1486, a far leap from Phenician and Grecian days,
Bartholomew Diaz made discovery of the Cape of Good Hope, and one year
later Vasco da Gama sailed round it. These two explorers were only a
little in advance of two greater voyagers. In 1492 Christopher Columbus
started on his first cruise into the unknown West--and touched Land.
Less than thirty years later, Magellan’s famous voyage was accomplished
to those Straits, between Patagonia and Tierra del Fuego, which bear
his name. By that time the existence of the American Continent had
become an established fact.
But that Continent had to be searched out. And the Ocean, though its
limits were widened in men’s imaginations, was very far from being
mapped and fenced around with definite boundaries. Years of exploration
still lay ahead; and many a valiant explorer had to fall a martyr in
the cause of Science, before mystery should yield to knowledge.
Doubtless, in those days as in these, there was always somebody to ask,
“But what is the use? What good can it do to us to learn that there are
lands beyond the sea? What shall we gain by it all?”
Time alone, with its developments, with the growth of the human race,
with the enormous possibilities then undreamt-of, could answer such
questionings. Happily, brave explorers have seldom been lacking,
who loving knowledge for its own sake have been content to labour
patiently, not for money, not for fame, not for immediate results, but
for the simple delight of better understanding the world around them,
and for the benefit of future generations.
And indeed, if once we begin clearly to realise that the things which
we see and hear, the wonders of Land and Ocean, are the outcome and
expression of Divine Thought, we shall scarcely deem time wasted, which
is spent in trying to find out a little more about those wonders.
CHAPTER II.
SALT WATER
“The new sight, the new wondrous sight,
The waters around me turbulent.”
E. B. BROWNING.
“Water, water, everywhere,
And not a drop to drink.”--S. T. COLERIDGE.
The annual stampede of Britons to the coast says much for our National
belief in Sea-breezes. In other countries also people go to the sea for
change; but perhaps nowhere does the rush excel that on our Island.
This revivifying gift, though partly due to the wide and free expanse
through which the breezes have travelled, is largely owing to the briny
ocean with which they have been in contact.
Sea-water differs from rain-water, well-water, river-water. True, it is
made up of all these, since sooner or later and in one mode or another
all water on Earth finds its way to the Ocean. Water may travel openly
by river-routes; it may creep silently by dark and devious underground
passages; it may float lightly _viâ_ cloudland; but in any case its
goal is the sea.
Still, though the ocean includes in its composition every kind of
land-water, Sea-water as such is different from them all. Not only in
its vast extent, in its enormous depth, but in its strong flavour of
Salt.
One of the commonest of substances is Salt. It is in the ground, in
air, in water. We even know that it does not belong to our earth alone,
but to many heavenly bodies also.
Perhaps one reason for this abundance, at least upon our Earth, is
that it is necessary for life. There is salt in the make of blood and
of brain, of muscle and of tendon. Salt is perpetually passing out of
a man’s body; therefore continual fresh supplies of it are needed.
Without a certain amount of salt in his food, he cannot keep in good
health.
This at one time was not understood; and salt was looked upon as a mere
luxury, easily to be dispensed with. Condemned criminals were forbidden
that luxury; and they went through a good deal of suffering, the reason
for which was not guessed. If plenty of animal and vegetable food was
given to them, they managed to get along, since both contain salt; but
if they were kept on purely farinaceous fare, they broke down.
Where all the salt in the Ocean comes from, is a complex question.
Large supplies are brought down annually by rivers and streams, from
various minerals in their beds, as well as from rock-salt regions. But
if we ask, “How comes the rock-salt to be there?” we are told that it
is a deposit, once formed beneath ocean-waters, or at least left by
the drying up of salt lakes and seas. A proof of the latter theory is
found in multitudes of sea-shells, often distributed through layers of
rock-salt.
If much sea-salt came originally from rock-salt on land, and if
rock-salt came originally from ocean-deposits, we are led into a
curious circle of cause and effect--not unlike that of oak and acorn,
or of hen and egg, with the attendant puzzle of--Which first? It is a
query which we are not able to answer.
In former days the salt used for household and mercantile purposes was
almost entirely prepared by the evaporation of sea-water. We no longer
depend on this, however; and in England the sea-salt trade has gone
down greatly before that of rock-salt, which is found to be the better
for table use. It has not the same tendency to stick together in
lumps, after being packed in sacks.
Great districts of rock-salt are found in many places--such as those
in the Carpathian Mountains, in the Swiss Alps, in Germany, and in
Great Britain. One huge mine in Galicia has been worked for six hundred
years; and this supply is said to reach through about five hundred
miles. From British works alone the quantity carried away every year
amounts to a cubic mile of salt.
But land-supplies grow pale and insignificant before the quantities
which float in the ocean. It has been reckoned that, if the waters of
the whole ocean could be dried up, the amount of salt left lying on the
ocean-bed would be something like four-and-a-half millions of cubic
miles.
Such an enormous mass hardly conveys a clear idea. Let us think of one
single cubic mile of sea-water, separated from the ocean, and see how
much it would contain. First, the whole of that cubic mile of water has
to be dried up; and then the materials left behind have to be weighed.
We should find about thirty-three millions of tons of various kinds
of substances, the names of which need not be given. We should also
find of common salt a supply which, when weighed, would reach the great
figure of _one hundred and seventeen millions of tons_. All this, be it
remembered, floating unseen in a single cubic mile of water. No wonder
the sea tastes salt.
In its make Water is always the same. Whether it be cold or hot,
freezing or boiling, causes no difference. It consists of two gases,
united; and the union is remarkable in kind. The two gases are not
merely mixed together, as sand and sugar may be mixed. They are by the
union changed into a fresh substance. For the time the gases exist no
longer. In their stead, water has been formed.
And when the gases enter into this very close relationship, they do it
always in the same manner. There is just so much of the one, and just
so much of the other. One portion of hydrogen has to join with eight
times as much by weight of oxygen--neither more nor less of either. The
same is true, whether we are speaking of a great mass of water, or of
the tiniest speck.
It is not actually correct to say, as is said above, that water
“consists” of the two gases. So long as the water exists, the gases do
not exist. And when, through the action of heat or electricity, the
water is broken up and the gases reappear, then the water no longer
exists. But at least we may say that it is the result of the uniting of
those two gases, and that it can be made in no other way.
An interesting experiment has been tried. A certain amount of hydrogen
gas and eight times as much of oxygen gas were weighed separately, by
means of very delicate instruments. Then through great heat the two
were caused to unite into water, and the water also was weighed. It
was found to be just as heavy as the two gases together had been; and
quite naturally so, since neither of the two gases had lost or gained
in weight. This kind of union is called “chemical.”
French people are fond of “eau sucré.” A lump of sugar is dropped into
a glass of water, and it disappears. But it has not been destroyed.
It has not ceased to be sugar. No mysterious union has taken place
between the sugar and the water. Neither water nor sugar has changed
its nature; and no fresh substance has come into existence in their
stead. The water is there, as it was before. The sugar is there too,
not visible, but to be found out by our sense of taste. It has only
been separated by the water into such minute particles that we cannot
see them. This is a case of mixing, not of chemical union.
When we think of the characteristics of Sea Water, as compared with
Fresh Water, we have to do with simple mixing. As sugar floats, unseen
but not untasted, in tea or coffee; so salt floats, unseen but not
untasted, in ocean waters.
Such a thing as absolutely pure water is very rare. No matter how clear
a stream may seem to us, it holds a vast number of specks of material,
collected from earth and air. Once a scientific man had some, most
carefully distilled, which seemed to be of crystal purity. But he put
it under the strong beam of an electric lamp, and, alas, for human
powers! after so doing he could only declare that the idea of purity
was ludicrous. If it is so with distilled water, the less said the
better about common drinking-water. It may be well for our peace of
mind that we have not stronger sight.
Ocean-water holds about two hundred times as much dissolved material as
ordinary fresh water. The different kinds of substances found in any
particular water-supply determine the character of that water, making
it sweet or sour or salt, rendering it health-giving or death-dealing.
Something has been said about the drying away of sea-water, and the
leaving of salt behind. A remarkable instance of salt thus left is seen
in the Rann of Cutch, a flat Indian plain, about a hundred and ninety
miles long, and half as wide.
During the south-west monsoon the ocean waters are forced by powerful
winds up the Gulf of Cutch to a considerable height, overspreading the
Rann, which for a time is turned into a shallow lake. When dry weather
comes, the water vanishes, partly retiring, partly evaporating; and a
salt-strewn desert is left, varied by sand-ridges, green spots, and
little lakes, but covered principally by “sheets of salt crust.” My
father, when there many years ago with his Regiment, noted down his
impressions of the scene.
“From this spot”--the spot on which he stood--“the water is about eight
miles distant, the intermediate space being a flat surface, entirely
covered a quarter of an inch thick with salt in crystals, looking much
like snow, in such quantities that it can be scraped up by the hand
perfectly free from earth; and on all this space not a blade of grass
to be seen.”
The same task is carried on by the working of sun-heat, as by the fire
under a kettle. All day long in a warm climate the sun’s rays are
busily at work, lifting from the ocean-surface a continuous stream of
fine invisible vapour. The water is drawn up particle by particle, not
in masses; and the sun’s rays have no power to lift the ocean-salt,
which remains behind, floating still in the sea.
But when a strong wind lashes the surface into waves, and rends the
tops of billows into fine spray, it often carries a great deal of salt
to a distance. We know how salt may be tasted on the lips miles inland,
and how windows near the coast become encrusted with it in stormy
weather. Moving air, like moving water, can carry weight; and it is
thus, through the action of moving air, and not through the heat of the
sun, that we have our health-giving breezes off the sea, laden with
salt.
CHAPTER III.
EARTH’S VAST OCEAN
“Thou great strong sea.”--AUBERON HERBERT.
“Drop by drop He counts
The flood of Ocean as it mounts.”--C. ROSSETTI.
In these days we know the Ocean as one vast whole. Not like our early
forefathers, standing on the brink, to gaze with awe-stricken eyes into
mysterious distances, and to speculate upon the unknown.
Minor oceans do exist, certainly. We have the Atlantic, North and
South; the Pacific, North and South; the Arctic, the Antarctic, and the
Indian. Yet for us there is but one great world-wide OCEAN, encircling
the Earth, every part being in connection with every other part.
A drop of water which to-day floats in southern seas may, months or
years hence, have found its way by currents into the far north. A speck
of ice, at this moment fast in the rigid embrace of polar berg or floe,
may, months or years hence, be washing to and fro in tropical waters.
A much greater area of water than of land is found upon the Earth’s
surface. So vast is the amount of the former that, if the whole had to
be put into separate vessels, each vessel being one cubic mile in size,
the number of such vessels required would amount to no less than _three
hundred and thirty-five millions_. This very large order speaks for
itself.
The outer Crust of our Earth, taking land and sea together, may be
divided into three distinct parts. Like most such divisions in Nature,
the one is often found to glide by gentle stages into another.
We have, first, Land, rising above the sea-level, and consisting of
plains, undulations, hills, mountains. It covers altogether less than
one-third of the Earth’s surface, and it is called THE CONTINENTAL
AREA, though Islands as well as Continents belong to it.
We have, secondly, the Ocean-floor under deeper parts of the Ocean;
that which lies beyond a depth of about two miles. This division has
been described as the “great submerged plain,” and it comprises about
one-half of the Earth’s surface. It is known as THE ABYSMAL AREA.
We have, thirdly, a middle region, which may be spoken of as a kind
of borderland under the sea, connecting the dry land with the greater
ocean-depths. It amounts to about one-sixth of the Earth’s surface, and
it has been named THE TRANSITIONAL AREA.
By “connecting” the two, I do not mean that it must always be between
the two. It does very generally so lie, but there are exceptions. Some
deeper portions of the sea are close to land, and some parts of the
Transitional Area are found far out at sea.
The meaning of the word “Continental” needs no explanation; and the
very word “Abysmal” carries its own sense. More, however, will be
said in future chapters about those reaches of ocean known as the
“Transitional Area.”
A curious law seems to have governed the grouping of land and water.
Putting aside innumerable small islands, scattered about, we find that
the great mass of land clusters towards and round the north pole, with
a water-and-ice-filled hollow for its centre. While, on the contrary,
the greater mass of water may be said to cluster towards and round the
south pole, with--so far as we can conjecture--a large extent of land
for its centre. The conditions of north and south thus seem to be
exactly reversed.
Not long ago it was believed that the ocean’s floor might be a fairly
close imitation of that which we see on land. The differences, however,
have been found to be greater than was expected. Perhaps it is not
surprising, when one thinks of the immense levelling power of water.
That must be a firm make of rock which can permanently resist the
effect of sea waves breaking upon or near the shore. And even deeper
down, where waves are not and currents may be slow, some movement must
still exist, since the ocean is nowhere quite stagnant. Such movements,
no matter how gentle, would tend to shift all loose and soft substances.
The ocean-bed is held to be generally flat, though with gradual slopes
here and there, leading up or down to higher or lower levels. Many
submarine mountains rear their heads, sometimes near the surface,
sometimes above it. In places high mountain-ridges run for a long
distance below the sea, with profound depths on either side; and these
again often show their peaks, forming groups of islands.
Broad reaches of the ocean are between two and three miles deep, and
here and there spots are found where the sounding-line goes sheer down
three miles, four miles, five miles, even six miles, before touching
bottom. These greater depressions have been named “Deeps.”
At least fifteen of them are known in the Atlantic, and twenty-four
in the Pacific; many of the latter lying close to islands. Some are
long in shape, some short; some are broad, some narrow. One of the
most profound, and almost the only one known to exceed five thousand
fathoms, lies towards the south-east of the Friendly Islands. A
depth there has been found five hundred and thirty feet beyond five
geographical miles; and five geographical miles are equal to almost six
of our common miles.
For a good while the notion was entertained that, probably, the
loftiest mountain-peak on land, and the deepest depth in the ocean,
would about match one another, reckoned from the sea-level. But this
particular “deep” in the Pacific sinks two thousand feet lower than
the topmost peak on Earth rises. Mount Everest, in the Himalayas,
is twenty-nine thousand feet high; and this ocean-depth is about
thirty-one thousand feet deep. Only one other equal to it has yet been
discovered.
No abyss divides England from France. The “silver streak,” though
sufficient for purposes of defence, is comparatively shallow. All
West Europe, indeed, rises from a plateau, reaching from Norway into
the Atlantic, on no part of which is the water more than six hundred
feet in depth. The “transitional area” in this case makes a true
stepping-stone or ledge between dry land and ocean’s abyss.
But another great plateau in the Atlantic, which may be called the
“backbone” of that Ocean, is far from land, running roughly from north
to south. It follows the outlines of the eastern and western shores,
and rises often to within a mile and a half of the surface. On either
side of the “backbone,” which seems to be largely volcanic, is a deep
trough, lying north and south, and varying in depth from two to four
miles. This plateau unites Europe with Iceland; and it forms a bond
between the Islands of the Azores, Ascension, and Tristan D’Acunha.
If by any means the whole ocean-surface could be lowered six hundred
feet, remarkable results would be seen.
At once the British Isles would cease to be Islands. They would become
a part of the Continent of Europe, joined thereto by dry land. The
Hebrides, the Orkneys, the Shetlands, would share in this change. The
Continents of Asia and North America would be united at the Behring
Straits; Ceylon would find itself a part of India; Papua and Tasmania
would be one with Australia; and all places hitherto on the coasts of
different countries would find themselves six hundred feet above the
sea.
Such a change in the position of the British Isles, transforming them
into a Continental Country, would mean far-reaching consequences to
ourselves as a People. One such consequence may be briefly given in
the words of a recent newspaper article: “Dry up the Atlantic to
the 100-fathom line, and in six months we should bear the load of
Conscription as cheerfully and more efficiently than any nation in
Europe.”
Suppose that another great fall in the ocean-surface could follow. Not
this time to six hundred feet, but to three thousand feet, below its
present level. The resulting alterations would be still more sweeping.
Not only Iceland and the Färoe Islands, but Greenland also--and not
only Greenland, but the Continent of North America itself--would become
one with the Continent of Europe, no longer cut off from the Old World.
A word as to measurements. Two kinds of “miles” have been mentioned.
There is the ordinary “Statute mile,” used in common conversation,
which is 880 fathoms, or 1,760 yards, in length. There is also the
“Geographical” or “Nautical” mile--the “knot” of our Navy--which is
1,013 fathoms or 2,026 yards in length.
The difference between the two is not far from one-eighth of a statute
mile. Roughly, seven miles are equal to six knots. A fathom is six feet
or two yards.
CHAPTER IV.
SUBJECT TO LAW
“Thou rulest the raging of the Sea.”--PSALM lxxxix. 9.
“Nothing useless is or low,
Each thing in its place is best,
And what seems but idle show
Strengthens and supports the rest.”--LONGFELLOW.
Things are what they are in this world very largely because of the pull
of opposing forces, and among such forces not one is more universal
than that of Gravity. Many causes beside Weight have their share in
making our Earth what it is; but if Weight were banished from our
midst, the Earth as we know it would exist no longer.
The only way to get rid of weight would be by getting rid of Gravity.
And since no force in Nature acts more steadily and incessantly than
this, we are no more likely to get rid of it than we are to get rid of
the world itself.
Gravity, or Gravitation, or Attraction--it is known by all these names.
Sometimes it is called a Law; sometimes a Force. Neither term may be
counted amiss. No law is worth anything without a sufficient force to
back it up; and no force is worth anything unless it acts according to
law. But we might almost as reasonably call this behaviour of things
“an Obedience” as “a Law.”
Each particle of each substance draws and is drawn by each other
particle of every substance. And each body in the Universe, from a
grain of sand to a sun, draws and is drawn by each other body, whether
far or near. All these drawings are in obedience to that mysterious
something--that force, or power, or influence--which has been named
Attraction or Gravitation. So much we know; and beyond it we know very
little as to the nature of the said “Attraction;” but we find that the
outcome of it is Weight.
By means of weight, the sun, the moon, the planets, yes, and even the
countless multitudes of stars, are kept in their paths; in each case
the inward pulling being counterbalanced by the impetus and outward
pulling of a rapid rush. By means of weight, houses, rocks, stones rest
firmly on the earth; by means of weight, the atmosphere is bound to
the earth, the Ocean to its bed. Had sea-water no weight it might be
scattered as fine water-dust through Space.
A larger and heavier Earth would bind down the ocean yet more strongly,
while a smaller and lighter Earth would have a weaker grip. Easily
as the sea is now stirred by every passing breeze, an ocean such as
ours on a little world like the Moon or Mercury would be more rapidly
agitated. The waves would leap higher with less cause.
So the Ocean, like the Land, is subject to law, knowing neither repose
nor action except in obedience to Nature’s forces.
When ocean-waters lie still as a mill-pond, they do so through an
exact _poise_ of contending powers. When waves rush high and currents
pour strongly, each movement is still in strict obedience to governing
forces, which are themselves governed by law. Each movement is due to
a long series of past movements; and each in turn helps to bring about
a long series of future movements. There are no breaks in the chain.
Every effect is also a cause.
Currents here and drifts there; breezes here and hurricanes there; all
these disturb the calm of the sea. Only for a brief spell, in one part
or another, is the pull of opposing forces so far balanced that the
water can lie still. And at most the stillness is comparative. Even
in a so-called “dead calm” gentle heavings to and fro will be found.
Absolute placidity in the ocean is a thing unknown.
Even when the waters are at their stillest they are always being drawn
steadily towards Earth’s centre. A perfectly level ocean would mean
each portion of its surface being equally distant from that centre.
The ocean ever strives after this ideal, but never attains to it; yet,
century after century that aim is pursued, with a perseverance which
might afford a lesson to ourselves.
Despite all this change and restlessness, we talk of the ocean having a
“level” surface. We picture it to our minds as being in outer shape the
same as that of the Earth--a sphere. But this is not strictly true to
fact.
If we could look upon the Earth, with large far-seeing eyes, from a
few thousands of miles off, we should find curious irregularities in
the watery outline. Instead of showing all round a smooth surface, the
ocean would be found to rise here and sink there, to be in one part
higher, in another part lower. A man roving over the ocean, all about
the Earth, would have in places to ascend undulations like hills,
almost high enough sometimes to be called mountains, in other parts to
descend declivities.
Most of us have noticed in a cup filled with water, that the
water-surface is not perfectly flat. Close to the sides of the cup may
be noticed a distinct rise. It is the same in a tumbler, in a basin,
in a slender glass tube. For the sides of the cup or tumbler or tube
attract the water, drawing it upward; and this is known as Capillary
Attraction.
With the ocean the very same thing is seen. If high land borders on
deep water, the extra attraction of mountain-masses will act just as
the sides of a cup or tumbler will act. They draw upward the water of
the ocean to a higher level. When I say that this is “seen,” I do not
mean that any careless looker-on will be aware of the fact. It has to
be discovered by careful measurement.
In some cases a marked difference has been found. The enormous masses
of the Himalayas, for instance, exert a powerful drawing upon the
neighbouring sea; and at the delta of the Indus the ocean-level, in
consequence of that attraction, is actually three hundred feet higher
than on the coast of Ceylon.
Besides land attraction, winds have an extraordinary power to heap up
waters in one place more than in another. To some slight extent this
may be seen upon English shores, when a strong gale happens to blow
landward at high tide. On such occasions the waters often rise far
beyond their usual mark.
Mention was made earlier of those Phenicians who, having known an
eastern ocean with tides, and a Mediterranean Sea without tides, must
have been perplexed to find a western ocean which corresponded with the
eastern in its ebb and flow.
We all know for ourselves in these later days, how the tides rise and
fall around our coast, twice in twenty-four hours. Each high-water
is twelve hours and twenty-five minutes later than the last; so each
succeeding day sees a difference of fifty minutes in the time of high
or of low tide.
To a very large extent Tides are due to the attractive power of the
moon. They are due also to the sun, but in a much less degree, which at
first sight seems singular, since the attraction of the sun, by reason
of its greater size, far exceeds that of the moon. From the fact,
however, that the powerful drawing of the sun comes from an immense
distance, it follows that it has much less effect than the small
attraction of the moon, which comes from very near at hand.
Her influence over our earth is exerted far more strongly with respect
to those ocean-waters lying just under herself, and far less with
respect to those waters on the farther side of the globe. The effect of
these different pullings is to raise a double wave or swell,--one on
the surface of the ocean just below the moon, and one on the opposite
side of the earth. The waves mean high tides; and low tides occur at
places half-way between them.
Were the whole Earth covered by one continuous sheet of water, these
tidal waves would travel round and round the globe, in a fashion
easy and pleasant for students of the subject. Unfortunately for the
said students, their motions are very complicated. In the northern
hemisphere, where land is abundant, the tidal waves are greatly
interfered with by continents and islands. Often the most that each can
do, as it sweeps along, is to send side-waves and currents journeying
northward into channels and bays, estuaries and lesser seas.
Through the open ocean the tidal wave has no great height. Probably in
central regions of the Pacific it rises only some three or four feet
above the usual sea-level. But when the flow enters narrowing bays and
channels, a very different result is seen; and the waters are often
piled up in a wonderful manner,--as in the Bristol Channel, where the
level at high tide is sometimes nearly forty feet above that at low
tide.
A marked contrast to this is seen in the Mediterranean. There, as
already said, practically no tides exist. The rise and fall amount at
most to only a few inches. Instead of a wide entrance and a narrowing
estuary, we have just the opposite--a narrow entrance and a widening
sea beyond. Connection with the outside ocean is too restricted to
admit of any full flow of the tidal wave.
Solar tides, or tides brought about by the sun’s attraction, are much
the same in cause and effect as lunar tides, only far smaller in
degree. When Sun and Moon happen to be on the same side of the Earth,
or on different sides but in the same line, so that their combined pull
is exerted in one direction, we have Spring Tides. These are always at
the time of New Moon and Full Moon. Sun and Moon then work together,
each helping the other in a common aim; and the ocean-waters rise
higher and sink lower than at other times.
When Sun and Moon are so placed with regard to the Earth, that they
exercise their pull in a cross direction, Neap Tides result,--that
is tides which have small ebb and flow. In this case the sun hinders
instead of helping the moon, and the moon does the same for the sun,
each tending to counteract the work of the other.
Connected with and partly caused by the rise of the tide is the curious
phenomenon known as a “Bore”--a single high wave, moving onward like a
wall of water, with great rapidity and a roaring noise. More usually
this belongs to a river, and thus it has not much connection with
the subject of the ocean; but it is also sometimes seen in sharply
narrowing estuaries or ocean inlets.
[Illustration: BORE OF THE TSIEN TANG KIANG
_Face page 34_
]
To the inhabitants of a flat and unprotected country, bordering on
river or estuary, the bore is often a thing of terror, for its advent
is uncertain and abrupt, and in its upward rush it sweeps everything
before it. The entering of such a wave into the Severn is an almost
daily event, and it reaches often a height of many feet. Bores are
usual, too, in the River St. Lawrence, in the Hoogly, in an estuary
of the Bay of Fundy, and in other places innumerable; and they vary in
height from two or three feet to over twelve feet. The effect of such
a wall of water as this, deluging low lands, carrying away trees and
houses and living creatures, may be easily imagined.
CHAPTER V.
IN OCEAN DEPTHS
“My soul is full of longing
For the secret of the Sea.”--LONGFELLOW.
“Of the old Sea some reverential fear
Is with me.”--WORDSWORTH.
Through ages of the world’s history, man knew nothing of the Ocean
beyond its surface.
He could sail on the sea; he could bathe in the shallow waters near
land. If a good swimmer, he might go farther out, and might even dive
for one or two minutes out of sight. In more recent times, with the
help of a diving-bell, he could descend thirty or forty feet; and in a
diving-dress he might even, if experienced, get from one to two hundred
feet down.
But that was all. Of the vast depths beyond he was sublimely ignorant.
He did not so much as know of their existence. Until the late
scientific expedition made in the vessel _Challenger_, that great world
of the Under-Ocean was swathed in mystery.
Nothing is known of it now by direct personal observation. No living
man may penetrate those depths. The only mode in which we can learn
what is, what lives, what happens there, is by means of “soundings,” by
sending down and drawing up specially prepared instruments, the reading
of which gives us information about that Under-world.
Soundings made in earlier times did little more than tell navigators
how deep the sea thereabout might be. Such instruments as were then
used could neither work beyond a limited depth, nor say their say with
accuracy.
Of late years immense improvements have taken place, both in the make
of the machines employed, and in the methods of working them. Past
soundings were few and unsystematic; whereas now they are many and
by rule. Thermometers have been made which bring up from the bottom
of the sea reports of the prevailing heat or cold, moving unaffected
through warm or cold layers between. Specimens of the materials which
lie on the ocean-floor have been brought to light, and analysed. Living
creatures in great numbers have been hauled from their own domains,
examined and classified.
All this means progress. And though, no doubt, fifty or a hundred years
hence, that which we now know will be looked upon as the barest A B
C of the science, still our knowledge is growing year by year. The
Under-Ocean is no longer a vague fairy-land of possible mermaids, or a
waste region of death.
A region of death in one sense it is and must be. All living creatures
that die in the sea, unless devoured by other creatures, sink to the
bottom, there to find a tomb. Covered at first by a vast winding-sheet
of water, they may be slowly buried under the shifting mud and sand.
But in this sense the whole Crust of Earth may be called one vast
sepulchre, wherein all animals that die are entombed.
People are slow to realise how modern is our knowledge of ocean-depths.
About three hundred years ago a famous navigator made the first
sounding which went below two hundred fathoms--that is, about one
hundred feet deeper than the height of Beachy Head from the shore.
He at once decided that, by a happy chance, he had alighted upon the
uttermost depth in the ocean.
To him it was an awe-inspiring profundity. Yet, when viewed beside
such abysses as have been recently discovered, depths of five and six
miles, his little “deep” was as a saucer beside a lake.
It is not easy to picture to ourselves the changeless calm of those
abysses--those five or six miles of under-water, with nothing from
sea-level to sea-floor to break the dead monotony.
Throughout such regions storms, no matter how terrible, have no power.
Winds cannot reach them. When Ocean’s surface is lashed by a hurricane
into wild commotion, that commotion is superficial. It means a furious
stirring and flurry of upper layers; and it means no more.
If at the height of some fierce tornado, a sailor could leave his
tossing straining ship, and could dive far into the sea, keeping
breath and sense and life, he would soon quit the turmoil, and would
find himself in a scene of deep repose. Strange to say, the idea of
submarine ships actually doing this has been mooted, as one of the new
projects in the beginning of the Twentieth Century.
Wave-motion does not descend much below the surface. It is believed
that the depth of water affected by a wave is usually about equal to
the space which divides crest from crest. So, if we are looking at
little ripples, flowing one after another, with crests perhaps one
foot apart, we may suppose that the water is disturbed by those ripples
to a depth of about one foot. Or, if we are watching larger waves, with
crests twenty feet apart, we may suppose the disturbance to reach down
to a depth of some twenty feet. And if our gaze is fixed on dignified
Atlantic rollers, with crests six or eight hundred feet apart, we may
suppose that the sea is affected to a depth of six or eight hundred
feet--less and less affected the deeper we go down.
Six or eight hundred feet, compared with six miles, are hardly more
than a man’s skin compared with his body. And beyond the shallow depths
where wind and wave have sway, we come to a region of profound calm.
This repose does not mean stagnation. Ocean’s waters are ever on the
move, travelling this way and that way. Currents exist far below,
as well as at the surface; but they are generally slow and placid,
not rough and hurrying. Old Ocean’s excitability lies all outside.
Superficially he is soon upset; but deep down he is composed.
A great deal of discussion has taken place as to possibilities of Light
in those depths. Are they black with midnight darkness? or do faint
glimmers of daylight creep through?
Ocean-water, like other water, is transparent. Any substance is
transparent, when thin enough,--even gold. A very thin film of water
is not, however, needed for transparency. Many feet, even many yards,
may be seen through, if clear and pure. Few of us have not, at one time
or another, looked down from a boat, to see golden sand, variegated
pebbles, small fishes swimming about, at a considerable depth.
Thus with water, as with denser materials, transparency is merely a
question of thickness. As the thickness increases, more and more rays
of sunlight are taken captive, and the water becomes less and less
translucent, till at length, if we could get deep enough, we should
find ourselves to be surrounded with blackness.
Another feature of ocean-depths is that of immense pressure.
We bear a certain degree of it in that other and lighter ocean--the
Atmosphere. A man of medium size has upon his body about thirty
thousand pounds’ weight, or some fifteen pounds to the square inch. But
this is nothing to what he would have to endure down in ocean-waters.
At a depth of one mile, an extra ton would be piled upon each square
inch of his body; two miles down, would mean two extra tons on each
square inch; three miles down, three extra tons; and so on. The load
would soon become intolerable.
For many years scientists maintained that in such depths no life could
exist, since no bodies could withstand the awful pressure. Yet we now
know that frail jelly-fish, fragile shell-inhabitants, do withstand it,
flourishing there by myriads.
Perhaps the fact was somewhat overlooked, that the pressure upon a
living creature is not only inwards from without, but also is outwards
from within. This is true of ourselves in the ocean of air, breathing
air. It is true of creatures in the ocean of water, breathing water.
Much less than the weight of thirty thousand pounds might crush a man
flat, were it not for the resisting pressure from within. If for one
instant he could empty his body of all inner air and liquids, and could
so harden his skin that no air should squeeze through its pores, he
would be pressed as flat as a pancake by the surrounding atmosphere.
A story has been told, illustrative of this. Once upon a time a clever
fellow started an original idea. He proposed to make a balloon, which
should mount skywards, not from being full of hydrogen gas, but from
being emptied of air. Being then lighter than the atmosphere, it would,
he said, of course rise.
So far as the reasoning went, it was faultless. It only did not go far
enough.
The balloon being made, he named a day for its ascent, and asked
many friends to witness his triumph. At the last moment, all air was
withdrawn; and everybody waited in expectation, hoping to see the novel
balloon skim lightly above their heads.
But the inventor, while using strong materials, had failed to make full
allowance for the tremendous pressure of the air, when counteractive
pressure from within should have been done away with. As the air was
drawn out, the sides of the balloon collapsed, being crushed together
as an empty egg-shell may be smashed in a boy’s hand. Instead of
soaring gaily upward, the would-be aeronaut stood on earth, scanning
with disappointed eyes a flattened and useless shell.
A diver going down into the sea has a much increased weight upon his
body; but he does not suffer from it to a serious extent, provided that
he is not raised or lowered too fast. Much depends upon this. Both
men and beasts can endure a good deal of alteration in the degree of
pressure, whether from air or from water; but they cannot bear very
abrupt changes. Hearts and lungs need time for growing accustomed to a
fresh condition. In early days of diving this was not understood, and
some divers lost their lives through being too hurriedly hauled up.
The same has been noticed in animals brought quickly from great depths.
They have been constantly found in the net or trawl, dying or dead,
their bodies swollen and even bursting from the lessening of pressure.
It was natural that at first the belief should arise of Life being in
those parts impossible. Now we know that animals die in the act of
being drawn up, and that they live and flourish in profound depths,
unaffected by the vast load of water.
The weight that a man can endure is not to be compared with what
fragile sea-creatures thrive under. Beyond a depth of some two hundred
feet or more, the pressure becomes too great for any human beings; yet
animals are found at depths of three or four miles. But the fact that
man breathes air, and that animals in the sea breathe, in a sense,
water, makes an enormous difference in their power to resist pressure.
One might suppose that the terrific weight of miles of water would
squeeze lower layers to a smaller bulk. Water is, however, very
difficult to compress; unlike air.
At the bottom of the sea, four or five miles deep, the weight is said
to be equal to about four tons upon the square inch. If this tremendous
load were pressing upon a mass of air, eleven thousand cubic feet in
quantity, the whole would be crushed together into only twenty-two
cubic feet. But the same weight pressing upon the same quantity of
sea-water, would merely reduce its size to ten thousand cubic feet. So
there is not much difference between the make of sea-water near the
surface and sea-water at a great depth.
Not only are ocean’s depths calm and free from storms; not only are
they black with midnight darkness; not only are they heavy with the
weight of miles of water overhead; but also for the most part they are
cold.
Changes from season to season, like changes of weather, are
superficial. At a depth of about six hundred feet, Seasons have ceased
to be. There, summer and winter, autumn and spring, exist no longer.
The dead level of calm and darkness is also a dead level of uniform
weather and unalterable climate. Where changes of cold and heat do
come about, they are very uncertain, and usually they are due to other
causes than those which bring about the succession of seasons upon
Earth.
Many remarkable facts have lately come to light with respect to Ocean’s
temperatures. In far northern and far southern regions, near the two
poles, the whole sea is very cold. One might expect the converse of
this in tropical regions--a whole sea intensely warm. But this we do
not find. The shallower parts--those included in the hundred-fathom
limit--may be nearly as warm below as above. When, however, deep-sea
soundings are made, when the registering thermometer is despatched on
its mission of inquiry miles below the surface, then the report brought
up is generally of great cold.
In almost all deeper parts, the tale is told of a frigid
under-layer,--of water nearly and sometimes quite down to the
freezing-point of fresh water. This, not only in Polar Seas, not only
in Temperate Oceans, but in the hottest portions of the Tropics. The
Atlantic, near the equator, is icy in its depths.
A reckoning has been made that, if the floor of the whole ocean,
omitting shallower parts, could be divided into one hundred equal
portions, ninety-two of those portions would be found covered by water
at a temperature of less than 40°; and only eight of them would lie
under warm water. The vast mass of the ocean is cold, with a thin warm
layer over certain districts.
Little doubt can there be that this under-layer is largely fed from
polar regions.
We know that cold ocean-rivers pour from north-polar regions to the
south, both in the Atlantic and in the Pacific. A general creeping
under-flow of icy waters towards the equator evidently balances the
general surface drift of warm waters towards the poles. Since cold
water is heavier than warm, it would naturally find its way to lower
depths, leaving the warm light liquid to float on the top.
In the Mediterranean Sea a marked contrast is found. There no ice-cold
layer is spread over the bottom; and the water in its uttermost
depths--over two miles and a quarter--does not sink below the
temperature of 54° F. The heat of the sun in South Europe can hardly be
compared with the heat of the sun over the Indian Ocean. Yet the latter
has water far below the surface down to at least 35°.
Practically the Mediterranean, despite its depth, may be looked upon as
an inland sea. The one opening which connects it with the open ocean is
not only comparatively narrow, but also is shallow, being less than two
hundred fathoms deep. The water on this dividing ridge remains at about
55°, and the Mediterranean throughout, to its greatest depths, keeps to
about that same degree of warmth. No entrance is afforded to the heavy
cold currents from polar regions.
The Red Sea is separated from the Indian Ocean by a similar ridge, and
the same result is seen there. Over the floor of the Indian Ocean lies
a carpet of chill water. But the whole body of the Red Sea never sinks,
in summer or winter, below 70° F. Here, too, the cold streams are not
able to surmount the barrier.
In many deep mid-ocean hollows, cut off by surrounding sub-ocean walls
of rock, the same is found again--warm water within the hollow, cold
water on the ocean-bed outside.
CHAPTER VI.
RIVERS IN THE SEA
“Sinuous or straight, now rapid and now slow.”--COWPER.
“As winds that coerce the sea.”--C. G. ROSSETTI.
Actual Rivers in the Ocean; distinct streams of water, flowing over a
bed of water, with banks of water. Not merely one or two such rivers,
but scores of them, hundreds of them, great and small, in all parts of
the world.
Chief perhaps in importance is the Gulf Stream, that vast flood which
pours out of the Gulf of Mexico, and acts as a winter heating apparatus
for the west of Europe. Though by no means the largest of ocean
streams, it is one of the most useful to man.
After quitting the Gulf, it hurries at speed through the Straits of
Florida; then spreads out into a river, about fifty miles wide and over
two thousand feet deep, journeying at a rate of some sixty miles in
twelve hours.
For a while it hugs the American coast; but, happily for Europe, it
forsakes this friend of its youth, and wanders to the north-eastward
across the Atlantic.
To call it a “river” is no mere fiction of speech. Near Halifax the
separation between warm and cold water is so sharp, that those on board
a ship may know what latitude they have reached, on entering or leaving
the stream, by simply dipping a bucket in the water and taking the
temperature. Literally the Gulf Stream is a warm river, flowing over a
bed of cold water, with cold-water banks.
So far as Cape Hatteras the stream clings to its early friend; and
after that the American coast knows it no more, being left to the
mercies of a very different acquaintance. An icy stream flows southward
from the far north, clinging to the coast of North America, while we
in western Europe benefit by the presence of the warm current which
travels over to us. This stream has been described as forming a “cold
wall” to the mild Gulf Stream.
Fan-like, the Gulf Stream spreads as it journeys, growing gradually
wider and wider, shallower and shallower, cooler and cooler--yet the
last so slowly that, even off the coast of Scotland, water nine
hundred fathoms deep is found to be at 40° F.
How strongly this mass of warm water affects the air above it is well
known to sailors. When passing from the stream to the outside ocean, or
from the ocean to the stream, they often change in a few hours from a
warm to a cool or from a cool to a warm climate. The atmosphere is ever
ready to tune its mood sympathetically to that of the ocean over which
it sweeps.
We know well in Great Britain that our soft south-west breezes seldom
fail to bring us warmth; though we do not always remember the debt that
we owe to our friend the Gulf Stream.
But for the immense stores of heat carried northward, and given over
to us, our Island climate would be different indeed from what it now
is. That is why our fellow-subjects in eastern and central Canada,
living no farther from the equator than we do ourselves, suffer from
an intensity of cold in winter which we never endure. It is difficult
to realise that parts of ice-bound Labrador and of Canada, where the
thermometer often drops to 40° below zero, are no farther north than
London and Paris; while Newfoundland lies actually more to the south
than Erin’s green Isle.
Turning to the Pacific Ocean, we find there a corresponding river,
again flowing to the north-east. Just as the Gulf Stream wanders across
the Atlantic, so this river wanders over the Pacific, carrying stores
of tropical warmth to opposite coasts. At its quickest, it is less
rapid than the Gulf Stream, and about three times as wide. It too, as
it journeys, becomes gradually broader, shallower, slower, colder.
This “Kuro Sivo” or “Black Stream,” so named from its dark colour,
flows outside Japan, and then strikes freely for the northern coasts of
North America. And because of its work as a winter heating apparatus
in Alaska, the humming bird is found at a latitude which, on the
other side of the American Continent, means, not the play and whirr
of humming-birds in a soft air, but the disporting of walruses among
ice-floes.
As in the Atlantic, so in the Pacific, the warm northward-travelling
current is balanced by a cold southward-travelling current. The Arctic
stream of the Pacific is not so marked as that of the Atlantic, perhaps
partly because of the much shallower outlet from the Arctic Ocean;
still it is quite chilly enough in its effects upon the Siberian
climate. Here again the cold stream acts as a “wall” to the warm river
flowing the other way.
More reasons than one may help to explain why these two currents slant
off to the eastward instead of pouring due north. The shape of the
various coast-lines has something to do with it; also the presence
of ridges and hollows in the ocean-beds, and the resistance of other
contending currents. A river, either on land or in the sea, will always
travel where it finds least opposition.
One main cause, however, is the whirl of our Earth upon its axis. This,
which greatly affects the directions of prevailing winds, alters also
the lines followed by ocean rivers.
A current starting from near the equator for the north shares in the
rapid rush of the Earth’s surface, which at the equator spins eastward
at a rate of about one thousand miles each hour. As the volume of
water gets farther north, it reaches parts of the Earth which are
whirling more slowly, while it has not lost much of its own eastward
whirl. A sideways flow is the result, changing the northward into a
north-eastward direction.
But a stream starting from the far north for the south is affected in
the opposite way. Near the north pole the Earth’s surface hardly moves
at all; and the southward-flowing current, being weighted with northern
inertia, takes a contrary course to the current flowing north. It lags
more and more _behind_ the faster-revolving surface, and so wanders
westward instead of eastward. Or, if prevented by the land from so
doing, it hugs the coast which hinders it.
So the _pull_ of the two great streams in the Atlantic is exactly
opposed, each to the other. That of the Gulf Stream is towards the
east; that of the Labrador Stream is towards the west; and the resolute
manner in which the two refuse to mingle may be partly due to this fact.
If our Earth could be made to change the present whirl from west
to east, and to revolve instead from east to west, those two great
currents would alter their directions. The Gulf Stream would hug the
American coasts, and the Labrador would find its way over to Europe.
Then the British Isles in winter would know a temperature of 30° or 40°
below zero, and the Canadians would experience soft damp winters and
moderate summers. Perhaps they would no more welcome the exchange than
we should.
Then, too, the Black Stream would cling to the Asiatic side,
transforming the climate of western Siberia, and the cold Arctic river
would put a speedy end to humming-birds in Alaska. But abundance of ice
floes would soon be awaiting the walruses which would have to emigrate
from the other side of the continent.
A good deal of discussion has been held as to whether we do truly owe
our mildness to the Gulf Stream alone, or whether that Gulf Stream is
merely part of a general northward movement of Atlantic waters from the
tropics towards the pole. The question has been warmly contested; and
no doubt on both sides, as generally is the case, truth has been mixed
with error.
The Gulf Stream cannot be viewed as a separate entity. Its very birth
in the Gulf of Mexico depends on a great mass of water ever flowing
from the south-east into the Caribbean Sea. Since so much water pours
in, the same volume must pour out, and as it does so it gains the name
of the “Gulf Stream.”
But after quitting the Gulf of Mexico the stream does not exist alone.
It becomes a leading part of the North Atlantic circulation. The whole
surface of that ocean is slowly turning round and round--“whirling as
if stirred in the direction of the hands of a watch,”[1] and the Gulf
Stream occupies one side or more of the vast _maelström_. In the centre
of this revolving mass of water lies a district where the motion is
slight, and at that centre floats an enormous collection of drift and
sea-weed called the Sargasso Sea.
[1] Dr. H. R. Mill.
Suppose we pour some water in a large basin, drop into it a handful of
small leaves and chips, and make the whole spin gently with one hand.
We shall then see how the chips and leaves will collect at the centre,
and will float there, almost stationary. That is what happens, on a
large scale, in the North Atlantic Ocean.
Other Oceans also have this steady circular movement, not of the whole
body of water, but of the surface-water, down to a greater or less
depth--precisely how deep one cannot say; it lessens gradually with
increasing depth. The same is found also in the South Atlantic, in the
North and South Pacific, and doubtless in the Indian Ocean.
To find its direction in any part, one need only lay a watch, face
upwards, upon a map of the North Atlantic or the North Pacific. In
both cases the water travels round _with_ the watch-hands. In the
South Atlantic and the South Pacific the flow is just in the opposite
direction.
So both the Gulf Stream and the Black Stream are merely parts of a
big oceanic whirlpool. Each ocean on Earth has its own system of
circulation; and that system is part of a world-wide system. The waters
are in perpetual and complicated motion. Streams pour incessantly
hither and thither, to north and south, to east and west.
Two vast streams, known as the Equatorial Currents, nominally pour
round the world, but really are best seen in the open Pacific, where
for long distances no land meddles with their career. They flow
steadily westward, one to the north and one to the south of the equator.
Between them flows a reverse stream, called the “Equatorial Counter
Current.” If a certain amount of water travels north, an equal
quantity must travel south. Or if, as in this case, so much water
runs in a westerly direction, a corresponding amount has to run in an
easterly direction. Water may be marvellously piled up here or there,
by influences of land or of wind, but it cannot remain piled up,
without efforts on the part of the ocean to restore the equilibrium.
Were the whole Earth covered by a single unbroken sheet of water,
these drift currents might circle round and round the globe for ever,
undisturbed in their working. But the Earth has lands as well as
oceans; and when a current strikes a coast its course is altered, part
at least being turned in a fresh direction.
Much discussion has taken place about the causes which bring these
great Drift Currents into being.
Disturbing elements, many in number, may have had a hand in the matter.
So soon as one part of the sea-surface becomes warmer than another
part, movements are set going; the heavy cold water sinks, the light
warm water rises, and streams are started from the one place to the
other. There are also countless rivers pouring into the ocean, each
helping to upset its equilibrium. Heavy downpours of rain raise the
level of the sea here or there, inducing more currents.
But these are lesser causes. It is now recognised, as a fact beyond
question, that the main power in starting and sustaining ocean-currents
is that of Wind.
CHAPTER VII.
OF WIND AND WATER
“He commandeth and raiseth the stormy wind, which lifteth up the waves
thereof.”--PSALM cvii. 20.
“Measure me a measure of wind.”--2 ESDRAS.
Over the great Deep of blue water lies the greater Deep of blue air.
And between these two--the Ocean of Air and the Ocean of Water, both
dragged earthward by the perpetual pull of gravitation--endless
intercourse takes place. Each finds its way in small fragments into the
other. There is always water present in the air. There is always air
present in the water.
Perhaps the latter fact is not so widely recognised as the former; yet
it is equally true. Sea-water contains large supplies of dissolved
gases, absorbed by the ocean-surface from the atmosphere, and passed on
into lower depths, for the use of creatures living there.
But the presence of water in air is known to us all. When we casually
remark, “What a damp day it is!” we mean, “What an amount of water
to-day is in the atmosphere!”
Water-vapour, drawn up from Ocean’s broad bosom, is carried far and
wide “on the wings of the wind,” to fall as rain where needed; and
drying winds in their turn pass over regions where much rain has
fallen, to bear away superfluous moisture.
A good deal was said in the last chapter about oceanic currents; and
mention was made of Winds as their chief cause.
That the power of wind over water is great, anybody may know who
has watched the lashing of the ocean into fury by a gale. But the
degree of that power was scarcely grasped, until within the last
few years. Rivers and streams in the sea were long ascribed to any
cause, except the most weighty of all. No one supposed _the_ immense
current-producing force to be that of Wind--not of mere local breezes
or gales here and there, but of strong constant winds, which prevail
month after month over wide ocean-districts.
When a storm-wind pours up a narrowing gulf, where the sea has no
outlet, it often piles the water up in an extraordinary manner.
Hurricanes have been known to turn the entire Gulf Stream for a while
out of its course, and even to force the waters back so as actually
to reverse the current. Once the volume of water, thus checked by a
terrific gale, was heaped up some thirty feet above the proper level,
which of course caused a fearful deluging of the land.
The above words had not been long written, when papers told us of the
awful hurricane of September, 1900, in U.S. Texas. A deep cyclone
passed over the devoted town of Galveston, the direction of the wind
suddenly changing as the centre of the cyclone went by: and the
heaped-up waters from either side coming together poured their united
volume over the land.
That was a flood which “turned the city into a raging sea.” Buildings
were levelled; houses fell like packs of cards; vessels were carried
miles inland; men and women and children perished by thousands. When
the lessening wind allowed the waters to retire, an inch-deep layer of
slime was found over everything.
Such facts as these help to show how vast is the power of moving air
over the ocean.
As a strong wind blows, the upper layer of water slips along in
obedience to its push; and fresh lower surfaces are bared to the same
influence. Also, the movement of the upper layer tends to drag on
the layer just below, which again affects the one lower still. By
influence thus exerted and passed from one to another, the result of a
long-continued wind-pressure in one direction is to set going powerful
streams, which in the first instance were due chiefly or only to wind.
Round the Earth, where fairly open sea permits them to develop, are
two wide belts of very persistent winds--the Trades--which remain
practically the same all the year round; only shifting their limits
with the changing seasons.
They blow from the north-east and from the south-east slanting towards
the equator. So, speaking roughly, they are easterly winds travelling
towards the west. As a consequence of their steady pressure, we have
the great Equatorial Current of the tropics, pouring from east to west
in two halves, north and south of the equator. This vast ocean-river,
started and kept going by the trade-winds, has been described in the
more important part of its course as a “magnificent surface-current of
hot water, four thousand miles long by four hundred and fifty broad,”
moving “at an average rate of thirty miles a day”--and, it may be
added, at least over six hundred feet in depth.
Between the Trade-wind belts is a belt of dead calms, known to sailors
as “The Doldrums.” This belt divides in two the Equatorial Current; and
in it is found the inevitable “Counter Current,” mentioned earlier,
flowing from west to east.
Another belt of steadfast winds is that of the “Roaring Forties,” in
the Southern Ocean; a wide stretch of all but landless sea, between
40° and 50° south latitude. These “Brave West Winds,” as they are
called, being again the reverse of the easterly Trades, blow all the
year round, and nearly all the world round, since only the southern
extremity of South America interferes with them.
They too give birth to a powerful current, flowing from west to east;
and this mighty stream, almost encircling the Earth, has a mission to
fulfil.
Already it has been said that each lesser ocean in the world has its
own separate circulation-system. This southern stream, with the Roaring
Forties for its parent, has for its especial task to unite all those
smaller systems into one. It has to refuse to the minor oceans a
lonely and self-absorbed policy, and to insist on the great truth of
a world-wide Ocean unity. It has to carry gifts from the Pacific to
the Atlantic, from the Atlantic to the Indian, from the Indian to the
Pacific again. It has to despatch streams northward into more distant
regions, with messages of goodwill to all.
Is this somewhat imaginative? Well, be it so. The facts are
scientifically true. Suggested meanings, gathered therefrom, may be
accepted or rejected, according to the reader’s pleasure.
We see, at all events, that from the vast Drift-Currents of the
Ocean, born of the Winds, spring the Grandchildren of the Winds,
such powerful rivers as the Gulf Stream and the Black Stream; they
in their turn giving birth to an infinite number of lesser currents,
Great-grandchildren of the Winds;--one and all taking their share in a
world-wide circulation of Ocean-waters.
The southern belt of westerly winds, with its resulting westerly
current, would be repeated in the northern hemisphere, but for the
presence of great masses of land. Continents work havoc with schemes of
ocean circulation.
That westerly winds do greatly prevail in corresponding latitudes to
the north is a well-known fact, though we cannot boast the possession
of anything like the “Roaring Forties.” No broad belts of unchanging
air-currents can exist in the neighbourhood of so much land, for the
counter-influences are too many.
From steadfast Wind-belts, giving birth to steadfast Ocean-streams, we
pass naturally to those fitful storms which lash the ocean into passing
passions, and to the uncertain breezes of temperate climes.
There are currents and counter-currents, breezes and contrary breezes,
winds from north and south and east and west, over the whole earth.
Each separate movement of air helps to stir the waters of the sea into
renewed restlessness.
Though few things are more wonderful than those vast rivers of air and
water, pouring always in the same direction, century after century,
they are perhaps less impressive from a man’s point of view than many a
mere whirling eddy, which flings itself along, rousing a huge flurry of
water, and soon dying out of existence. A man cannot grasp as a whole
the Trades or the Roaring Forties, with their companion ocean rivers.
Practically he knows only that little portion of each which happens to
be near his ship. If he is overtaken by a hurricane, the whole life of
which is compressed into a few miles of space and a few hours of time,
he feels a greater awe.
Small wonder that he should. Those impetuous and short-lived eddies
are terrible in their fury. Their winds blow with a fierceness never
approached by the stiffest Trade. A hurricane, tearing over Earth’s
surface at the rate of one hundred and twenty miles an hour, reduces
the most muscular of men to helplessness.
None the less, such a hurricane is in itself a mere accident, a mere
passing incident, a mere swirl of air, coming into being to adjust a
lost balance, and vanishing so soon as its work is done. We have seen
tiny swirls of air dancing along the road, on a windy day, sweeping up
bits of straw or dried leaves into their embrace. Such little swirls
are hurricanes in miniature. The real thing levels forests, wrecks
towns, lashes the ocean into mountainous heights of water, sinks
gallant ships, destroys human lives. Yet the little swirl and the
hurricane are closely akin.
Only in recent years has the circular--more strictly, the oval--shape
of a hurricane become known. It may be described as a revolving eddy
of air, the winds pouring in a corkscrew-like fashion round the
centre, inwards from without, and upwards from within. Another kind of
air-eddy, called an anti-cyclone, gyrates just the other way, downward
and outward. This usually brings light winds and dry weather, instead
of storms and rain.
One might imagine that in the centre of a wild cyclone a ship could
find safety, because there calm reigns. But the furious whirl of winds
all around raises tumultuous billows; and towards the centre, although
the winds themselves die down, the state of the sea is a perfect
“chaos” of tempestuous waves converging from all sides. Sailors strive
their utmost to avoid that central chaos.
CHAPTER VIII.
AN OCEAN OF AZURE
“The boom of the waves on the shingle.”--LEWIS MORRIS.
“Roll on, thou deep and dark-blue Ocean, roll!”--BYRON.
Not that the Ocean is always and everywhere blue. In a certain “arm of
the sea,” the Bristol Channel, it is commonly any tint that you please
rather than blue--brown, green, yellow, chocolate, only not the colour
that we love. If by chance it dons for a few hours a robe of azure,
that robe is merely a passing loan from the sky. And in dull weather it
can only be described as a huge puddle of muddy liquid.
People often grow to like best that to which they are accustomed. A
lady, who had spent most of her life on the borders of that brown
Channel, once assured me that she infinitely preferred it to the “deep
blue sea.” She had been to stay by the latter, and had found its
monotony of tint so uninteresting that she was charmed to get back to
her old friend.
Tastes differ, certainly. Not many would agree with her. Yet it is a
fact that the great Turner went to the Bristol Channel, with all its
mud, for many of his marvellous sea and cloud effects.
“Deeply, darkly, beautifully blue,” sang Byron of the ocean, and he
sang truly, even though the ocean itself, putting aside the Bristol
Channel, is not always and uniformly azure. Near land the tint is often
greenish. Sometimes it is pure green. Often it is a pale and watery
blue. At other times we have a leaden grey. The genuine ocean-blue,
which resembles nothing else on Earth, can seldom be enjoyed till one
gets on really deep water, far from land. Or--till one is looking at
the Mediterranean.
Why should the sea be blue? And why should the sky be blue? For the
matter of that, why should anything be blue? What do we mean by
colour?--whether blue or green, red or yellow?
We mean that particular tint--or sensation--which the object in
question causes us to see--or feel. The object receives sunlight,
and reflects it to our eyes. And since sunlight is white or
yellowish-white, one might expect that everything we look upon would
appear to us white or yellowish-white.
But everything does not. And the reason is that a ray of sunlight is
really a bundle of lesser rays, each of which has its own colour. If
a ray of light is made to pass through a prism, these lesser sub-rays
are spread out upon wall or floor, always in the same order, from
violet at one end to red at the other end. Light is believed to be due
to enormous numbers of most minute wavelets; and for each colour the
wavelets have a definite but different size. They are smallest at the
violet end, and largest at the red end.
Now when a ray of sunlight falls upon anything--leaf or flower, earth
or water--some of the sub-rays are absorbed or taken in, and some are
rejected or refused admission. A healthy leaf, for instance, absorbs
the red, the yellow, the blue, the violet, and refuses the green, which
is therefore thrown back from the leaf-surface to our eyes, making it
green to us. A ripe tomato absorbs the yellow and green, the blue and
violet, and reflects the red. A lump of blacklead absorbs greedily all
the rays, reflecting none, and so to our eyes it is black or without
colour. The petals of a white rose, on the contrary, absorb so little
colour of any kind, that practically the entire ray is sent again to us
as white light.
If this is the manner in which the ocean is blue, it means that
sea-water, and indeed water generally, must in itself be actually blue,
as a cake of ultramarine, a sapphire, a corn-flower, a forget-me-not,
are blue.
Could that be the case? For a long while men decisively answered--No.
Everybody knew that water was colourless, so the idea was flung aside
as impossible. Another explanation came up instead.
The sea is full of fine dust; and it was suggested that, as vast
multitudes of these floating dust-particles are exceedingly small, they
might be able to reflect only the smaller blue light-waves, and not
the larger yellow or the still larger red waves. Thus the sea would
naturally seem to be blue.
After much discussion, careful experiments were made. Different objects
were lowered to various depths, and the effect upon their colouring was
noted. The outcome of these and other tests went far to prove that the
old certainty was wrong, and that water is in itself blue.
Somebody may feel inclined to protest. “Water blue! But that is out of
the question. I have good sight, and I assure you there isn’t the least
sign of colour in water. Not the faintest. If you dip a bucket in the
sea, you will see for yourself.”
Yet all the while the colour may be there, actually existent, though
not to be detected by your eyes or mine in a pailful.
A short time ago I had to buy a piece of lace; and my intention was to
choose a pale straw or deep cream. The lace was wound in many folds
round a large cardboard, and it seemed to be exactly the right hue--a
rich yellow-cream, almost butter colour. Without further demur, I
ordered about a yard to be cut off.
On reaching home, I found myself in possession of a piece of wide
dead-white lace--or all but dead-white. It was actually a very pale
cream; and when a great many folds lay one over another the combined
effect was rich and yellow. But a single thickness of the material
showed no colouring.
The same may be seen with a single piece of very pale blue muslin.
It will appear to be white. But yards upon yards of the same, folded
together, will become quite a deep blue.
A single thin layer of ocean-water, in like manner, has too faint a hue
to be visible to ordinary eyesight. It is only when layers are piled
upon layers that the blue becomes distinct; and the deeper the water,
the deeper generally will be the colour. Some yards of water-thickness
may be said to correspond to a single thickness of lace or muslin.
While, however, we may say with tolerable confidence that the blue
of the ocean is a “True Blue,” this alone will not explain all the
varieties of tinting, seen at different times and in different places.
Sea-water is sometimes a rich profound blue, and sometimes a pale
sickly blue. It is sometimes dull, sometimes brilliant. It is sometimes
green, and sometimes almost black. For these variations, even while
accepting the new explanation, it has been found needful to revert to
the old theory in quest of added help. The sea is blue, because it
really and truly _is_ blue. But that is not all. It is a deeper or less
deep blue, a duller or brighter blue, a greenish blue or even a dull
yellow, because of the vast supplies of dust floating in it.
The Mediterranean was particularly examined, on account of its
remarkable depth and brilliancy of colouring; and it was found to be
exceptionally laden with dust, both fine and coarse, brought from land
by innumerable rivers, and also pounded by breaking waves on the long
surrounding coast-lines.
Such floating particles, at all events the bigger ones, are no longer
supposed, as once they were, to reflect only the tiny blue light-waves.
On the contrary, they are believed to reflect all the waves of light
indiscriminately, whether large or small; while the sea, by virtue of
its own power as a Blue material, captures all those reflected waves
except the blue, and allows the latter alone to reach our eyes.
Near British shores the water has often a strongly green tint; and this
may be due in part to floating particles of sand. The yellow of the
sand, combining with the blue of the water, would naturally form green.
Possibly also the sea, near shore, is sometimes affected in colour by
floating sea-weeds, green-tinted.
The blue of the sky is often reflected on the sea-surface, and
sometimes so powerfully as to overcome the real ocean-colour. One
hardly understands how intense such a sky-reflection may be, until one
has watched the whole sea transformed into glowing crimson or gold from
a radiant sunset.
Much the same perplexity has been felt about the blue colour of air,
as about the blue colour of the ocean; and much the same course of
explanation has been followed. Its blueness was long maintained to be
due only or mainly to the “scattering of sunlight” by infinite numbers
of floating dust-specks, which also serve to account for the golden
and crimson tints of sunset. It now appears that oxygen, an important
element in the atmosphere, has a faint blue tint of its own, like
water, which at least helps to answer for the blue of the air.
We may therefore say of Water that it is believed to be transparently
and intrinsically blue; and that its colour, though not actually due to
floating specks of dust and other impurities, is a good deal affected
by them. Such materials in the Ocean help to modify its colouring,
sometimes deepening it, sometimes adding to its brilliance, sometimes
deadening its brightness, sometimes turning it green or yellow.
Careful observation has also shown that, when water is especially free
from dust-specks, it is of a darker and duller hue than when they are
present in large quantities to capture and reflect the sunbeams.
CHAPTER IX.
ICE-NEEDLES TO ICE-MOUNTAINS
“In all time,
Calm or convulsed,--in breeze or gale or storm,
Icing the pole, or in the torrid clime
Dark-heaving;--boundless, endless, and sublime--
The image of Eternity,--the throne
Of the Invisible.”--BYRON.
So far most of our thoughts have been given to Earth’s milder regions;
where, indeed, the warm ocean water is at best but a thin slice laid
over vast depths of cold water, yet where, so far as man is concerned,
heat has the upper hand. In other parts, far to north and south, the
Reign of Frost is a dire reality; and that chill monarch “rules the
roost” in a masterful fashion, lording it over land and sea for months
together, with none to resist his sway.
Wherever King Frost waves his sceptre, one result always follows. Water
changes from a liquid to a solid.
Nor is water the only liquid which so changes. Quicksilver, known to
us usually as a liquid, may be frozen, though not without a greater
amount of cold than that which freezes water. Then, again, molten
iron--that is, iron made soft through great heat--is a liquid which
when cold hardens into a solid. Iron as we most often see it is simply
in its frozen state; just as much the frozen form of iron as ice is the
frozen form of water.
And the freezing of the two comes about in the same mode. As molten
iron cools and hardens it crystallizes. Minute needles, far too minute
to be seen, take shape, crossing and re-crossing at various angles,
till the whole becomes a solid mass of interlaced iron needles, held
in position by attraction. When water changes into ice, the same thing
happens. The water-particles shape themselves into tiny needles, and
these ice-needles cross and re-cross, till they are knitted into a
compact mass, something like the mass of iron needles.
Nor are needles alone found in ice. Exquisite forms resembling
ice-flowers are there also, commonly invisible, but composed of
ice-needles woven into various shapes, which again are woven into the
fabric of the solid ice. So a block of ice may perhaps be said to be
formed of ice-flowers, and the ice-flowers to be formed of ice-needles.
Such flowers are of many shapes, but more generally they have six
petals each. If a ray of sunlight is thrown upon a slab of ice, through
a lens, so as to concentrate the heat, then, as the ice melts, the
sparkling of these tiny florets can be seen; and when their magnified
image is cast upon a sheet, the six-petalled flowers become clearly
visible.
Even more beautiful than the ice-flowers embedded in solid ice are the
ice-flowers embedded in snow. They too are made of tiny spicules or
needles of ice; and they too, while varying much in shape, are commonly
six-petalled.
Solid blocks of ice are at first sight so unlike masses of feathery
snow that a child would be surprised to hear a snowflake spoken of
as “ice.” Yet the difference between the two lies mainly in the
arrangement of the little ice-needles, in the way they are put
together. Those of hard ice are more densely packed; those of snow are
more loosely joined, with open spaces between, full of air. It is the
abundance of air, mixed in with ice-needles, catching and reflecting
light, which gives to snow its whiteness.
In some cases, however, as with glacier-ice, the texture is so
close--like that of glass--that neither flowers nor needles are
discernible.
The fact that snow may be, through hard pressure, actually transformed
into firm ice--and this is an everyday occurrence in the high
Alps--shows how closely akin the two are.
Every country in the world has, at a certain height, that which is
called “the line of perpetual snow,” or, more briefly, “the snow-line.”
Below that limit snow may fall in winter, and water may freeze, but
both vanish in the summer. Above that limit snow and ice are found all
the year round, lessening to some extent in summer months, but never
disappearing.
Over the equator the snow-line is about sixteen thousand feet high, or
higher than Mont Blanc; so if Mont Blanc were situated on the equator
it would not be a snow-clad mountain. At the north and south poles
the snow-line is down at the sea-level. Summer warmth there does not
suffice to get rid of winter ice and snow. Between the equator and the
poles the snow-line varies in each country, according to that country’s
position and climate.
Above the snow-line on lofty Swiss mountains heavy falls add
perpetually to the mass of snow. During the summer a certain degree of
thawing goes on, but never anything like enough to balance the wintry
additions. Exactly at the snow-line the quantity of snow which falls
and the quantity which thaws in the year are about equal. Lower down
the yearly thawing exceeds the yearly snowfall.
But if, above that line, more snow is being added year by year than
can thaw and flow away, must it not be that those mountains which wear
perpetual snow are always growing higher?
It certainly would be so _if_ the snow heaped upon those summits had no
other outlet, no other means of escape to the Ocean--the goal of all
Earth’s waters. But another mode of escape is found. Superabundant snow
on mountain heights gets away by means of glaciers.
We have had to think about liquid rivers flowing in the ocean, and here
are solid rivers flowing on the land. Liquid rivers with liquid banks;
solid rivers with solid banks. A curious anomaly in either case.
The higher levels of land are drained by rivers pouring down to lower
levels and thence into the sea; and it is the same with the mighty
snowfields of Switzerland as with any gentle range of English hills,
only here we have rivers of ice instead of rivers of water.
But why not rivers of snow, if a glacier means the draining away of
snowfields?
Well, so they are--rivers of snow. But the heavy weight of overlying
snow above, and the great pressure of descending masses later, welds
the light and delicate snow into hard ice. Those tiny needles, of which
the falling snow was made, are crushed closer and closer, till they
form a solid block, which loses all resemblance to snow. In summer the
melting of the surface by day, and its freezing again by night, help
forward this transformation.
Thus a glacier is literally an Ice-River, a huge long tongue of ice,
squeezed from beneath snowfields, and creeping down a valley.
Such rivers vary much in size. Some of the Swiss glaciers are between
twenty and thirty miles long, in parts two or three miles wide,
and often hundreds of feet deep. Starting above the snow-line they
sometimes reach thousands of feet below it, the milder air failing to
end their existence sooner. So enormous are the ice-masses, that not
all the strength of the summer sun can make away with them. Of course,
each square yard in turn does melt, and does help to feed the river of
water which rushes away from the lower end of the glacier--sooner or
later to reach the ocean.
Switzerland’s grandest glaciers dwindle into insignificance beside the
enormous ice-rivers of the frozen north. When the “Humboldt Glacier”
of Greenland gets to the ocean it is about forty-five miles in width.
A generous gift of water indeed, from land to ocean. Another monster
glacier ends in a cliff of solid ice, rising in parts to four hundred
feet of height. Greenland lies under one unbroken shield of snow and
ice; and the weight of this tremendous “ice-cap” presses out numberless
rivers of ice from its shores into the sea.
These do not, like Alpine glaciers, end in rivers of water, flowing
through milder climates to the ocean. The Greenland glaciers themselves
reach the sea, each thrusting an enormous “foot” far into deep water.
For a while, as it does so, the glacier-ice holds firmly together in
a solid mass, gliding slowly over the ocean-bed, getting deeper and
deeper, till only a small part of it shows above the surface.
But ice naturally floats. The upward pressure of the sea becomes
increasingly great, fighting against the tenacity of the ice, and in
the end old Ocean has the best of the contest. A huge mass of ice
snaps off from the glacier-foot and springs to the surface, making the
waters seethe and swirl with the shock, and sending heavy waves in all
directions. Then the buoyant mass floats away as a newly made Iceberg.
Some Icebergs, broken thus from a Greenland glacier, are two or three
hundred feet high. That is to say, a sailor on board a ship can see two
or three hundred feet of solid ice above the surface of the sea. But
this is by no means the true iceberg height.
When we talk of ice “floating,” we do not mean that the whole piece of
ice rests upon the top of the water. It floats _in_ the water. Only
about one-eighth of it is visible above, and the other seven-eighths
are hidden below. So in the case of an iceberg rising two or three
hundred feet above the sea, we may be sure that at least seven times as
much ice is underneath the ocean-surface. This shows what an enormous
mass the whole of a floating ice-mountain must be.
[Illustration: AN ICEBERG, SHOWING THE SECTION UNDER WATER
For every cubic foot of ice above water there are seven cubic feet below
_Face page 86_
]
No wonder that a certain iceberg, which held its head one hundred and
fifty feet high, should have run aground in water five hundred feet
deep! No wonder, either, that when two such bergs come together,
and an unfortunate ship happens to lie between, it should be smashed
like an egg-shell. In Baffin’s Bay Dr. Kane once counted a pack of two
hundred and eighty bergs, most of them being between two and three
hundred feet high.
The “birth” of such oceanic hills has been watched by travellers, at
the moment of their breaking off from a glacier-foot, with no small
interest, and also with no small danger, if they chanced to be within
reach of the terrific billows started by such an event.
Sometimes icebergs come into existence differently. If the glacier
comes to an end, not in but above the sea, the mass breaks off above
with its own weight, and plunges downward, to float away on its new
career. This was lately witnessed in far southern seas, and the
travellers barely escaped with their lives, so tremendous was the rush
of the ocean-wave following the plunge of the new mountain.
A great deal of carrying work is done by icebergs. Many and many a
block of stone or rock--not to speak of supplies of gravel and sand and
mud--is borne by them to mid-ocean, and there dropped. In the Atlantic
they seldom get further south than the neighbourhood of Newfoundland.
As they journey, they slowly weep and trickle out of existence.
In the Antarctic both glaciers and icebergs are abundant. The northern
bergs are generally higher and more sharply peaked; the southern bergs
of a flatter shape, but much larger and of a deeper blue.
Sea-water does not freeze so quickly as fresh water. On account of
the salt which it contains, it does not become solid until it is four
degrees colder than fresh water needs to be. The freezing-point of
fresh water is 32° F.; that of salt water is 28° F. As ocean-water
freezes, most of the salt is separated from it; and the ice formed is
practically fresh, though often it holds unfrozen salt water in tiny
hollows.
CHAPTER X.
RECEIVING--TO GIVE AGAIN
“O end to which our currents tend,
Inevitable Sea!”--A. H. CLOUGH.
“All the rivers run into the sea; yet the sea is not full.”
So wrote the wisest of men, long centuries ago; and the words are true
in a world-wide sense, which the writer with all his wisdom could not
then have fully grasped.
“All the rivers” meant to him a great many streams, large and small, in
southern Asia, and in southern Europe, with some in northern Africa.
“All the rivers” of the world _now_---- Let us see what it means.
The chief work of a river is to drain the land; to bear superfluous
waters into the great deep. Water lying stagnant on land becomes
harmful. Immense supplies are perpetually needed; but it must be fresh
water, clear water, running water, water newly fallen from the skies,
or newly received from ever fresh because ever renewed springs. Never
stagnant water.
So Earth’s rivers--we are talking of land-rivers now--gathering to
themselves the multitude of lesser streams and tributaries, which in
their turn have been earlier fed by an infinite number of burns and
runnels in country and town, hurry downward to the Ocean, with rich
presents from the Land. But all the while, Land expects “to receive as
much again.”
When we stand beside a broad river, watching the steady flow, hearing
the little murmurs of sound and the soft suck and “swish” against the
banks, we do not often realise the greatness of the task which that
river may have in hand.
Suppose we are on the banks of the Seine, the mother-stream of gay
Paris. Many a century has Paris lived; but the Seine existed countless
centuries before Paris was ever heard of. Year by year the Seine drains
away surplus water from some twenty-three thousand square miles of
French territory. Year by year the Seine carries down to the Ocean a
gift of more than five cubic miles of water. Five hundred cubic miles
in the course of a century!
Or suppose we turn to the Rhine, that river of castles and legends,
which starts with the meltings of over one hundred and fifty glaciers,
and is said to be fed in its course by something like twelve thousand
lesser streams. The Rhine drains, at the very least, between thirty
and forty thousand square miles of country; and it pays to the Ocean
an annual tribute of more than ten cubic miles of water. More than a
thousand cubic miles each hundred years.
Let us take a look at the Yangtsekiang--a Chinese river of special
interest for British trade. It drains over six hundred and fifty
thousand square miles of land; and each year it hands over to the Ocean
more than one hundred and twenty-five cubic miles of water.
See the Mississippi. More than a million square miles of American
territory are drained by it; and its annual gift to the Ocean amounts,
like that of the great Chinese river, to over one hundred and
twenty-five cubic miles of water.
Or once more--take the Amazon. By that mighty stream more than two
million square miles of land are drained; and more than five hundred
cubic miles of water are poured annually into the sea. So the Amazon
presents to the Ocean in the course of a year what the Seine presents
in the course of a century.
It has been reckoned that “all the rivers” of Earth combined pour
every year into the sea a mass of water equal to about six thousand
five hundred cubic miles. This would suffice to fill a vast tank, one
mile broad, one mile deep, reaching the whole way from the north of
Scotland to the south of Africa.
“All the rivers run into the sea; yet the sea is not full.” It does not
overflow its limits. And long ago as King Solomon wrote these words, he
was able to give the reason. “_Unto the place from whence the rivers
come, thither they return again._”
The ocean receives these generous gifts from the land, only to be
generous in return. That which the ocean freely accepts she gives
again, lavishly and royally. Enormous supplies of water are needed on
land, and it is the work of the ocean to meet that need.
Throughout the world, and especially within the tropics, a constant
drying up of the sea-surface is going on. This passing away of visible
water out of sight is, like countless other everyday events, very
extraordinary; though we think nothing of it because of its familiarity.
A tumbler of water is spilt upon a boarded floor. “Oh, never mind,”
says a careless voice. “It will soon dry up.” Yes, of course it will;
and who troubles himself to think what the “drying up” means? Particle
by particle the spilt water will creep softly away, not as a liquid but
as a vapour, into the atmosphere, there to float, hidden from sight,
and to be carried hither and thither wherever the air may be moving.
Had such a thing never been seen before, it would arouse the wonderment
of every thoughtful mind in Europe. But miracles of daily occurrence
cease to be miracles.
Some few solids, such as camphor, have the same property of passing
slowly out of sight into the air, though it is a much slower process
with camphor than with water. Snow and ice also, when there is no thaw,
dry off gradually. I have known a whole slight fall of snow disappear
thus, without any thaw.
Vapour is always present in the air; sometimes a large amount, as much
as the atmosphere is able at that particular temperature to hold;
sometimes a less amount, not so much as the air could contain. In the
latter case “drying” goes on briskly; in the former case it languishes,
and wet clothes, wet pavements, remain long damp.
Warm air can hide away a much more abundant supply of vapour than cold
air; so the hotter and drier the air, the quicker is the evaporation
or drying-up of water-surfaces. This is remarkably seen in the Red
Sea. An amount of water passes away from that sea in a single year,
sufficient to bring down its level some fifteen or twenty feet,--which
it would do, but for a powerful current always flowing in from the
Indian Ocean.
When sea-water thus passes off in vapour, it leaves the salt behind.
Were this amount of evaporation to go on steadily in the Red Sea,
without any fresh supplies of water being received, about two thousand
years would suffice to dry up the whole Sea, nothing but a great mass
of salt remaining in its bed.
If the Red Sea alone loses in one year a slice of water, fifteen or
twenty feet thick, imagine what the enormous quantity must be which is
raised, year by year, from the surfaces of all tropical oceans, and in
a less degree from the seas in colder regions. The weight of the whole
could only be told in hundreds of millions of millions of tons. And
this vast mass is drawn up, gently and mildly, particle by particle; to
be wafted by breezes to regions where water is urgently required, and
there to be poured down as rain upon the thirsty ground. Thus the great
exchange is carried on, with steady sequence, between Land and Ocean,
Ocean and Land.
When showers come to gladden the hearts of our farmers, and to provide
food for the people, they might sometimes give a thought to the
Ocean--to the manner in which, with Sun and Air as helpers, he sends
aloft millions of tons of water, for the use of those on land.
For “unto the place from whence the rivers come, thither they return
again.”
There are parts of the world where rains, like winds, come at regular
and almost unfailing dates. In disappointing years, when they fail, an
Empire may be disorganised in consequence.
But in our British Isles no such regularity has sway; and a pleasing
uncertainty prevails about Weather in general. This gives scope for
something to talk about, and something to grumble at. What the average
Briton would do without these perpetual possibilities is a serious
question.
No doubt our Weather _is_ a very uncertain quantity to be reckoned
with. Yet it may be that we are unfair to our friend the Ocean, who
does so much for us in the weather-line--ever at work as he is, night
and day, sending upward supplies of water, bringing to our shore stores
of tropical heat, softening the westerly breezes which excel.
Is English weather really so bad as is popularly supposed? There are
climates and climates in the world; some worse, some better. May it not
be that ours really is, in many respects, not worse but better? Perhaps
a slight digression here will be pardoned, for the sake of Old Ocean’s
good name, in his dealings with the British Isles.
Foggy days, dull and damp days, are apt to make a more lasting
impression upon some people’s memories than sunny days. One reason for
the generally mournful idea of British weather may be due to the fact
that foreigners, Frenchmen especially, are by nature more light-hearted
than Englishmen, and that they keep chiefly in mind their sunny days,
while we perhaps keep chiefly in mind our dull days.
To gain a fair estimate of average British weather, long and careful
observation is necessary. There is absolutely no safe criterion, save
that of record-keeping. Not many people have the perseverance to do
this for any length of time, and few non-scientific people have the
fairness of mind and judgment to do it dependably.
It is in my power to tell of a record which has been kept, steadily,
carefully, perseveringly, by an English lady during many years, and
to give the results at which she arrived. Without being strictly
scientific she was--I have to say “was,” since she has passed from our
midst--accurate, regular, conscientious, and fair-minded. For all this
I can vouch from personal knowledge. At the same time that she kept
records of the weather, she registered day by day the readings of her
thermometer and the daily amount of rainfall. With the two latter we
are not now concerned.
Her method as to weather-registration was as follows. Four marks were
used: =X= for a thoroughly fine day; =V= for a day in which fine and
dull mingled, but in which the fine predominated; =I= for a day in
which again the two mingled, but in which the dull or rain had the
best of the matter; and =O= for a day which could only be described as
decidedly bad.
Of course many days occur which it is difficult to assign to either
class, especially of the two middle divisions. But a constant endeavour
was made to keep a fair proportion. If one doubtful day were placed,
for instance, in the =V= division, the next equally doubtful day would
be carefully placed in the =I= division, to ensure accuracy.
At the end of each month all these four classes were added up
separately. Also, to simplify results, the Good and the Half-good, the
Bad and the Half-bad, were classed in two columns as comprehensively
Good and Bad. From these two columns curious results were obtained.
It should be stated that the lady in question lived at Reigate, and was
seldom absent from home, never more than for a few weeks at a time.
The record is thus mainly of one place. Now and again a short absence
occurred, and her observations were then carried on wherever she might
be; but the absences were so few and generally so short as to be
unimportant.
Before going farther, it is worth while for the reader to ask himself,
perhaps also to ask one or two friends, what might be the proportions
of “Good” and “Bad” days that he or they would expect to find in the
English climate, as the result of such a computation?
Would it be three-quarters bad and one-quarter good? Or could it be
possibly half bad and half good?
Here is the actual result:--
A.D. Bad Days. Good Days.
1886 89 276
1887 59 306
1888 85 280
1889 107 258
1890 85 280
1891 91 274
1892 77 288
1893 71 294
1894 109 242
1895 88 277
1896 86 282
If the second column be added up, the sum-total amounts to three
thousand and fifty-seven days. If the first column be also added up,
the sum-total amounts to nine hundred and forty-seven days. A very
simple calculation, which anybody may work out, will show that the
proportion of “Good” days towards “Bad” days is that of about Three to
One.
Who would have thought it? Not certainly the majority of friends to
whom I have appealed for an opinion. Not even an able scientific man,
who frankly confessed his astonishment.
Over three-quarters of fairly Good Weather, as opposed to under
one-quarter of fairly Bad Weather--and this the average of eleven
years! Have we not given the rein too freely to our National grumbling
tendencies? Would it not be better if we thought more of the sunshine,
less of the clouds and rain?
It may perhaps be of interest to some to know more exactly the
proportions of the four classes during those years. Both in these and
in the former columns it will be noted that one year of the eleven is
a few days short of the full length--the year 1894. This seems to have
been the only lapse in regularity.
Here is the fuller statement:--
A.D. Bad. Half-bad. Half-good. Good.
1886 15 74 86 190
1887 16 43 116 190
1888 18 67 110 171
1889 12 95 113 145
1890 19 66 110 170
1891 21 70 107 167
1892 17 60 95 193
1893 17 54 87 207
1894 19 90 106 136
1895 19 69 84 193
1896 22 64 115 165
So if we owe our weather to the Ocean’s influences, it appears that we
have more to be thankful for than to complain of.
King Charles II., wise in word though not in deed, is reported to have
said that in England a man could work more days in the open air than in
any other country. Whether this be so or not, it at least shows that
the Merry Monarch was not one in the army of weather-complainers.
CHAPTER XI.
A STORY OF CONFLICT
“Thou Sea, who wast to me a prophet deep,
Through all thy restless waves and wasting shores,
Of silent labour and eternal change.”--KINGSLEY.
Between Land and Ocean a ceaseless contest is carried on.
The land is always endeavouring to keep its present state unchanged.
The ocean is ever trying to tear down and demolish the land. Yet the
very object of the ocean in so doing seems to be that new land may be
raised up with the stolen materials.
There are Continents and Islands, moulded long ago, which we see as
finished structures, that have reached the meridian of their existence
and entered upon their decadence. With many of these Ocean’s efforts
are chiefly employed for destruction. Indeed, in all cases, the power
which once erected an island or a continent is at work upon it still,
not always and only for destruction, but sometimes for modification,
altering its shape, making it larger or smaller, rounding a curve here,
adding a protuberance there, giving finishing touches, and in the end,
if not from the beginning, acting also as spoliator.
But the work of building has not ceased; it never does cease. Through
the ages it has gone on, and it goes on yet. There are embryo islands,
perhaps embryo continents, being now slowly fashioned in Ocean’s
workshops, not ready for use.
A great part of the work of land-building takes place in darkness. It
is carried on, not merely from day to day, but from century to century,
never hasting, never pausing. The materials are brought often from
far distances, not by men, but by streams, by rivers, by glaciers, by
ocean-waters; and the weight of those waters helps to weld the gathered
materials into a solid whole.
Anybody who watches the results of even one heavy downpour of rain on
land may gain some notion of what is going on everywhere.
If your house has a soft-water tank, you can hardly have failed to note
how black the water becomes, after a pelting shower, following upon a
drought.
No wonder, for the rain has washed the roof, and has carried off a
supply of collected dust and soot. Not the roofs of houses alone, but
the streets, the walls, the pavements, in a town--the trees, hedges,
grass, roads, in the country--are all relieved of dusty layers, while,
if the rain be heavy enough, sand and soil also are swept away.
Sometimes they are only taken to a lower level in the same
neighbourhood, but large quantities find their way into the drains or
streamlets, which join bigger brooks, and thus reach the nearest river,
finally joining the sea.
Any moving stream is able to carry along floating materials, which
in still water would sink to the bottom. The faster the current the
heavier is the weight which it can support. A mountain torrent conveys
pebbles, grinding them to a smaller size as it rushes along; and some
of the more powerful torrents transport even great stones.
If one is sceptical about this lifting power of water, and if one
cannot go to the mountains to see for oneself, the next best thing is
to watch the breaking of waves upon a shingly beach. The pebbles in
rough weather are caught up and whirled about like grains of sand;
and after a severe gale the whole look of a beach is often completely
changed. The shingle may have been piled to an unusual height, or it
may have been borne away. So it is easy to recognise that water has no
mean carrying strength.
In the last chapter we saw what huge gifts of water are handed over,
year by year, from the Land to the Ocean. But the Rivers, acting as
handmaidens to carry these offerings, do not bestow water only. The
water-gifts are laden with solid materials, to be used for building
purposes.
A river tears earth and sand from its own banks, and wears down the
stones and rocks in its bed; and to this growing collection, as it
flows, it adds contributions of earth and sand, brought from higher
reaches by its tributary streams. Most of those materials are kept
afloat.
To make sure that they are so, we only have to examine the mouth of a
river. Floating mud and sand may not be apparent in the river itself;
but just where the river joins the sea, just where the outflowing
stream encounters the inflowing ocean-tides, a bank or banks of mud and
sand may be seen. These are a common feature of river-mouths.
Many a larger river has at its mouth an enormous network of banks,
divided by streams, and the whole is described as the “delta” of that
river; its shape being roughly like the Greek letter “delta,” or like
an opened fan. Everybody has heard of the Delta of the Nile, the Delta
of the Ganges, the Delta of the Mississippi. But hardly a river exists,
no matter how small, which on joining the sea does not make its own
little delta.
And the formation of these deltas comes about in a very simple manner.
So long as a river flows onward, at a fair pace, it is able to hold
up its floating materials, to keep the earth and sand in its embrace
from sinking to the bottom. But when it reaches the sea, its progress
is checked; and no sooner does it slacken speed, than some of its
buoyed-up materials begin to sink. The heavier kinds are the first to
touch bottom, getting piled up so as to form a bar or bank; and farther
out, as the stream grows yet more slow, lighter substances find their
way downward, making another bank.
In fact, the river, with Ocean’s help, is busily building Land,
forming an island or a group of islands, either of pebbles or sand or
mud. In the case of a great river such islands are often very extensive.
The flow of a small river is quickly stopped by the sea, but such
powerful streams as the Ganges or the Nile pour onward for many many
miles, before they begin to mingle with the salt water, their speed
slackening gradually. Not only do they form great deltas of islands,
but they carry vast supplies of material far into the ocean.
Recently an examination was made into the waters of nineteen important
rivers, to discover what quantity of material was carried by each. The
result of this examination was somewhat startling.
We have seen already how many cubic miles of water a river may give
over yearly to the great deep. It was found that, on an average, these
rivers may be reckoned to give over also, _with each cubic mile of
water_, more than _seven hundred and sixty thousand tons of material_,
torn from the land. These enormous collections, together with vast
quantities which the waves have dug and wrenched from beaches and
cliffs, are dropped to Ocean’s floor.
Not indeed generally to her deepest parts. So far as we yet know, the
Ocean does not build continents in those black profound abysses, miles
deep, flat-floored, calm, unchangeable. No traces have been there
discovered of such strata as form the Continental parts of Earth’s
Crust. Ocean’s main work, as builder, goes on in “The Transitional
Area;” and most so in that part of it which is called “The Continental
Shelf,” where the depth does not exceed about six hundred feet.
“Transitional” regions are so named because it is believed that some of
them may once have been Continents, that others of them may yet become
Continents. There was a time, in the long past, when ocean-waters
flowed over all those parts of Earth which now are known to us as
dry land. There may be a time, in the far future, when areas of
comparatively shallow water will become dry land.
Through ages the task of taking materials from the land for building
purposes has been carried on by the Ocean, and it goes on still. The
Continents are being steadily worn away; the Islands are becoming
continually smaller.
Were this to continue always, with no counteracting forces, islands
and continents must in the end disappear. It would take a very long
time; probably well over six millions of years, at the present rate of
demolition. Still, however long deferred, the end would be sure.
But counteracting forces exist.
CHAPTER XII.
ABOUT THE LONG PAST
“The cold and silent past.”--WHITTIER.
“Thou coveredst it with the Deep as with a garment; the waters stood
above the mountains.”--Ps. civ. 6.
The very long past--how long no man can say. Some rash attempts have
been made to name the numbers of thousands of years which may have
elapsed since this or that particular stage in the world’s geological
history. Such reckonings can possess little or no true value. It is
better to confess frankly that we cannot fix dates. We only know that
certain changes did come about--very long ago.
Our Earth has not always been as she is now. She has altered greatly.
She is altering still. Development has gone on through the ages.
Development goes on still.
Continents and parts of Ocean have, so to speak, changed places.
Mountains have risen; and tablelands, high uplifted, have sunk low.
Sea-beds have become dry land; and dry lands have become sea-beds.
Rivers have carved new paths for themselves; and cataracts have worn
away vast masses of rock, carrying the débris to the sea. Ocean-waves
have battered down lines of cliffs, and new cliffs have emerged from
under water. All these things have come about, not in a few years, but
in hundreds of years, in thousands of years, some say in millions of
years.
Such time-possibilities are not, however, without limits. Sooner or
later the Astronomer steps in with a--“Hold! Enough! The Sun as a light
and heat giver could not have existed then.”
But we may leave such perplexing comparisons and calculations, and may
content ourselves with a general--“Very long since!”
There was a time when men believed our Earth to be at rest, in the
centre of a revolving Universe. That notion had to be given up as
knowledge grew. There was a time, far more recent, when we all felt
confident that this firm ground, on which we live and move, stand and
work, was solidly calm and immovable. That notion too has had to be
abandoned.
For the Earth-crust itself is in motion; certainly in parts; probably
as a whole. Here it is gently heaving upward; there it is slowly
sinking downward. True, we do not see or feel such movements. But
neither do we feel the whirl of our Earth upon her axis, or her rush
around the sun. Neither do we see from hour to hour the growing of a
boy into a man, or the change from a sapling into a tree.
Straight through from side to side, the Earth measures some eight
thousand miles; and of those eight thousand a very slight “skin” is all
that we can study, by anything approaching to direct observation. No
wells or mines on land can be sunk so deep as the sailor’s plumbline
in the ocean. If we add the six miles or more of the ocean’s greater
depths to the five miles or more of Earth’s higher mountains, we have
at most twelve miles, which, compared with the whole diameter of the
Earth, must be looked upon as a mere nothing.
By one means we are able to learn something of what lies deeper in the
earth-crust.
Half a dozen deep wells may be sunk in different places, the same
boring apparatus being used, and the same methods being followed. But
the same results would not be obtained. Earth’s crust is not one solid
continuous substance, like a shell of iron. It is made up of different
substances, lying one upon another, or mixed confusedly together. When
men work their way downwards, in well-sinking or in mine-sinking, they
come across a great variety of layers, each unlike the rest.
Here perhaps is a stratum of stiff clay, and there is a deposit of
sandstone. Here hard granite bars the path, and there an easy road
is found through crumbling chalk. Here a great thickness of pebbles
appears, bound together into a rock-like conglomerate; and there seams
of coal alternate with limestone.
Each whispers a tale of Earth’s past history; and not the same tale.
They were not all made in the same workshop, or after the same mode.
Each has its own separate biography.
And the various layers do not lie flat and even, one upon another. Once
upon a time they may so have lain, but since those days they have been
moved and shoved about, tilted and lowered, heaved up and dragged down,
so that some of the upper layers have in places disappeared below the
pile, and in other places some of the undermost layers have been pushed
to the top. It is by studying the latter, where they happen to crop
up within reach, that the geologist can learn a little about deeper
portions of the earth-crust and about the rocks of which it is made.
By that word “rock” must be understood, not only such hard kinds as
granite and marble, but softer materials, such as chalks, clays, sands,
and even muds.
Rocks generally have been roughly divided into two classes--the
Stratified and the Unstratified.
Stratified Rocks, known also as Sedimentary, have been put together in
the past, grain by grain, layer by layer, under water, built gradually
through ages, and slowly welded into firmness.
Unstratified Rocks, known also as Igneous, from the Latin word for
“fire,” have been melted down by great heat into a liquid state, and
have then cooled into solid crystallized masses.
When these fire-made rocks have been heaved up from lower depths and
are exposed to the wearing effects of rain and wind, rivers and waves,
they too have to part with much of their material, like stratified
rocks, only more slowly, owing to their harder make. These materials
are carried seaward, to be used in the building of fresh stratified
rocks. Then again, some kinds of stratified rocks, when exposed
to intense heat, will crystallize into igneous rocks. So the one
kind may be the child of the other; and many rocks partake of the
characteristics of both.
With regard to the wearing away of rocks, the destruction of land by
water, it was said in the close of the last chapter that, but for
certain “counteracting forces,” the whole of the Continents might in
the course of ages be slowly carried off by the Ocean, and be buried in
the mighty deep.
This sounds like what, in modern parlance, may be termed “a very large
order.” Who could imagine a feeble substance like water having any
effect upon massive granite cliffs?
Few people grasp the tremendous battering force of ocean-waves upon
a rocky coast, and fewer still realise the wasting power of running
rivers, or of endless successions of raindrops.
Here is a fact as to the strength of ocean-waves. Some of us may have
watched the majestic ground-swell which beats upon the western coast
of Scotland. It is said that, upon a rough average, taking smooth and
tempestuous weather together, each summer wave that breaks upon that
shore from the Atlantic does so with a force of over six hundred pounds
upon the square foot. For winter months alone, when gales have sway,
the average blow rises to about one ton; and some mighty billows are
known to batter with a weight of three tons.
Such a fierce assault as this, continued through thousands of years,
might well in time wear away the hardest rocks, demolish the loftiest
cliffs.
A counteracting force, however, exists, and has already been named.
Our earth-crust is in motion. Parts of it are sinking, and in those
regions the ocean has the best of the contest; for fight as man may,
raise walls and bulwarks and breakwaters as he will, he can but retard
the inevitable. If the sinking continue, no matter how sluggishly, he
must in the end be beaten, and the persistent sea will encroach upon
the land’s domain. But many coasts are slowly rising, slowly lifting
themselves out of the sea, slowly shaking themselves free from Ocean’s
dominion; and in those regions, no less inevitably, the action of the
sea is thwarted.
As to the why and the wherefore of such Crust-movements, science
suggests explanations.
Once upon a time, long ago, our Earth was a glowing molten mass. Since
that period it has been cooling, and it is cooling still. Many facts
point to the great probability of a still molten centre.
Not only do we find volcanoes scattered over the Earth, on land and
under the ocean; but numberless hot-water springs exist, some of them
a thousand miles away from any known volcano. Then again, when deep
mining or boring operations take place, it is noted that the degree of
warmth for a while corresponds to the state of the weather above, but
that beyond the limits of seasonal change the temperature rises with
increase of depth. This looks like greater heat below.
Many scientists have held strongly that, as above suggested, the whole
inside of our Earth is so far heated as to be in a molten condition,
contained within a cool hard crust, which may be from twenty to fifty
miles in thickness.
Others have maintained that the said crust cannot be less than two
thousand miles thick, with a small molten core.
Others believe that the entire Earth is actually solid throughout; the
outer parts from coolness; the inner parts from great pressure.
Again, a theory has been started of a solid centre and a solid crust,
with an intervening “fire-sea” of molten rocks; and another of a
gaseous inner globe, surrounded first by molten layers, then by a firm
inclosing crust.
All these different explanations rest upon one foundation--that of a
steadily cooling Earth--that of a more or less heated interior, and of
a hardened crust.
The cooling of the inside goes on slowly, and not uniformly, since
conditions differ in different places. As the heated materials become
cooler they lessen in size. Thus the nucleus is constantly getting a
little too small for the inclosing crust.
If the said crust were a solid shell, compact and strong enough in
all its parts to resist the strain of its enormous weight, it might
be expected to keep its shape and position unchanged, holding loosely
within itself the shrinking centre. But it is formed of a great number
of materials, some hard, some soft and yielding. Therefore, as the
central parts lessen in size, the crust sinks downwards, and in so
doing it wrinkles into huge folds, like the rind of a shrivelling
orange or the skin of a very old man’s face. A ridge is pushed up here;
a furrow extends there. Here a long range of mountains is found; there
we see a succession of valleys.
By these movements the Ocean is both helped and hindered in its
“building.” As new land is formed under water, the “crust-creep”
perhaps raises it gently, and a strip of sea becomes dry land.
But another portion of the work, that of pulling land to pieces,
is checked; for let the waves strive as they may to wear away a
coast-line, a very slight upheaval is enough to counterbalance their
utmost exertions.
Such changes are usually gradual--so quiet, so deliberate, as only to
become apparent in the course of centuries.
Not that crust-movements are always sluggish. The ceaseless sinking
and crinkling of vast extents of country, the crowding together into a
smaller space of immense masses of material, cannot but cause enormous
pressure; and here or there a portion suddenly _gives_ under the
strain. Then the ground shakes and heaves, or some terrible landslip
takes place.
Earthquakes are now looked upon generally as signs of abrupt yielding
to intense pressure. Sometimes they indicate that a huge weight of
material deep down has slid to a lower level, packing more closely
or pushing aside other masses, and causing what miners call “a
fault”--that is a break or dislocation in the regular lines of the
stratified rocks. Or slip after slip may take place, one mass being
disturbed by the movements of a neighbouring mass; and so the ground
above may tremble again and again with recurring shocks.
Such shocks are fearfully common in some parts. In Japan, for instance,
it was noted that nine thousand had been felt in the course of only
eight years; and in one great earthquake alone--that of October 26th,
1891--almost ten thousand human beings perished.
Movements of the crust, whether slow or rapid, are not due always and
only to the shrinkage of the central portions of our globe, and to the
sinking and re-adjustment of the strata.
There are mighty fire-forces below; molten materials pent up, waiting
for the slightest yielding of the solid crust to fight their way
out; heated and imprisoned gases struggling for freedom. Sometimes
these captive giants escape through what may be termed the orthodox
safety-valves, old volcanic vents. Sometimes they break open new
craters for themselves. Sometimes they fail to get out, and only shake
the ground, or force it gently upward. Though earthquakes are more
usually ascribed to the effects of a steady “crust-creep,” they are
sometimes caused by heated gases seeking liberty.
These heavings and twistings, these crumplings and swayings, of the
earth-crust do not belong only to land, but go on in the same manner
under the ocean. Many an earthquake felt on land has its origin under
the sea; and others are so far out as to be felt only by passing ships.
In the Pacific alone it is said that about two thousand five hundred
shocks occur in the course of a year. Of the eight or ten thousand
shocks, believed to be about the average number throughout the world
annually, fully half have their origin beneath ocean-waters.
CHAPTER XIII.
OLD OCEAN AS A BUILDER
“Grain by grain His Hand
Numbers the unmeasurable sand.”--C. G. ROSSETTI.
“... The ever changing strand
Of shifting and unstable sand
Which wastes beneath the steady chime
And beating of the waves.”--WHITTIER.
As a vast Cathedral is made of separate blocks of stone, laid one
upon another and cemented together, so a stratified rock is formed of
tiny particles of substance, placed one over another and pressed into
solidity.
Let us scoop up a little sand from the sea-shore, and look at it under
a magnifying-glass.
We shall find a number of loose yellow grains, not all alike in
shape, but all somewhat rounded. Most of them are characterised by a
glittering hardness, and probably some are transparent.
For the most part these grains are of a substance called _quartz_,
which may be almost any colour from white to black. Some beautiful
forms of it are known to us, such as amethyst, agate, and jasper. But
we have now to do with the humbler relatives of those aristocratic
gems; with the more commonplace kinds of quartz, such as sandstone.
Sandstone rock is chiefly made of grains of sand, firmly compacted
together. An especial interest belongs to the rounded shape of these
little grains. Like many voiceless things in the world of inanimate
Nature, it tells its own tale, if only we will pause to hear.
Why should grains of sand be rounded? Why not square, or pointed, or
angular?
That is just what they were, not very long ago. Each sand-speck,
when first detached from rock or stone, had its angles and corners.
But these have been gradually rubbed away; and by the very same
process which, in the course of years, rubs away angularities and
eccentricities from the characters of human beings.
The work has been done through contact with its neighbours--not by an
occasional rub, but by steady friction, long continued. Each grain of
sand, rubbing against and being rubbed by its companion-grains, has
been rounded, smoothed, polished, till it has grown into the finished
specimen, without any obtrusive points or disagreeable angles remaining.
An unpleasant discipline, perhaps; yet, in the case of sand-grains and
also of human beings, worth undergoing for the sake of results.
Looked upon from a geological point of view, this shape of the
sand-grains means merely the wearing and wasting away of substance,
with no pretty explanation attached, though with a very definite
underlying story of their past history.
“No workman ever manufactured a half-worn article, and the stones
were all worn.” So wrote Hugh Miller when describing his first boyish
experience of toil in a Scotch quarry twenty years earlier. Boy as he
then was, his keen eyes noted the stones, “rounded and water-worn,
as if they had been tossed in the sea or in the bed of a river for
hundreds of years.” Boy as he was, he knew that stones, broken off from
larger stones or rocks, have at first their irregular shapes, their
corners and jagged points, which can only be worked into smoothness
by the action of water. Boy as he was, he realised that these quarry
inland stones had once been rubbed and shaped by ocean-waves.
He made a mistake in his assertion. Some workmen do manufacture
articles, not indeed really half-worn, but with the look of being
half-worn though actually new, for mercantile purposes--to pass off
the new, as if it were old, when the old has greater value. But it may
safely and with confidence be declared that the Divine Architect of
Earth and Heaven never so puts forth His mighty power. When we see in
Nature a thing _worn_ in appearance we know that it has been worn in
reality.
In his first day of quarry work Hugh Miller saw more than this. He
noted surfaces of sandstone rock, laid bare by blasting, all “ridged
and furrowed, like a bank of sand that had been left by the tide an
hour before.” He had seen the latter hundreds of times when sailing
over shallows near the shore. But here the ridges and furrows were
petrified, changeless, and on dry land, where no ocean-waves could
reach. No wonder he was puzzled.
Such ripple-marked sandstone is far from uncommon. It gives a perfect
reproduction of the little sand-ripples or rounded ridges and hollows,
often to be found on a sandy shore, either visible through a thin layer
of water or left bare after the tide goes down. And it shows us how the
sandstone rock must originally have been put together, under water.
Soft undulations were made in the wet sand by one high tide, becoming
in a measure hardened before the next high tide, and so keeping their
shapes, while a fresh supply of sand was dropped upon them, partaking
of the same outlines.
As time passed, more and more sand would be thus deposited, the ground
probably sinking and the weight of sand increasing, until the lower
layers had stiffened into rock. In after days a slow upheaval of the
ground came about, and where ocean waters had flowed would be dry land.
By-and-by--who can say how long after?--the ripple-marked slabs of
sandstone, petrified memorials of the past, would be found; perhaps far
inland, if the country had risen much; perhaps in a quarry by a young
Scotch working-lad, to be marvelled over as a specimen of old Ocean’s
bygone work.
Another such token of the past is found in hardened raindrop traces,
impressed on solid sandstone.
The rain fell on a soft sandy shore, making tiny holes in the sand,
with splashed-up ridges round each small hole. Have we not all seen
this? If not, we might have used our eyes better. Before the coming
in of the next tide the surface hardened, like the sand-ridges already
described, and so, being covered over by new layers of sand and
gradually transformed into rock, it was later uplifted above the sea,
and the holes have lasted intact until now.
It may be objected that the time between one high tide and another is
hardly long enough for any such hardening process--even on the hottest
and driest of summer days.
Then the hardening may have taken place only on that slender belt of
sand, which is covered for a day or two by the spring tides, and is not
again reached by ocean-waves for nearly a fortnight.
In earlier chapters it was shown--first, how the Ocean is ever striving
to keep a level surface; and secondly, how the object sought is never
attained to.
Not only are the waters in ceaseless motion, heaving to and fro under
the influence of every passing breeze, borne hither and thither by
mighty streams, disturbed by innumerable storms. But also the powerful
attraction of the land, particularly of great mountain ranges, lifts
the sea-surface in some regions hundreds of feet higher than in others.
So that a ship, passing from the neighbourhood of a mountainous coast
to mid-ocean, may be actually sailing or steaming downhill, actually
descending a vast gentle watery slope.
Another question as to Ocean’s level has much exercised the minds of
men.
Throughout the world, remains of sea-creatures in countless multitudes
are found embedded in the substance of water-built rocks: sometimes the
very rocks being made up of them. This, not only on the tops of lesser
hills, but at the summits of mountains eight thousand feet high, twelve
thousand feet high, sixteen or eighteen thousand feet high.
Very ancient remains they often are, certainly many tens of thousands
of years old. But whatever their age may be, they echo and add to the
story which is told by the rocks themselves.
From the rocks we learn that, once upon a time, long ago, they were put
together, scrap by scrap, under water, not upon dry land. And from the
fossil remains in those rocks we learn with equal certainty that, once
upon a time, they lay under ocean-waters.
Fossil remains, buried in rocks, are of many kinds.
Not only relics of animals, or of parts of animals, such as teeth
and bones and shells. Not only relics of sea-weeds and other ocean
vegetation. Not merely the actual remains, hardened into stone; but
also the casts or shapes of all such remains, found impressed in the
substance of the rocks. The whole of these various records of the past
must be included under the term “fossils.”
Firmer substances, like shells and bones, have become often transformed
into actual solid stone. But softer living substances have more
frequently passed out of existence, leaving only an impress or _cast_,
which is filled up later by some other substance.
When upon high mountain-tops such fossils are found--the remains
of sea-weeds and sea-creatures embedded in rock--the question must
naturally arise, How could these ocean-inhabitants have found their way
to such a height?
That the sea must once have flowed over them cannot be doubted. But
how did it come about? Were those water-built heights under the sea,
because in those times the land lay lower, or because the sea-surface
stood higher?
That the earth-crust is restless, heaving, disposed to rise and sink,
to crumple into furrows, to fold into ravines and mountain ranges, we
now know. Yet this may not be the whole explanation of sea-shells upon
high summits. It may be also that the surface of the sea itself--the
general level of the ocean--has not been always the same. It too may
have risen and sunk; not once only, but many times.
Between one and two hundred years ago there was a theory that the
sea had as a whole sunk lower, on account of the enormous drying up
of its surface. Of course the surface does dry up very much and very
rapidly. Yet this deficit in ocean-waters being met by equally enormous
down-pourings of rain and gifts of river-water, evaporation will not
serve to account for a lowered ocean-level all over the earth. So the
notion had to be given up; and in later years it was looked upon as
certain that the land must have risen, and that the ocean-level must
have been changeless.
Until recently this was regarded as established; but in the curious
see-saw of scientific theories the pendulum has begun to swing back.
Not all the way. That the land has risen in parts, shaking its skirts
free from ocean-tides, is not doubted. Scientists are, however,
maintaining that while this is true, the other need not be untrue. They
hold that, while land in many places has undoubtedly risen and sunk,
the ocean-surface may have risen and sunk also.
The ocean could not, indeed, like the land have risen or sunk only
in parts. Except where it is forcibly held at a higher level by some
strong force of local attraction, this would be impossible. Yet causes
might exist which should affect the whole ocean-surface.
One such may be mentioned. The rising or sinking of great tracts of
land could not fail to affect the ocean-level.
That it must do so may be easily understood. Let us fill a basin with
water, to within an inch of the brim, and then slowly lower into
the water a ball, or any other solid body. As the ball enters, the
level of the water rises--_must_ rise. Then let us slowly lift the
ball out again; and as it leaves the water, the level of the latter
sinks--_must_ sink.
Precisely the same result would follow upon the rising or sinking of
some great continental mass. When it rises, the ocean contains less
land, and the water-level must go down. When it sinks, the ocean
contains more land, and the water-level must go up.
This question has been long under discussion. For many years, as with
other questions, each side looked upon its own view for the time being
as the only right one. But--as again with many difficult problems--the
fairer and wider view recognises the possibility of truth in both
explanations, and probably in the end both will prove to be in a
measure right.
Many other kinds of rock, as well as sandstone, have been built under
ocean-waters in past ages, constructed of minute particles, piled
together, and hardened. Some sorts, like sandstone, are only or chiefly
mineral; while others are only or chiefly “organic”--that is, are
mainly composed of the remains of “organised” or living beings. About
the latter much has to be said in future chapters.
A very few words in the close of this chapter, as to the classifying of
different kinds of Rocks, may not be amiss.
Ocean-deposits, or Ocean-buildings, are often roughly divided into
three groups.
In “Deep-Sea Deposits” are included all that lie beyond the
Hundred-fathom Line, or a depth of six hundred feet.
In “Shallow-water Deposits” are included all that lie between six
hundred feet deep and low-water mark.
In “Littoral Deposits”--the word coming from the Latin for
“shore”--are included all deposits that lie on shore-lines, between the
highest and the lowest tides.
At first sight the tide-deposits might seem to be but a small matter.
Not so small, really! Earth’s coast-lines reach to something like one
hundred and twenty-five thousand miles in length. Since the medium
breadth of ground affected by tides is about half-a-mile, the whole
tidal area amounts to over sixty thousand square miles.
No mean workshop this, under the auspices of crushing and grinding
billows. On shore-lines building takes place rapidly.
The “Shallow” zone is much more extensive, reaching to some ten
millions of square miles. Its principal deposits are much the same as
those of the tidal zone--muds, sands, gravels, pebbles. In parts of the
Earth they also include volcanic and coral muds.
Greater, far greater, far more widely reaching, are the regions of
“Deep-Sea Deposits,” which cover more than one-half of the whole
surface of our globe.
In those cold and dark and silent workshops, hidden from the eyes of
men, building goes on, very quietly, very slowly, through interminable
ages. In those workshops are deposited divers materials--Red Clay, Red
Mud, Blue Mud, Green Mud, Volcanic Mud, Diatom Ooze, Globigerina Ooze,
and many others, forming Ocean’s carpet.
Almost any of these muds and oozes may occasionally be found in the
second division, but they more generally belong to the “Deep Sea.”
CHAPTER XIV.
HOW CHALK IS MADE
“Peace, moaning Sea, what tale have you to tell,
What mystic tidings, all unknown before?
Whether you break and thunder on the shore,
Or whisper like the voice within the shell,
O moaning Sea, I know your burden well!”
LEWIS MORRIS.
“The tiny cell is forlorn,
Void of the little living will.”--TENNYSON.
One of the tasks carried on in Ocean waters is Chalk-Building.
The “White Cliffs of Albion” and those also of Gaul are vast masses of
chalk, containing layers of flint, and mixed with many other materials,
but chiefly composed of the crumbling white substance, which is
familiar to all who live near the North and South Downs.
This formation stretches a long way. The heights of Salisbury are of
chalk. The Chiltern Hills are of chalk. The Yorkshire Wolds are of
chalk. It is found in Norfolk; it is found in Kent; it is found in
Surrey; it is found in Sussex. There are chalk-beds in France, in
Germany, in other parts of Europe--not to speak of Asia--which, with
those of Great Britain, extend through many hundreds of miles.
And wherever these masses of chalk are found, there we know that, once
upon a time, the land lay under ocean-waves.
For Chalk, like Sandstone, was not formed on dry land. It could not be
formed on dry land. It was built--it could only be built--under the
sea, to be in later ages uplifted as dry land.
During those far-back days, when the chalk-beds of Europe were being
made, a different state of things prevailed from that of the present.
By far the greater part of Europe must have lain under water, from
which the summits of the Alps, the Pyrenees, and other mountains
emerged as groups of islands. Great Britain must have been chiefly or
entirely hidden.
So far I have spoken of sandstone and chalk together. But a marked
distinction--a _vital_ distinction--exists between the two.
In the mode of their building they may be alike. In the materials of
which they are built they are utterly different.
If a lump of chalk is examined by the chemist, its principal substance
is found to be Carbonate of Lime.
Now there is something very remarkable about Carbonate of Lime. It is
absolutely different from the materials of which sandstone and granite
are made. Wherever we stumble upon carbonate-of-lime, there we are on
the track of LIFE. And the moment that we touch upon LIFE, even in its
simplest and lowest forms, we rise to a higher level.
Hitherto, in this subject of the Mighty Deep, we have had to do
with things inanimate; things without consciousness; things blindly
controlled by the forces of nature. In the story of ocean-waters, of
ocean-salt, of ocean-rivers, of icebergs and ice-floes, Life has no
part. There is no life in a grain of sand, no life in a granite rock.
But here, suddenly, we are arrested. Here, in the composition of Chalk,
we come across a difference. Here, at one step, we pass over a vast
dividing chasm, and stand face to face with that which has Life.
Not indeed that which lives now, but with that which did live, the
signs of which may better help us to understand Life in the present.
Is this so new? Have we not already in former chapters found tokens of
creatures which once existed, of fossil remains embedded in rock?
Yes; but that was not the same. Fossil remains are discovered in many
kinds of stratified rock. Here we are not concerned with separate
remains, buried in masses of chalk, but with the actual substance
of chalk itself. The mere building of it, as earlier told, closely
resembles the building of sandstone. Chalk, like sandstone, was formed
in past ages out of tiny particles, carried by ocean-waves, dropped
upon ocean’s bed, slowly consolidated, then gradually upheaved.
Particles of----
Ah, there we reach the great distinction!
Not particles of inanimate mineral substances, such as grains of
quartz. No; but particles which once formed the habitation of living
creatures. More than this--particles which once shared in the Life of
the beings with which for the time they were in touch. Infinitesimal
specks, often so minute as to appear only as fine dust to man’s unaided
sight; yet real organic remains, each one of which has been the home of
an active animal.
A lump of chalk is a mass of densely packed tiny fossil shells, more
or less crushed and broken. It has been reckoned that a cubic inch of
chalk probably holds at least one million shells.
Try to imagine what this means. The work of the Ocean in building solid
sandstone, from unnumbered myriads of myriads of grains of sand, is
marvellous enough. But here we have something far more wonderful.
Here we have rocks and cliffs, ranges of hills and extents of country,
to a great degree composed of almost invisible sea-shells, so small, so
numerous, that a million or more of them may be packed into one little
cubic inch of space, while the chalk-beds lie through hundreds of miles.
Think of continuous piles of these shells, many hundreds of feet in
thickness, all built out of the dead shells of dying millions of tiny
creatures. Deep, deep below the surface, where waves had no power,
where currents were sluggish, fell a ceaseless gentle rain of these
minute shells. Life had fled from each jelly inhabitant; its brief day
was over; and the empty shell went quietly down, whether from near the
surface or from lower depths, till it reached the ocean-bed. There it
lay, forming part of a gathering sticky ooze or mud, which in later
times should be slowly hardened into chalk.
But the greater wonder has yet to be told about these shells--these
tiny highly-finished constructions.
Not only did a speck of living jelly once inhabit each shell. That
speck of living jelly actually MADE the shell.
Not deliberately. Not with intention. Not even consciously. The
“making” is in no sense to be confounded with voluntary effort, with
the labour which means exertion and fatigue. It was as instinctive, as
involuntary, as the “making” of bones in your body and mine.
“But we do not make our bones,” somebody may protest, with a touch of
indignation.
Undoubtedly, in a sense, we do. The jelly-speck does not more surely
“secrete” its shell, than a man “secretes” his skeleton. Personal will
has not to do with the task in either case, beyond the taking in of
necessary food; and neither man nor jelly-speck may claim any credit on
the score of the pattern worked out.
We have all seen a garden-snail, carrying lightly upon its back
its shell or “house,” or outside skeleton. That shell is formed
of carbonate-of-lime. In the snail’s slimy body exists a small
manufactory for producing or “secreting” carbonate-of-lime. The
materials are obtained by the snail through its food. The deposits
of it--made as the snail’s nature, certainly not the snail’s
reason--dictates, grow into a sheltering framework for its protection.
In a Dictionary we may find the strict meaning of this word “secrete.”
It is given as--“to hide; to conceal; to deposit in some secret or
private place; to separate from the blood in animals, or from the sap
in vegetables, and elaborate into a new product.”
One cannot deny that the word, though used for all such “elaborations,”
is more appropriate in the case of a man’s hidden and private framework
of bones, than in a snail’s or jelly-creature’s outside shell.
That which the garden-snail so deftly does, is done also by countless
billions of minute jelly-specks in the ocean; though with the latter
the mechanism is far simpler, because the animal belongs to a far lower
and more primitive type.
Still, simple though the apparatus may be, the tiniest of these
jelly-specks has power to separate lime from ocean-waters, to unite it
with carbonic acid in its own frame, to form carbonate-of-lime from
the two, and to build of the manufactured carbonate-of-lime a shell for
its own use.
Thenceforward, for a little space, the jelly-speck lives in that shell,
and feeds in that shell, and then it dies in that shell. When it exists
no longer, down sinks the lifeless skeleton, to serve a new purpose at
the bottom of the sea.
No mere shapeless lumps are these shells, flung together without care
or plan. Each one, however infinitesimal in size, is a delicate and
elaborate construction; each one shows the carrying out of a definite
and beautiful plan. A different design serves for each species and kind
of jelly-speck--not for each individual.
Such Design we must ascribe to a Mind lying beyond that which we see;
not to the jelly-speck itself, which acts as an unconscious architect,
working automatically, as you and I work in the early growth and later
renewal of our bony frameworks, the “secreting” of our skeletons.
No chance tossing together of particles of carbonate-of-lime could
result in the exquisite forms, the intricate patterns, of these little
shells; still less, in such patterns being faithfully reproduced by
millions of living jelly-specks, each according to its own class or
variety.
For all this the present tense is as true as the past tense.
Those white cliffs along the coast were formed ages ago. But the ocean
is working still, building still, piling grains of sand together still,
heaping specks of mud together still, and laying shells, shells,
shells, together still, in amounts beyond all reckoning.
Chalk-building went on in ages past; it goes on now; and doubtless it
will go on in centuries to come.
Not only beyond reckoning, but beyond imagination, are the enormous
multitudes of these creatures, which live and die in the ocean, forming
their shells, and adding their skeletons to the ever-growing pile below.
Over a large part of the Atlantic bed, as over other Ocean-beds too,
lies a thick ooze. When this was first brought to the surface, in
soundings that were made before the laying of the earliest Atlantic
cable, it was supposed to mean a thin deposit of no particular
importance.
Then a deep-sea dredge, plunged into the ooze, carried away half-a-ton
of it, and men began to realise what its presence might mean. By a long
succession of soundings, its true nature became slowly manifest.
The ooze was found to be composed chiefly of tiny rounded shells,
called “Globigerina,” which belong to a larger class, known as
“Foraminifera.” And the white chalk of our British cliffs is made
principally of Foraminifera shells.
This last name springs from two Latin words, meaning “I bear a hole.”
The Foraminifera shells bear many holes. Each is in shape a tiny
collection of rounded compartments, usually not more than sixteen in
number; and each compartment has numerous minute holes in its walls.
Its inhabitant, a speck of jelly, is one of the least of living
creatures, belonging to the great Division of “Protozoa,” or “First
Animals.” None rank below them, for they are on the first or lowest
rung in the ladder of life.
A jelly-speck has no head, no limbs, no stomach, not even a mouth. It
can take in food at any part of its soft body. When it wishes--and
apparently even a jelly-speck can _wish_, which at once separates it
from inanimate materials--it makes a temporary tentacle or “foot,” by
pushing out a slender filament of its own substance through one of the
tiny holes in its shell. Whence the name “Rhizopod.”
Not all the Foraminifera specks live in the same kind of sheltering
skeletons. Some construct delicate domes or many-chambered discs of
sand-grains, joined together with enough carbonate-of-lime to act as
building-cement. Such skeletons are called “tests,” to distinguish them
from “shells” proper.
Hardly anything can be more remarkable than the way in which these
tests are put together by mere specks of jelly, alive indeed, but
without parts, without development, without understanding. How and why
they should choose from one place, each the especial materials which go
to form its own kind of “test,” is one of the mysteries in Nature for
which Science has no explanation. We can but look and marvel.
One kind of jelly-speck will use the larger grains of quartz, arranging
them, and joining them into a bottle-shaped test or shelter.
Another, in the same spot, belonging to a different species, will
select tinier grains of the same substance, and will build out of them
a rounded sphere, exquisitely modelled, with tiny holes at intervals
for the protruding “limbs.”
Another, of yet a different species, picks out the minutest of
sand-grains and of bits of sponge-spicules, and knits them together,
without any cement, into delicate white globes, “like homœopathic
globules,” giving to each a single opening.
And still another, of again a different species, forms a test of divers
compartments, with a tiny doorway leading from each into the next.
Behind all these extraordinary constructions lies a MIND. But--_not_
the mind of the jelly-speck!
Soft oozes, formed chiefly of Foraminifera and other shells, varying
in size from a pin’s head to almost invisible specks--though some few
kinds are larger--cover immense reaches of the ocean-bed, extending, it
is said, over fifty millions of square miles.
Yet they are not found everywhere below the sea. Near to Continents,
if they exist they are lost sight of amid the masses of sand and mud
carried down from the land. And in the profounder abysses of the ocean
they are lacking.
This last fact was long a puzzle. If the waters above were swarming
with live Foraminifera, the dead shells of which must be ever pouring
in a quiet rain to the ocean-bed, why should not the same ooze be found
there, as elsewhere?
That the waters above, at least in all warmer climates, do swarm thus,
is certain. Towards north and south, in colder seas, they rapidly
lessen; but in tropical regions, and in warm ocean-streams their
numbers are legion. Yet, from depths beyond about two miles, the ooze
was not brought up.
One explanation can be given; and it is that of the strong dissolving
power of sea-water. After a depth of about two miles, the delicate
little shells fail to resist that power. Once at the bottom, they might
be covered up and preserved; but they cease to exist _en route_ thither.
So in this as in many other instances, we see opposite forces at
work. The one force is perpetually undoing what the other force is
perpetually doing. Innumerable multitudes of living creatures are at
work, taking lime from the water, and constructing carbonate-of-lime.
But the ocean is ever seeking to re-dissolve that carbonate-of-lime.
Another difficult question as to the ooze was--whether the shells of
which it is mainly made were those of Foraminifera living in the deep
sea, far down below the surface, or of Foraminifera living near the
surface. Able men took both sides of the discussion, some ascribing the
ooze entirely to deep-sea jelly-specks, others ascribing it entirely to
surface jelly-specks.
The question cannot be said yet to have met with complete settlement.
But here once more it seems that both sides have been partly in the
right.
There are Foraminifera which live only at great depths, and there are
Foraminifera which live only near the surface. The ooze is found to
consist of shells belonging to both kinds, though it may be that the
surface species carry away the palm in point of greater multitudes.
CHAPTER XV.
OF OCEAN-WEEDS
“Have hung
My dank and dripping weeds.”--Trans. HORACE.
“The tide is full, the moon lies fair
Upon the Straits; on the French Coast the light
Gleams, and is gone; the Cliffs of England stand,
Glimmering and vast, out in the tranquil bay.”
MATTHEW ARNOLD.
Scattered through the vast Chalk-beds of Great Britain and the
Continent are thousands of layers of FLINT, such layers as any of us
may have seen intersecting the smooth white face of Chalk Cliffs. And
as with Chalk, so with Flint--we at once find ourselves upon the track
of Life.
Not indeed always of animal life. Sometimes vegetable life takes its
place. Though the highest Vegetables stand on a lower level than the
lowest Animals, they too have Life, and thereby they are entirely apart
from the whole world of inanimate Nature.
Widely distinct are the Animal Kingdom and the Vegetable Kingdom; yet
on the borderland between the two is found a hazy belt of uncertainty.
So gently does the one glide into the other that, though a line of
demarcation does exist, it is not always easily made out. But the
transition from the lowest form of that which _lives_ to any and every
form of that which has no Life is abrupt, absolute, precipitous.
Here we see no quiet sliding of the one into the other, no wavering
hesitancy as to whether a certain something may belong to this or that
side of the dividing parapet.
The term “Vegetables,” used scientifically about Land Vegetation,
includes all manner of growths, from the lichen to the forest tree.
But by that word, used in connection with the Ocean, is meant, _not_
cabbages and cauliflowers, _not_ garden-plants or forest-trees, but an
enormous variety of Sea-Weeds.
And among ocean-vegetables of humblest form, flourishing in salt water,
is that of Diatoms--Flint-makers.
It need not be imagined that the manufacture of Flint is a monopoly of
the Diatom tribe. That would be a mistake.
We have had to do in the last chapter with small carbonate-of-lime
building jelly-specks. We shall have to do in the next chapter with
carbonate-of-lime building jelly-polyps. But there are also little
vegetable-growths in the sea which form carbonate-of-lime, and some of
these add their quota to the work of rearing Coral-reefs.
We have to do in the present chapter with small flint-building
vegetable-growths. But there are also little animal jelly-specks in the
sea which form flint.
So neither Carbonate-of-lime nor Flint can be spoken of as belonging
_only_ to Animal or _only_ to Vegetable Life. They must both be
described in general terms as the outcome of that which Lives.
Among other Flint-builders in the ocean are the Radiolarians; living
jelly-specks, and makers of the most exquisite shells, so tiny in size
that millions of them may be packed into one cubic inch. These belong
to the Animal Kingdom. They rank with the Foraminifera, differing from
them chiefly in the fact that their shells or skeletons are formed of
silica, not carbonate-of-lime.
But in this chapter we are concerned with the Vegetable Life of the
ocean, and we must therefore let the wonderful Radiolarians alone.
Properly the chapter on Vegetables ought to have come before any
chapter on Animals, since we have been climbing upward from inanimate
Nature, and since all vegetables rank below all animals. When on the
topic of Ocean-building, however, the subject of Chalk seemed to follow
naturally after that of Sandstone. And this little volume makes no
pretensions to stiff classification.
No surprise need be felt at vegetables being able to make or “secrete”
flint and chalk. This making is, as we have seen, an unconscious work.
The living jelly-speck secretes automatically, not with intention.
Such secreting is not confined to ocean vegetables. Trees and plants
on land manufacture a host of substances--sweet oil, cocoa-nut milk,
indiarubber, and countless others.[2] Forest trees in like manner grow
their own framework of hard wood, which may be said to take the place
with them of a skeleton.
[2] The spicules of silica may be seen on coarse grass, secreted by the
grass.
All this is a part of LIFE. Inanimate rocks and stones may lie for
centuries unchanged, except through friction with other rocks and
stones, or with running water. But where Life reigns, though it be of
the simplest kind, there growth and development must follow.
Life, from its very nature, cannot mean stagnation, or standing still.
It must always be assimilating. It must always be expanding. It must
always be doing. When these things cease, death has begun.
So much alike are the lower forms of life in the two classes, that
many an animal has been for a time mistakenly called a vegetable, and
many a vegetable has been for a while supposed to be an animal. The
foraminifera were once ranked as vegetables, and the diatoms were
ranked as animals.
In deep-sea regions, dark and cold, no vegetable life can possibly
exist, not even the almost ubiquitous diatoms. But their remains are
present in vast multitudes. As the tiny plant-life dies out, the little
hard vegetable-cases sink to the ocean-bed, there to mingle with
gathering muds and oozes--there, too, in the course of ages, to be
transformed into Flint.
Diatoms flourish on land as well as in the ocean; in cold climates
as well as in warm. On the whole they prefer the colder regions,
therein differing from the warmth-loving foraminifera. Sometimes
immense floating banks of these microscopic plants are found, reaching
through many miles. A net, lowered into such a bank and then drawn up,
is filled with a “brown-coloured slimy and felt-like mass,” made up
chiefly of uncountable myriads of diatoms.
Such masses are held together by a kind of sticky jelly, and if the
hand is passed through it a very slight roughness may be perceptible,
caused by the flinty diatom shells or cases.
Mere specks indeed they are, individually too minute to be seen by a
human eye, unaided. Yet how marvellous in their make!
A Diatom plant or vegetable or sea-weed, whichever we choose to call
it, is like a Foraminifer of the simplest possible structure. It
consists of a single cell, with an outside flinty coating or inclosure,
answering to the wood of a tree or the skeleton of an animal.
This flint casing, though infinitely small and delicate, is yet firm
enough to prevent the passage of water through it; and also it is
practically indestructible by ordinary forces. Diatom-cases, dropping
to the ocean-bed, may lie there for ages.
[Illustration: DIATOM CASES (ARACHNOIDISCUS JAPONICUS)
_Reproduced by permission of Messrs. R. and J. Beck, Ltd., and Messrs.
J. and A. Churchill, publishers of Carpenter’s “The Microscope”_
_Face page 154_
]
The living cell is inclosed in the said “case,” which is a kind of box,
consisting of two halves or “frustules,” neatly joined together by a
ring or girdle.
Diatoms increase in numbers, like many of the Foraminifera, by simply
dividing into two. When the living cell thus parts, each half takes as
its share one side of the box, and each then makes another side, or
“frustule,” to complete itself. For this operation, the tiny ring or
hoop doubles into a pair of hoops, one of which clings to each half of
the case.
Perhaps in all the world no greater marvels are to be seen than these
extraordinary minute vegetable-cases.
[Illustration: PART OF DIATOM CASE (PLEUROSIGMA ANGULATUM)
Magnified 4,900 diams.
_From a photo-micrograph by Dr. R. Zeiss_
_Reproduced by permission of Messrs. C. Zeiss and Co. and Messrs. J.
and A. Churchill, publishers of Carpenter’s “The Microscope”_
_Face page 156_
]
Minute! Yes. A mass of millions upon millions, held together, may be
perceived and felt. But let a light scattering of them be dropped upon
a slip of glass in broad daylight, and let a man of keen eyesight set
himself to examine them. He will see--nothing! Not even an appearance
of delicate dust. The diatoms are to him as if they did not exist.
Then let him put that fine scattering under a good microscope, changing
lens after lens, to higher powers. A world of beauty, of finish, of
originality, of unbounded variety in construction, will open out before
him.
Each little shell is exquisitely shaped, exquisitely put together,
exquisitely ornamented. Though thousands, nay, millions, of them might
be packed into a cubic inch, yet there has been no carelessness, no
scamping, in the work, no saying, “Nobody will see, so anything will
do.”
The different kinds of Diatoms are innumerable; and each kind, each
species, even each variety, has its own especial form, its own complex
design, followed out and faithfully reproduced in hundreds of millions
of individuals.
Pattern-markings, by which each variety is distinguished, formed of an
infinitude of delicate lines and dots, arranged in every imaginable
fashion, vary to an extent almost beyond conception. There are cases
round, triangular, lengthy, many-sided, chain-like--but to picture them
in words is hopeless. They have to be studied in their own wonderful
minuteness and delicacy, complexity, and loveliness, before they can be
known.
In all this again we surely find unmistakable evidence of a MIND,
hidden, out of sight, inventing and designing.
Not the mind of the vegetable-speck, which for a brief space is
sheltered in the ornate little flint-box, but of a Higher
Intelligence--whether that of the Creator Himself directly, or whether,
as may seem to some more probable, the mind of some intermediate
Worker, Divinely appointed to the task.
Why should not Angelic or other beings, in the Unseen World, be allowed
to exercise their powers in such wise, even as man upon Earth is
allowed to think, to plan, to discover, to devise, to invent, according
to his mental gifts?
Some such possibility may well suggest itself to a thoughtful
imagination, as the variety of developments in these tiny sea-shells
or cases becomes apparent. All the more, because the developments are
not found scattered, haphazard, in single specimens, but--as above
stated--are accurately followed out by the multitudes belonging to each
variety.
It seems that every individual of every separate kind has power to form
certain shapes, with certain markings, and no more. It is as if upon
each minute speck of vegetable life had been originally impressed its
own--not _individual_ character, but _class_ character. This character
unconsciously expresses itself in such and such a form of shell, just
as with men the individual character expresses itself in such and such
outlines of face. The same may be said of Foraminifera and Radiolarian
shells.
Some Diatoms have a singular power of movement; and from this sprang
early mistakes, through which they were wrongly classed as animals.
Many of them grow, like ordinary plants, fixed in one spot. But
many others are in continuous and regular motion. Careful study
has, however, made it clear that the movements of Diatoms are
purely mechanical, purely involuntary, like those of some sensitive
land-plants. It is probably due to the working of food, taken into the
little organism, and not obedient to any _Will_ on its part.
It may be that herein lies the great difference between a Diatom and
a Foraminifer. The one exists, but has no approach to consciousness;
or, at least, probably no approach to any power of choice. The other,
though of the very lowest and feeblest type of Animal-life, may yet
be supposed in its infinitesimal measure to have a _wish_, and to be
able to act upon that wish. But here we do not get beyond conjecture.
Where Life exists, it _may_ be that in all cases some dim form of
consciousness exists also, which _may_ involve some faint power of
choice.
Flint-making, like Chalk-making, is not only an old-world and long-past
operation, but a present one. Diatoms lived and died in ages gone by,
and their remains are found hardened into flint. Diatoms live and die
in these days; and their remains may yet, in centuries to come, be
transformed into the same substance.
From Diatoms one might range upward through an enormous variety of
Ocean-weeds, of all kinds and descriptions.
Though they are the “last and lowest of all the tribes of plants,” yet
it is a wide step from the undermost to the uppermost of even this
humble Vegetable Tribe.
At least five or six thousand species of Sea-weeds are known to
Naturalists. Each ocean, each lesser sea, has its own particular
vegetation, largely affected by the varying degrees of saltness, the
warmth or coldness of the water, and the faster or slower currents
which happen there to prevail.
Sea-weeds of all sizes are found, from the invisible diatoms to
enormous growths in Pacific waters, reaching to yards upon yards in
length, with solid trunk-like stems, and huge fronds like those of a
tropical palm.
Near Tierra del Fuego immense growths have been seen, with stems
between three and four hundred feet in length. Great sub-ocean forests
of kelp are there, and floating fucus-islands, with leaves or fronds
seven or eight feet from base to tip, covered with living animals, and
having air-vessels several inches long.
In the matter of colour no great variety exists. Sea-weeds are
generally either grass-green, olive-brown, or red. The green are
usually close to land, and they never grow beyond touch with direct
sunlight. The olive-brown are the more abundant; and the red belong,
perhaps, more often to deep water.
A large majority grow attached either to stones or to the shallow
sea-bottom, but some kinds float unattached. To this last class belong
the masses of weed in the Sargasso Sea--the centre of the North
Atlantic currents.
Round that huge collection of weeds and drift, which reaches over
something like two hundred and sixty thousand square miles, the
entire North Atlantic slowly revolves. And of these weeds--called
“Sargassum”--none are attached to rock or ground, but all float
loosely in mid-ocean. They seem to flourish thus, though the fact that
fructification is not found upon them points to a somewhat unusual
condition of things.
Sea-weeds more often multiply by means of spores, which is a form of
vegetable-growth inferior to that of seeds. All spore-growing plants,
whether on land or in the sea, take a lower rank than seed-growing
plants.
A still lower and humbler method has been earlier described--that of
simply dividing into half.
There is yet another way by which ocean-weeds increase, and it reminds
one curiously of the gardener’s plan of growth by cuttings.
In rough weather, on shallow reaches not far from land, the waves tear
quantities of sea-weed fronds from their moorings, and carry them to
shore or to rocky parts, where they become entangled, and are held fast.
There, if later waves do not again dislodge them, and if other
circumstances are favourable, the wandering fronds settle down, attach
themselves, and become fresh plants. So in this case the waves act as
gardeners, and make cuttings of ocean-plants.
While plant-life in the ocean is plentiful in amount and abundant in
variety, it is confined within limits. By far the greater part of
Sea-weed existence is contained in the Hundred-fathom limit--that is,
within six hundred feet of the surface. Not many kinds, indeed, can
grow in anything like as much depth as five or six hundred feet.
Sea-weeds in abundance are found on shallow shores, near continents and
islands; on the zone between high and low tides; and on gently-shelving
slopes beyond that zone. Floating unattached sea-weeds, of the type
which belongs to the Sargasso Sea, may be anywhere, over the deepest
depths of the ocean. These, however, are not found living and growing
very far beneath the surface: and Ocean’s depths are without any kind
of vegetable-life, except probably bacteria.
CHAPTER XVI.
CORAL ARCHITECTS
“Who layeth the beams of His chambers in the waters.”--Ps. civ. 3.
“And surges roaring from below.”--DIBDEN.
Coral is a familiar enough object with us all, whether in the shape
of a child’s first plaything, or a girl’s first trinket, or a Museum
curiosity. It may be red or pink or white; it may be polished into
smoothness or left in its natural state of jagged roughness, dotted
over with tiny pits. In any case, it is a thing of interest and beauty.
In any case, it is the dead skeleton of a once-living animal.
In the Red Sea alone about one hundred and twenty kinds of Coral are
found, and in Ocean waters the numbers rise rapidly.
Perhaps one of the species best known to us is the small red coral
of the Mediterranean, usually gathered from shallow parts, though
sometimes fished up from a thousand feet deep.
This kind seldom exceeds ten or twelve inches in length; and when
alive, the pretty branching skeleton is clothed in a thin tinted
jelly-like vesture, which, though in a sense one, is yet no “single
individual.” It is formed of many polyps, all united together, while
each has its own separate mouth, and each holds out its own tiny
feelers for food. Once let the branch be taken from the water, and
only one result can follow. Life quickly fades; the enfolding vesture
disappears; and a bare red skeleton is left for use in the market, to
be made into toy or ornament.
The word Coral has other associations. It carries our thoughts far from
home to fair isles in tropical seas--isles connected in our memories
with tales of shipwrecked mariners and hair-breadth escapes, of dashing
waves and peaceful lagoons, of breadfruit trees and waving palms, of
perpetual sunshine and endless holidays, of Robinson Crusoe adventures
and interesting islanders, of poisoned arrows and ferocious sharks.
Such islands do exist, and in numbers far greater than we commonly
realise.
At this moment I have before me a map of the world, made for the
express purpose of showing “Coral Seas,” or the regions where Coral
islands are constructed. And the red patches are astonishingly
plentiful, dotting a broad belt of ocean all round the world, except
where that belt is interrupted by Continents, within the limits,
roughly, of 30° north latitude and 30° south latitude.
In the West Indies coral islands abound. Travelling westward from
America we come across the same material, in extensive regions to the
north-east, the north, and the north-west of Australia. Tahiti, Samoa,
the Fijis, the Solomons, the New Hebrides, the Carolines, the Marshall
Islands, the Seychelles, and innumerable others, are literally made of
coral.
Not made as sandstone and chalk are made, put together by the slow
action of the sea, far below the surface. This is another kind of
making.
Coral is built by living creatures, near the surface of the water.
All that the waves have to do is, firstly, to bring abundance of
food to the polyps, when alive, since by reason of their ponderous
rock-skeletons they cannot go in search of food; and secondly, after
the death of the polyps, to break and grind and heap together the
skeleton-remains.
We have seen something of ocean “stone-makers,” in the story of Chalk.
Here we have the same thing again. As the tiny shells, which go to the
building of chalk, are the dead remains of once-living jelly-specks,
so these great masses of coral, forming islands and reefs in southern
seas, are largely the skeletons of once-living polyps.
A coral-polyp, like a jelly-speck, has power to take lime from
sea-water. It has power to secrete carbonate-of-lime. It has power to
deposit that carbonate-of-lime in solid masses.
But whereas the jelly-speck lives inside its shell, putting out tiny
temporary limbs through holes for food, the coral-polyp more often
lives outside its skeleton, clothing the dry bones with translucent
jelly. This is rather more after the fashion in which man clothes his
skeleton. Yet because of its make the coral-polyp cannot properly, in
the full sense of the word, “secrete” or hide its internal framework.
It is hardly fair to speak of “the polyp” and of “it” in this
connection. “Polyps” and “they” are more correct.
For the coral-polyps live in close communities, in very near
fellowship, acting on co-operative principles of the most advanced
kind. Each individual may, it is true, have its own mouth, its own
tentacles, and even its own small stomach. But the latter at least can
hardly be reckoned as personal property, since all are so connected
that liquids pass freely from one to another, and the food which is
taken in by one polyp helps to nourish its neighbours.
And again, while we speak of coral as being “built,” that really is not
the right word; unless we may also talk of the “building” of a man’s
skeleton, or of an elephant’s framework.
“Built” undeniably it is; but the building implies no conscious effort,
no deliberate intention, no praiseworthy exertions, on the part of the
builder. Coral is simply “secreted”--is unknowingly and without choice
put together by the polyps.
There _is_ invention; there _is_ plan; there _is_ design. But these
belong to a Mind, above and beyond and out of sight; not in anywise to
the live jelly which clothes the coral-skeleton, or to the extremely
limited understanding of that co-operative jelly-sheet.
Not all polyps have stony skeletons. On our sea-shores we have species
many, and individuals by tens of thousands, which secrete no coral.
They are known to us as Sea-Anemones: and the first-cousins of these
dainty flower-like beings, inhabiting British salt-pools, construct
miles and miles of coral far off in southern seas.
Some few even among coral-polyps live individual lives, but the greater
number follow the community-system. This must always be looked upon as
an inferior way of existence.
The most usual way in which polyps increase is by “budding”--not unlike
the growth of a plant by buds. A small lump appears on one side of the
parent, which increases fast in size, develops a mouth and tentacles,
and by-and-by gives birth itself to other buds. The increase of numbers
is enormous. One polyp may produce in a short time thousands or even
tens of thousands of descendants.
But in the case of coral-polyps the children do not leave the parents
or go out into the world. They cling to the old stock; they partake of
the united family-life; and each little mouth and stomach works for the
benefit of all the little stomachs of the whole community.
Some polyps, instead of budding like a plant, increase by division.
One polyp separates into two parts, each of which becomes a full-grown
animal; and each then divides anew; this plan continuing _ad
infinitum_. Here again the growth of numbers is not slow.
Occasionally, in place of spreading in branch-like shapes, they grow
in solid rounded masses. Such a sphere-like mass in tropical waters of
the Pacific may be twenty feet in diameter--one huge family of united
beings, each perhaps under a twentieth of an inch across, and all
together clothing a skeleton common to the entire clan.
In these cases the tips of the branches or the outer edges of the
rounded mass are the _young_ polyps, while the older ones lie lower
down or more inward.
As the tree or ball of coral grows, spreading farther, giving birth
to fresh generations of polyps, the old ones die off. So the living
and the dead are found in one community, in close touch, on a single
branch or a single mound of coral. At the tip of each twig may be
the brightly-coloured active jelly, while the stem below is a dead
skeleton. On a solid mass of coral, twenty feet in diameter, the whole
outside may be alive, down perhaps to a depth of half-an-inch, while
the whole inside is lifeless bone. That is how the coral grows.
Living coral is seldom found at any greater depth in the sea than
about twenty fathoms, and the limits of temperature which the polyps
can endure are narrow. Their growth is quickly checked by water a
little too deep or a little too cold, and by water not very pure.
Abundance of lime also is needful.
An “atoll” is a coral-reef standing alone, generally of a round or oval
shape, with a lake of calm sea-water in its centre, while ocean-billows
thunder on the outer margin. The polyps love those waves; but they fade
and die in the inclosed lagoon, where the water is not often enough
renewed to supply them with food.
Much the same in make are the Fringing Reefs and Barrier Reefs, except
that the former skirt the shore more closely, while the latter may lie
at a distance of many miles from island or mainland.
It is impossible for the polyps to raise their stony structure above
the sea. Some kinds can endure exposure to the air for a short time
without dying, but only for a short time. A coral island, when first
built, is merely level with the ocean-surface at low tide.
But old Ocean carries on the work which the polyps have begun. Heavy
rollers break incessantly against the reef, loosening blocks of coral,
some of which are flung bodily upon it, while others are pounded into
sand, which fills up holes and crevices. Gradually thus the whole
becomes cemented into hard reef-rock.
As this goes on the low island slowly rises, until it has climbed above
high-tide level.
Then the task can only be completed by waves of exceptional reach.
Still the grinding of coral to fine sand goes on; and in time it gains
a depth of some inches. And the waves carry seeds and cocoa-nuts to the
spot; and shrubs and trees spring up, to sow again their own seeds,
and by gradual decay to form mould. Thus it comes about that a little
island is made ready for man to live on.
One might expect these stages to be very slow indeed, but such events
march at the double in tropical climates. In the Low Archipelago one
atoll was found, in the space of only thirty-four years, to have been
transformed from a mere rock-reef to a lagoon island, fourteen miles in
length, with tall trees growing along almost the whole of one side.
As a specimen of the sizes to which coral-buildings reach, the Maldive
Archipelago may be named. It is a vast collection of islands and reefs,
stretching to a length of four hundred and seventy miles, and in parts
fifty miles broad. Barrier-reefs, reaching through many hundreds of
miles, are even more remarkable.
Travellers write stirring descriptions of the beauty of these
erections. The vivid pen of Miss Gordon-Cumming, for instance, has
painted many a picture of Pacific reefs, of thundering breakers, and
dazzling white surf.
We are told by her of “the patches of coral, sea-weed, and sometimes
white sand, lying at irregular depths beneath a shallow covering of
the most crystalline emerald-green water,” producing “every shade of
aqua-marine, mauve, sienna, and orange, all marvellously blended.”
And, again, of the wonderful masses of living coral which grow like
garden-plants below the clear water, and of branching shrubs of all
imaginable tints, such as pink, blue, mauve, and primrose.
To pluck and carry off these ocean-blossoms would be a vain attempt,
for the “gelatinous slime” to which the colours belong “drips away, as
the living creatures melt and die, when exposed to the upper air.”
From the pen of another eye-witness[3] we have a description of a visit
at low-tide to the barrier-reef of Levuka, the old Fiji capital. We
learn that the reef itself consists mainly of dead coral--“rough,
uninteresting, shapeless limestones, with a very small covering of
seaweed.” But after about a quarter of a mile of difficult walking,
the travellers drew near to the “roaring surf on the outside,” where
“fingery lumps of beautiful live coral began to appear, of the palest
lavender-blue colour.” By the time that they were nearly within touch
of the spray, “the whole floor was one mass of living branches of
coral.”
[3] The Hon. Ralph Abercromby.
It was not, however, until they ventured actually into the water,
beyond the outer verge of the “great sea-wall,” that they could see for
themselves the true nature of the reef.
This was the description given. “You look down, and see a steep
irregular wall, extending deeper into the ocean than the eye can
follow, and broken into lovely grottoes and holes and canals, through
which small resplendent fishes of the brightest blue or gold flit
fitfully between the lumps of coral. The sides of the natural grottoes
are entirely covered with endless forms of tender-coloured coral,
but all beautiful, and all more or less of the fingery or branching
species, known as madrepores. It is really impossible to draw or
describe the sight.”
Equally impossible was it to photograph these fairy grottoes, “seen
through twenty feet of surging water,” though some snapshots were taken
in moments when the vast billows withdrew themselves.
One difficult question in connection with coral reefs has been--How can
they rise, as they do, out of considerable depths, when coral-polyps
cannot live below some twenty fathoms from the surface?
Two chief explanations have been offered, each of which has been warmly
taken up and defended.
One meets the difficulty by means of the theory of a rising and sinking
earth-crust. A mountain-top might have been first heaved up to within
twenty fathoms of the surface. Then later, while the polyps were
building upon it, the mountain might have slowly sunk. In that case the
polyps below would die, as the water deepened; but the wall of dead
coral would remain, reaching in time very far down.
The other explanation also admits that coral-reefs have been generally
built upon sub-ocean heights. But it supposes that height to have been
partly raised by volcanic forces, and afterwards built up to the needed
height by a growing collection of oozes and animal-remains, deposited
through ages.
Many proofs have been found in recent years of the probable truth of
the latter theory. Still, it does not of necessity do away with the
earlier explanation. Here, once more, the question may be asked--Why
should not both be true? If some submarine peaks have been lifted to
just the right level by gradual building up of sediment, others may
have been so raised by volcanic action or crust-crinkling.
Either way, it is a marvellous tale.
Thousands of miles of solid reef-rocks; hundreds of substantial
inhabited islands, all reared, inch after inch, by a mere “gelatinous
slime,” by soft-bodied jelly-like creatures, first cousins to the dull
though pretty anemone of our shores!
The thing sounds incredible! A stranger from some far-off world--a
stranger even from polar regions on our Earth, unlearned in the lore of
warmer oceans--might scout the story as absurd.
Yet no fact in Natural History is better attested, or stands on a
firmer foundation. There is a good deal more in the philosophy of this
small world than appears at first sight.
CHAPTER XVII.
OVER THE OCEAN-BED
“The wrecks dissolve above us: their dust drops down from afar;--
Down to the dark, the utter dark, where the blind white
sea-snakes are.
There is no sound, no echo of sound, in the deserts of the deep,
O’er the great grey level plains of ooze, where the shell-burred
cables creep.”--RUDYARD KIPLING.
By way of variety, shall we take a little excursion together, you and
I, into those under-sea regions of which so much has been said in past
chapters? Regions which the foot of man has never trod; which the eye
of man has never seen; which, except in death, the hand of man has
never touched.
Shall we leave behind the fair Earth that we love, the sunshine, the
bright sky, the fields and hedgerows, the blue sparkles of Ocean’s
surface, and go down and down, through a waste of lonely waters, till
our feet rest upon firm ground below?
“Eh, but it’s eerie!” we might say, were we of Scots descent. Sunlight
is at once lost sight of, and twilight deepens fast.
A heavy cyclone may be raging above, but the troublous turmoil soon
ceases to affect us. Stormy billows, with their showers of spray,
cannot disturb the calm of these depths. As we sink lower, we find
ourselves enwrapped in stillness. A creeping current is around us, yet
with movement so gentle that we are not aware of it.
During the early part of our descent we come across innumerable
sea-weeds; delicate floating red fronds, and long brown ribbons tangled
together.
Presently we pass through a sticky slimy mass of Diatoms, reaching far
to right and left, and of great depth. Untold millions of those tiny
vegetables are living and growing together, in one enormous floating
bank.
Now we have reached the “hundred-fathom limit,” and as we go beyond it,
we find marked changes from the life we have known above.
No seasons here. No variations from summer to winter, from spring to
autumn. Only one dead level of perpetual chill, becoming colder and
colder.
No light here. No variations from night to day, from evening to
morning. Nothing but continuous midnight blackness, unrelieved by the
faintest gleam of sunshine.
No plant-life here. No ocean-weeds of any kind. Those things we have
left behind us, far above.
Dead sea-weed fronds are indeed abundant, sinking slowly downward,
in company with ourselves; and dead Diatoms, with dead microscopic
creatures of many kinds, rain incessantly from the surface waters to
the ocean’s bed. But they are far too minute for us to feel them, as
they slip noiselessly past. _Seeing_ anything, small or large, is out
of the question.
No light; no waves; no colour; no beauty. Only unbroken stretches of
silent water, with intense and penetrating cold.
A mile or more below we find ourselves on firm ground. This is the
topmost peak of a sub-ocean mountain range, rising from the bottom
of the sea. In the darkness we grope our way to the verge, then
slowly walk down its sloping side, under a ponderous weight of water,
while our feet are upon a sticky unpleasant ooze, which seems to be
everywhere.
Only not quite everywhere. The nature of the ocean-floor varies.
Here, for instance, we come to a patch of hard ground, reaching some
little way. But the sticky ooze mainly prevails, varied by less sticky
mud. And neither ooze nor mud is always of the same description, as
we should discover if we walked far and examined specimens from each
district. There are muds and muds--oozes and oozes.
Crabs in abundance scuttle over the ground, as we may know by feeling,
if we have left our boots behind. And slimy creatures of various kinds
flourish, none of them precisely the same as those which inhabit our
sea-beaches in regions of light, yet their near relatives. Stooping
down, we touch a rough-coated hedgehog; and then our fingers come into
contact with a mass of slimy tentacles, which sting sharply.
One would like to be able to see, as well as to feel. But into these
depths no gleam of sunlight may ever penetrate.
Yet, as we stroll onward, plodding through the thick plastic ooze, in
the pitchy darkness we become aware of a light, a hazy light, drawing
near.
One does not expect to find a lantern down here in the deep
ocean-waters. It positively seems to be a lantern, moving as if it had
a will of its own. And about the small living lantern, during its
approach, we see many creatures congregated, swimming and whisking
round, evidently making use of the glimmer to catch their prey.
When it has come close, we find the light to proceed from a soft-bodied
jelly-like animal, which, as it travels, carries its own illumination
with it. Had we in upper regions such power to shine for ourselves, we
should be delightfully independent of artificial light after dark.
At first our impression is that the sub-ocean lamp must be a very
uncommon phenomenon. But as we go on we encounter another and
another--different indeed in species, yet alike in the possession of
natural light-giving organs.
It dawns upon our minds gradually that, even in ocean-depths, the law
of compensation is not unrepresented. Even those dark regions, cut
off though they are from all rays of sunlight, do not lie under total
midnight blackness unrelieved. Even here, in these desolate nethermost
parts of the ocean, creatures with eyes may live, and may find a good
use for those eyes.
For glimmer after glimmer is seen; and jelly-like animals under our
feet, when accidentally touched, give forth rays, sometimes rays of
many colours; and fishes, as they flash past, lend occasional gleams;
and larger uncouth monsters do the same--all helping to light up a
world beyond reach of the sun.
Talk of depths! We are in them at last, and no mistake. Down--down!
Deeper and deeper! Above our heads are piled three or four miles of
water, and the pressure upon our unfortunate bodies is terrific.
Here creatures of simplest form abound,--Protozoa, or First Animals,
tiny jelly-like specks, mere living cells, too small by far for us to
see, even with the help of animated deep-sea lanterns, unless we have
carried with us a powerful microscope. But we know them to be there.
The ooze and mud alone, when carefully examined, prove the fact.
Here are foraminifera, living and dead; and skeletons of reef-coral,
all dead; and specimens of deep-sea coral, both living and dead;
and remains of bigger creatures innumerable, which have disported
themselves in the waters above. Yet not so many of these last as one
might have expected, because of the destructive power of sea-water.
There are also plant-like zoophytes, and disc-shaped jelly-fishes.
There are sea-urchins and starfishes. There are sponges in great
numbers, wandering young ones and old ones settled down for life, once
looked upon as vegetables, now known to be animals. There are molluscs
of various kinds. There are long slimy wriggling worms. There are the
inevitable crabs, large and small. There are countless fishes swimming
about, not in the least embarrassed by the astounding fact that they
have something like three and a half miles of water between them and
fresh air and sunlight.
[Illustration: DEEP-SEA FISHES
_Face page 182_
]
Unexpectedly we come upon a great ship, lying where it has lately sunk.
The busy sea, always busy even when most quiet, is hard at work
demolishing the structure of the vessel; though still in the darkness
we can feel the tall mast, the solid sides, of the noble craft, which
once floated buoyantly far above, in light of day. Now it reposes on
the ocean-bed, never again to be of service to man. Its race is run;
its tale is told. Alas! good ship! which, but for one fatal storm,
might still be actively engaged in its country’s service.
But we find no human remains. If they be there, our searching has
failed to alight on them.
Small wonder, in the great space and the blackness. A medusa gleam of
light has little power to aid us in this search.
Perhaps slow currents have carried elsewhere the bodies of men who went
down with the ship. Or perhaps the bones have succumbed already to
the destructive working of ocean-waters. Or perhaps all on board were
saved, when the gallant vessel sank. Let us hope that it was so.
We are leaving the sticky ooze and getting into a region of stiff
clay. If there were light enough, we should find it to be of a reddish
tint. Here we do find bones--remains of creatures of a higher class,
though not of man, the highest of all. Here are sharks’ teeth in great
abundance, and many earbones of whales. Not much, after all, but
something that tells of Life.
Another lofty mountain height under water, rising from the ocean-bed.
Shall we climb it, and see whither it may lead us? Have we not had
enough of these black mysterious depths?
Now up and up, cautiously feeling our way and using any such glimmers
of living light as we come across. By-and-by we find ourselves getting
into shallower water. Evidently this sub-ocean mountain approaches near
to the surface. It will not end, like the last, a mile or more beneath.
Here is a region of solid limestone rocks, made of reef-coral, which
has been ground and pounded by the waves, and afterwards cemented
firmly together. We are getting into levels where the waves have power.
Presently the firm limestone is exchanged for coral mud, and later that
gives place to reef-sand. By this time we have around us, not only
living animals but living sea-weeds, which fact tells of our nearness
to sunlight. It may still seem dark to us, but some light must be able
to filter through, or plant-life could not exist.
A few more fathoms of ascent, and we too are aware of light--dim and
faint at first, yet steadily increasing.
Shall we step out into the fresh air, the radiant sunshine, of a
South-Sea coral island--into a world of light and life and beauty,
all the fairer and the sweeter in its contrast with those gloomy
under-ocean regions through which we have been wandering?
CHAPTER XVIII.
MULTITUDINOUS LIFE
“This great and wide sea, wherein are things creeping innumerable,
both small and great beasts.”--Ps. civ. 25.
“The dense immensity
Of ever-stirring Life, in thy strange forms
Of fish and shell and worm and oozy mud.”--KINGSLEY.
Some thirty or forty years ago the knowledge which man had of the
“Great Deep” was practically _nil_.
We know a good deal more now, thanks to the famous voyage of the
_Challenger_, and to many other observations, though still the full sum
of our information is small compared with the much that we do not know.
In the year 1872 the good ship _Challenger_ quitted British shores for
her long tour of discovery. During nearly three years and a half she
cruised about the world, dipping her instruments into the water at
frequent intervals, measuring the depths, studying the temperatures,
making note of other conditions, and bringing up from the ocean-bed
materials whereby to judge of the state of that dark nether-world,
hidden from our eyes by intervening miles of water.
Three and a half years of steady work; hundreds upon hundreds of
soundings; thousands upon thousands of miles traversed; tens of
thousands of specimens hauled up; days and weeks and months devoted to
unremitting study of those specimens! This is what the _Challenger_
Expedition meant. No wonder our knowledge of the Under-Ocean has grown
by leaps.
And yet no wonder it is still confined within narrow limits. So
enormous is the extent of the Ocean,--so few comparatively are the
parts which have been under close examination!
Imagine a monster giant striding with vast steps over the sea, and at
intervals of a mile or two dipping a long arm into the depth, to bring
away a handful of whatever might lie upon the bed below. No doubt he
might and would thus learn a good deal that he had not known before.
Still, at the best, tens of thousands of square miles would lie around
in all directions, untouched by his searching fingers.
This is very much what the Expedition was able to do. A handful here
and a handful there was brought up, as a specimen of what might be
found below. But tens of thousands of square miles, to north and south
and east and west, remained untouched.
None the less, from these occasional “dips,” however few by comparison
with reaches not examined, we know far more than our forefathers could
have dreamt of as within the bounds of possibility.
Instruments, many and complicated, are used in deep-sea researches--far
too many and too complicated to be described here. Two or three may be
mentioned.
Sounding-machines proper are largely employed, sometimes carrying
water-bottles, and always brass tubes, weighed down by “sinkers,” which
remain behind when the tubes are drawn up full of mud or ooze.
Small dredges are dragged along the sea-bottom, gathering whatever may
lie there loosely, and bringing it to the surface.
Trawls also are necessary, with beams from ten to seventeen feet in
length. Such trawls, held by strong steel cables thousands of fathoms
long, can often lift seven tons of material.
Into the bottom of a dredge-bag and of a trawl-net fine cloth is
frequently sewn, so that mud and small animals may not slip through and
be lost.
[Illustration: DRAGGING THE TOW-NET TO CATCH MINUTE SURFACE ANIMALS
Note sailors with small nets]
[Illustration]
[Illustration: BEAM-TRAWL AND TOW-NET EMPLOYED IN DEEP-SEA RESEARCH
_Face page 188_
]
Immense supplies have been thus dredged and hauled up from the
bottom of the sea. Muds and oozes, sands and pebbles, stones and
rocks, shelly deposits, volcanic deposits, remains innumerable of
dead plants, remains still more abundant of animals, including
earbones of whales and teeth of sharks, and more rarely other parts
of animal-skeletons--large, small, microscopic, these all have been,
with infinite care, with infinite patience, sorted and examined and
classified.
Teeth and earbones! But where are the great shark-skeletons? Where are
the mighty bone frameworks of whales?
If a whale’s earbones lie here, surely here also must have sunk
the enormous carcase. Yet all the rest has vanished. All has been
dissolved--disintegrated--eaten up, as it were, by the black and silent
waste of water. Sea-water has an extraordinary dissolving power, much
intensified by added pressure at great depths, and few substances can
long withstand that power. Not even the massive skeletons of sharks
and whales, with the exception of the teeth and earbones, which are
formed of peculiarly hard material.
And never once, throughout the whole cruise, was any single bone of Man
brought up from the ocean-bed.
After all is this surprising? Where even whale-skeletons are mastered,
small chance can remain for a human skeleton to stand out long against
absorption.
The marvel is how tiny foraminifer shells can last as they do. The
majority no doubt disappear. Unless they reach the bottom quickly, and
are there covered up and protected, they must soon be dissolved.
Yet that vast numbers do thus escape we know by the masses of ooze
found over the sea-bottom; by the fifty millions or more of square
miles of the ocean-floor carpeted with coral muds and sands, and with
oozes of foraminifera and kindred shells.
Only down to a depth of about two miles. Beyond that, carbonate-of-lime
shells are seldom found. It is believed that these light shells take
as much as three or four days to sink one mile; and in about two miles
they all succumb to the power of sea-water. But the hard little diatom
cases are present in all depths, more especially in Earth’s colder
regions, where they abound most freely.
The ocean-bed has been described as one huge sepulchre, full of the
remains of once-living creatures. And this is true; yet by itself it
gives a very one-sided view. Not less is the ocean-bed to be described
as a world of abounding Life.
Everywhere, throughout the whole sea, in all parts, above and below
and between--near the surface, on the floor, in all intermediate
reaches--living creatures flourish in numbers past imagination.
Not everywhere equally. Here may be found a wonderful richness of
animal-life. There the explorer may alight on a barren region. Yet even
those parts more scantily supplied need not be always thus. Living
creatures in vast hordes, in enormous companies, drift to and fro, rise
upwards and sink downwards; and the district which to-day seems almost
devoid of life may to-morrow be thronged with active beings.
The Ocean’s inhabitants have been roughly divided into three Classes--
Deep-Sea Life, Intermediate Ocean Life, and Surface Ocean Life.
The first of these includes all animals which crawl upon the sea-bed,
or which live within about three hundred fathoms of it.
The second includes all animals which live between about three
hundred fathoms of the sea-bottom and three hundred fathoms of the
ocean-surface.
The third includes all animals which live within three hundred fathoms
of the surface, and those on shallow shores.
By far the greater number of living creatures appear to inhabit the
surface regions; and it may be that the next in number are those on and
near the ocean-bed. This, however, is uncertain. It is difficult to
judge about the intermediate depths. All creatures living there must be
extremely good swimmers, and they are very shy of nets.
We cannot readily picture to ourselves the manner of life which goes
on in those intermediate parts. Creatures there have, as it seems,
no connection with either the ocean-bed or with shallow shores--no
resting-place to which they may turn--in short, no home. Though one may
not realise the fact, few animals within our ken have not something in
the shape of a home, a _pied à terre_, to use a familiar term, though
that “terre” may be under water.
The very idea of a life spent always in swimming or floating through
boundless depths, never touching firm ground, having no kind of home or
retreat, suggests vagabondage, and sounds disconsolate.
It may be that the difficulty is at least partly met by those great
floating banks of living creatures which are often found.
Diatom-Banks have been already spoken of. But other animals of larger
growth also band together, forming vast companies. To each individual
in such a congeries the Floating Bank would be a home. It would matter
little to that individual whether the bank as a whole floated here or
drifted there, whether it rose at night to the surface of the sea, or
whether in daytime it sank lower to escape from the sun’s glare.
Many such banks of life belong strictly to the Surface Class rather
than to the Intermediate. But the want of a home applies equally to all
creatures who live a free and roving life in the Ocean, unattached to
shore or to sea-bed, whether they live above or below the three-hundred
fathom limit.
Another puzzling question has been as to how deep-sea creatures are
fed.
In Life on _terra firma_, generally, the work of plants is to make
ready food for animals. Many substances, which are needful for
animal-structure, cannot be taken in by them until broken up and
re-made by plants. And plants can only carry out this task in sunlight.
Where the light of the sun fails, there plant-life fails also.
But direct vegetable food is not always necessary. Arctic
animals--bears, seals, walruses,--cannot get it except at second
or third hand, through the bodies of other animals. Perhaps this
was forgotten by some who maintained that no animals could, by any
possibility, flourish in ocean’s greater depths.
Numberless observations have now thrust that theory on one side. By
the dredgings and trawlings of the _Challenger_, not to speak of later
explorations, it has been conclusively proved that, even down to great
depths, animal life is marvellously plentiful.
Two or three examples may be given. A single haul, made in water more
than a mile deep, brought up animals of two hundred different kinds.
Another haul, in a depth of two miles, had the same result. Another, in
a depth of three miles, brought up fifty different kinds. All these it
was known, by tokens learnt from close study and much experience, had
certainly lived near the bottom. Again, from depths of four miles many
creatures, including fishes, appeared. Even in a depth of over five
miles, signs of life were not lacking.
Who, after this, may venture to name a depth at which Life is
altogether impossible?
Although plants cannot live and grow in the darkness of nether ocean,
their decaying remains are incessantly raining downward from higher
levels. Animals in the intermediate parts, and perhaps also near
the sea-bed, can feed largely upon these falling sea-weeds. Immense
quantities are doubtless snapped up _en route_; but many also reach the
ocean-floor undevoured, since vegetable-remains often figure in the
muds and oozes brought up thence.
Deep-sea animals are very extensively eaters of mud and ooze and clay.
It does not sound like appetising fare, or what our grandparents used
to describe as “palatable.” But the palate of a deep-sea fish or crab
differs from that of a man; and since no better vegetable-food offers
itself, they are probably content.
That the said creatures do really subsist in a measure upon such
materials, is known for a fact. When drawn up to the surface, they are
found often to have their stomachs full of the mud or ooze or clay
which in that particular place carpets the ocean-bed.
Even in far shallower waters, not much removed from the “hundred-fathom
line,” though still beyond the region of living sea-weed, crabs dredged
up are found to have indulged freely in the same frugal rations.
There is of course no difficulty as to animal-food in any depth. The
fight for life goes on below, as above; and the weaker succumbs to the
stronger, or the less cunning to the more subtle, in the deep as within
reach of sunlight.
CHAPTER XIX.
OCEAN FLOWERS AND LAMPS
“These are the works of the Lord and His wonders in the Deep.”
Ps. civ. 24.
“Every track
Was a flash of living fire.”--COLERIDGE.
“We have already learned,” wrote Albert, Prince of Monaco, not long
since, in reference to recent Ocean researches--“that a whole world
of Fishes, Molluscs, Annelids, Medusæ, Cephalopoda, and Crustaceans,
come to the surface at night, and return before day to a depth of some
hundreds of fathoms, forming a living tide which ebbs and flows in
every sea.”
Letting alone for the moment other creatures mentioned in the above
list, let us think about the vast world of MEDUSÆ--of JELLY-FISHES and
their relatives--with which the Ocean is largely peopled.
Whether Hydroids, Jelly-fishes proper, Coral-polyps, or Sea-Anemones,
they all belong to a low order in the Animal Kingdom. Higher,
certainly, than the minute specks of life described in past chapters;
higher than Foraminifers; higher than Sponges; but lower than
Sea-urchins and Starfishes; very much lower than Worms and Oysters.
They vary immensely in size, ranging from minute jelly-bags, without
limbs or heads, mouths or stomachs, to great masses of jelly-like
substance, with eyes and mouths and powerful stinging apparatus.
All these are included in the circle of near relatives to the “Medusæ,”
which name was first bestowed upon the anemones from a supposed
likeness between the snaky tresses of the mythological Medusa and the
tentacles of these soft-bodied animals.
“Ocean-flowers,” many of them may truly be called, since they live
and grow, rooted like a plant to one spot; since also they put forth
veritable buds and blossoms. Only they are in nature not vegetable, but
animal. Many of these ocean blooms are exquisitely beautiful; but they
may not always be gathered with impunity.
“Ocean-lamps,” too, many may with truth be named. Large numbers of
the coral-polyps, large numbers of the hydroids, and perhaps all of
the free-swimming medusæ or jelly-fishes, carry with them their own
little lanterns, wherewith at night to make bright the surface of the
sea--wherewith also to bear glimmers of light downward into those black
depths where sunlight cannot reach.
That Jelly-fish which “swam in a tropical sea,” and said, “This world
it consists of ME!” must have been an unusually intelligent specimen
of its kind. Jelly-fishes in general are not credited with even much
bodily sensation, far less with mental originality.
Coral-polyps have had their meed of attention in an earlier chapter.
There is a near relationship between the reef-builders of equatorial
seas and the anemones of British sea-beaches. But the anemone is
a creature of distinctly higher development than the co-operative
coral-polyp. It has at least the great gift of individuality, which its
reef-cousins have not.
Sea-anemones have been compared to garden asters, and indeed the
resemblance is not slight. The living tentacles of the one might almost
be taken for a rough copy of the thick petals of the other.
In general form sea-anemones are round soft disc-like bodies,
surrounded or trimmed by a border of fleshy tentacles, and mounted on
a thick fleshy stalk or cylinder, which is usually either fastened to a
rock or buried in the sand.
They vary in size between half-an-inch and more than a foot in
diameter. A splendid specimen, to be found in the Pacific, is fourteen
inches across the disc.
These creatures are not without a limited power of moving from place
to place; though, in the case of most “attached” anemones, movement is
extremely slow. A few kinds do not attach themselves at all, but rove
freely through ocean-waters, after the fashion of their cousins the
jelly-fishes.
One particular species, which seems to approve of change of scene, and
yet not to love exertion, has hit upon a clever dodge.
When quite young it fixes itself upon the shell of a certain kind of
crab; and as it grows larger, it gradually covers the whole back of the
crab. Where the crab goes, the anemone goes; when the crab rests, the
anemone rests. Oddly enough, the crab does not appear to object to his
burden.
This is no mere accidental comradeship, seen only in rare cases; for
that special description of crab is never seen without its friend the
anemone perched confidingly upon its back; and that special description
of anemone is never seen without its friend the crab for a steed.
A sea-anemone, like a coral-polyp, has a mouth and a stomach. But
unlike the coral-polyp, it has the mouth and stomach for its own use,
not merely in trust for the benefit of the whole community.
When the pretty flower-like creature wishes to open itself out, it
takes in a quantity of salt water. When it wishes to shut itself up, it
spurts the water out, drawing its tentacles close.
Both mouth and stomach are elastic; and it is able to swallow animals
that are very little smaller than itself. Sometimes it gulps up
greedily a whole crab or bivalve, digesting the soft animal parts, and
getting rid of the useless shell as easily as it gets rid of water,
when about to close.
Soft and mild and helpless as a sea-anemone may seem, it is really far
from being defenceless.
Within that plump body, around the mouth, in the skin, about the
tentacles, and along the slender hanging white cords, lie concealed
thousands, even millions, of weapons. Each weapon is a very fine and
delicate thread of hollow make, curled tightly up in a minute cell,
ready for use. When a sea-anemone desires to injure or to kill, either
in defence or in attack, it darts out a number of these little “lassos”
as they are called.
Each lasso is not merely unwound, but is actually turned inside out,
as you may turn a stocking inside out, when drawing it off. And as the
instantaneous process takes place, poison flows with the tiny dart into
the wound that is made. Small though each lasso may be, when dozens or
hundreds of them are launched together, the result is not contemptible,
even as regards man; and ocean creatures die fast from the poison.
A cell which contains a lasso is about one five-thousandth of an inch
across; and two hundred lassos, placed end to end, would reach to about
an inch in length. When once a lasso has been darted forth, it can
never again be used, because it cannot be returned to the cell. But so
great are the supplies of them, that a sea-anemone never gets to the
end of its armoury. Even if all were used, others would speedily grow
in their place.
Some kinds of animals, living in the sea and of service to man, are
in danger of being thinned out of existence by the incessant ravages
of net and trawl, of hook and harpoon. Not so the world of Anemones.
So vast are their numbers, so rapid is their increase, that no
antagonistic forces can annihilate them.
It has been said that if every anemone on British shores were one day
swept away, carried off by an army of ardent naturalists, or destroyed
by waves in some tremendous tempest, the next inflowing tide would
bring a fresh supply, sufficient to fill all gaps.
Not less numerous, perhaps far more numerous, are the countless hordes
of Jelly-fishes, so called, though they are not fishes--of Sea-nettles,
so called, though they are not nettles.
They travel freely through the ocean depths, like fishes; and they
sting sharply, like nettles. Yet they are neither.
Another name given to them is that of “Sun-fishes,” because in calm
weather they often float close to the surface of the sea, as if
delighting to bask in sunshine. One could almost imagine that, after
the fashion of modern “luminous paint,” they are taking in sunlight,
to carry stores thereof later into dark depths, for the benefit of
less favoured comrades. But let a heavy storm arise, and swiftly these
fragile creatures wend their way into the placid depths, beyond reach
of wind and wave.
Many years ago a story was told of a certain farmer, who had heard that
medusæ were particularly good as manure. He had large supplies of them
carted to his land, with much expense and trouble. Not till later did
he learn how small a part of the creatures consisted of anything but
water; how easily he might have had the whole mass of them dried, and
then carried by hand, at almost no cost.
Medusæ, as earlier stated, are of all sizes, from tiny translucent bags
of liquid to huge discs of jelly-like substance, rivalling a man’s
umbrella in diameter.
They are also of all kinds and shapes. Many of umbrella-shape have,
in place of a handle, bundles of fleshy tentacles hanging down below,
and thin streamers reaching to a length of a hundred feet. Some are
more like saucers or bowls. Others of longer and narrower make have
been likened to large thimbles. Some are ribbon-like beings, moving in
graceful serpentine folds. Others have the outlines of elegant tubes.
Many, again, are like little inverted delicate shrubs, or fairy-seaweed
fronds, hanging downward. Some carry sail upon the surface of the water.
While all are of a more or less jelly-like substance, some are so
frail and watery that they can only be lifted out of the sea in a pail.
Any other mode causes them to drop to pieces.
But the most wonderful and beautiful characteristic of the jelly-fish
is that of its self-illuminating power.
Here is a description of one kind, found in the Atlantic, near the
coast of North America:--
“Objects of more exquisite beauty than some of these hydroid-medusæ do
not perhaps exist. Each minute crystal chalice, with its beautifully
curved outline, elongated delicate tentacles, gently coiling and
uncoiling, and its slender proboscis which hangs like a lamp in the
centre, lighting it with a soft phosphorescent glow, is the very type
of delicate beauty, suggesting the wonders of fairyland.”[4]
[4] J. S. KINGSLEY.
And here is another description, no less striking; not this time of a
floating medusa, but of a small coral-zoophyte, about ten inches long,
common in the Mediterranean and in the Atlantic:--
“Nothing can exceed the beauty of the elegant opaline polyps of this
zoophyte when fully expanded, and clustered like flowers on their
orange-coloured stalk; a beauty, however, almost equalled by night
when, on the slightest irritation, the whole colony glows from one
extremity to the other with undulating waves of pale green phosphoric
light. A large bucketful of these Alcyonaria was experimentally stirred
up one evening, and the luminosity evolved produced a spectacle too
brilliant for words to describe. The supporting stem appeared always
to be the chief seat of these phosphorescent properties, and from
thence the scintillations travelled onward to the bodies of the polyps
themselves.”[5]
[5] _Corals and Coral Islands_, by DANA.
Travellers in all ages have described the marvellous illuminations
seen at night on the ocean surface; illuminations long a mystery to
those who gazed with admiration. At times the whole sea is one blaze of
light; and the ship cleaves her way through liquid silver, or crimson
glory, through milky whiteness or flames of blue and red.
And the greater part, if not the whole, as we now know, is due to
uncountable multitudes of jelly-creatures, floating close to the
surface, each contributing its tiny share to the radiant sheen.
Sometimes they are large enough to be visible to the naked eye, but
more generally they are minute microscopic beings, far too small
individually to be seen by us, yet apparent in the mass by their united
brilliance.
If millions of their glowing lamps shine in ocean’s deeper parts,
we need no longer marvel to find deep-sea animals with large and
well-developed eyes.
While on this subject, it should be added that the Medusæ have not a
monopoly of ocean-lamps. Other creatures share in the task of lighting
up those midnight depths.
Not long since two new species of fishes were discovered off the
Azores, both of which possessed delicate organs of light-giving power.
In one of them the rows of tiny lamps could be used or hidden “at
will”--allowed to shine upon the world around, or shut off by a thick
dark skin, somewhat after the fashion of a policeman’s “dark lantern.”
Cuttlefishes too have been found carrying natural lamps for sub-ocean
use.
CHAPTER XX.
ARMOURED MYRIADS AND MONSTERS
“The Sea hath its Pearls.”--LONGFELLOW.
“From out thy slime
The Monsters of the Deep are made.”--BYRON.
Among the multitudinous hosts of living creatures which throng the
Ocean, vast hordes are furnished with some kind of protective armour,
the better to take their part in the ceaseless warfare for existence.
Though the armour differs widely in different kinds of animals, they
offer one and all a great contrast to the soft jelly-like Medusæ.
Starfishes and Sea-urchins, for example, are guarded by tough or
hard skins, with actual plated armour and sharp prickles. Limpets
are sheltered behind single firm shields, and in any moment of peril
become instantly glued by suction to a rock. Oysters dwell within stout
bivalve shells. Hermit-crabs carry with them empty purloined shells,
of other creatures’ construction. Crabs and Lobsters wear strong
suits of sheltering armour, joined together bit by bit, as knights and
squires of old were clothed from head to foot in the many “pieces” of a
mediæval soldier’s military suit.
The armoured hosts belong to various divisions in the Animal
Kingdom,--starfishes and sea-urchins to one; limpets and oysters to
another; crabs and lobsters to a third. And all three, together with
microscopic jelly-specks and sponges and coral-polyps and medusæ,
belong to a much greater Division, which embraces all “Invertebrate” or
Backboneless creatures.
If they have not backbones and ribs, they have skeletons of a kind.
Only, as a general rule, the skeletons lie outside or are visible
through the transparent body, instead of being hidden away inside, as
in most fishes.
The prickly-skinned starfishes and sea-urchins are familiar objects
with most of us.
Both belong to a Division in the Animal Kingdom which is well above
the level of jelly-fishes. Both have arms or rays, proceeding from
a central disc. But in the starfish the rays are separated; in the
sea-urchin they are joined together.
Starfishes and sea-urchins are able to move and even to travel, though
in most cases with extreme deliberation. Both can put out little
tube-feet suckers, by means of which they can change their position,
and can even slowly right themselves, when turned the wrong way up.
Sometimes the sea-urchin uses its sharp spines as an additional means
of getting along. And while the common starfish can seldom advance
faster than at a rate of about one half-inch per minute, there is a
species which flings itself forward in a more reckless and rapid style,
by using its rays as limbs.
Starfish and sea-urchin are alike protected by an armour of hard
little plates, arranged in neat rows upon the skin. Not plates made in
a workshop, and purchased by the owner for its use, but unknowingly
secreted by the animal itself; formed, like Foraminifera shells, from
lime drawn out of the water.
Between these plates are tiny openings; and through those openings are
put out the minute tube-feet. Even in armour made by skilled workmen
for human beings, joints have always been necessary; and we know from
history how many a gallant fighter in past centuries was slain by an
arrow piercing where a joint allowed it to enter.
Certain members of the immense Worm Family, living in the sea, wear
protective scales and bristles; but these can only be named in passing.
The great MOLLUSC Family is found throughout the whole Ocean, from sea
to sea, from shore to shore, from the surface to the utmost depths. It
includes numberless subdivisions, and enormous varieties in shape and
size, in colouring and kind. It contains millions of the tiniest little
fragile shells, such as those described by the poet in well-known
lines:--
“Slight, to be crushed with a tap
Of my finger-nail on the sand.”
It contains also the giant clams of southern seas, the hugest bivalves
ever seen, one pair of which may weigh five hundred pounds.
A Mollusc is usually a soft-bodied creature, with a so-called “foot,”
a nervous system, a mouth, a “mantle,” and a protecting one-valve or
two-valve shell.
The “mantle”--a peculiarity of this family--is a curious loose fold of
the skin or wall of the body, wrapped round like a mantle. From the
“mantle” is formed or secreted the hard shell, largely composed of
carbonate-of-lime. In the shell itself there are no blood-vessels,
there is no actual life; and it cannot grow, as the creature within it
grows. Yet in a sense it grows, since by the addition of constant fresh
layers to the edges it becomes larger and larger, thus accommodating
itself to the increased size of its inhabitant.
Mollusc shells are of all imaginable shapes and kinds; and often they
are of extraordinary beauty.
Sometimes they are thick and hard, so as to refuse the passage of
light. Sometimes they are so thin as to be translucent. Sometimes they
are exquisitely pearly or iridescent. The latter effect, seen in the
mother-of-pearl lining of oyster shells, is due to enormous numbers of
most fine and delicate lines, close together, which reflect and break
up the rays of sunlight, much after the manner of a prism.
Perhaps in the whole Mollusc Family none of the members are so
interesting to man as the oyster--partly as a much-relished food,
partly as the manufacturer of pearls.
Among gems worn by women few are fairer, none more emblematic of purity
and grace, than these. Yet, so far as relates to any intention on the
part of the oyster, any idea of forming that which is lovely and
valuable, no thanks whatever are due to the producer.
An oyster makes pearls simply for its own convenience. As in the case
of other bivalves, if any foreign substance happens to get inside
the shell, and cannot be pushed out, it is straightway covered over,
and thereby rendered harmless. Sometimes the intruder is a grain of
sand, sometimes a parasite. Oftener yet, it is an oyster-egg which has
proved a failure. In any event, the oyster promptly clothes it in that
beautiful material--pearl--which it secretes by nature, and because it
cannot do otherwise.
We know well enough the ordinary size of “edible” oysters. The
pearl-forming relatives are often much larger, having shells from eight
to twelve inches in diameter.
One does not commonly associate the idea of Mind with a Limpet. Yet it
appears that even limpets are not without the organ of locality.
Human beings, brilliant in other respects, are sometimes woefully
deficient in this quality. But a limpet knows what he is about as to
the geography of his own locality. He chooses his resting-place with
care, much preferring a smooth rock-surface to one that is broken or
dented. Then he clings fast, and the shell in its growth is studiously
adjusted to the outlines of that selected surface. When the limpet
“excursionises” in search of sea-weeds, vegetables being a needful
part of his diet, it is remarkable that he returns to the same spot.
Evidently he prefers his own home to new quarters.
These lower Molluscs have to be passed over quickly. A whole volume
might be filled in merely indicating the different species and
varieties of them.
At the top of the Mollusc ladder, cousin to limpets, whelks, oysters,
clams, and shell-fish innumerable, but in status far above them all, we
find the powerful Cuttlefish. A “fish” in popular language; yet no fish
truly, but a very highly developed Mollusc.
“Cephalopod” or “Head-footed” is the distinguishing name for this
sub-class of Molluscs.
Very unpleasant creatures they are to tackle--more particularly
those described by the familiar titles of “Octopus,” “Squid,” and
“Devil-fish.” More particularly too when an individual of large
dimensions has to be reckoned with.
The species that make their home near British shores seldom reach
any great size. They cannot for a moment be compared with the great
creatures of warmer climes; still less with the monsters of Ocean’s
depths. Yet it is not desirable to have a hand or a foot in their
tenacious grip.
Most of us have seen small specimens in an aquarium--evil-looking at
the best. Sometimes individuals of the large species visit us from a
distance, though they probably do not take up their abode by choice in
our neighbourhood.
The body of a cuttlefish, like the bodies of most Molluscs, is
enwrapped in a loose mantle, which in this instance is of strong and
muscular make, perpetually enlarging and contracting. From the one
opening in the mantle emerges the head, with two large eyes and a
mouth; and round the latter, which generally boasts a sharp beak like
that of a parrot, spring eight or ten long lissom powerful “arms” or
limb-like tentacles, each furnished with a row of suckers, which in the
smaller kinds look rather like buttons.
Through the opening at its neck the creature draws in and pours
out water--_breathes_ it in and out, in fact. When in repose, this
breathing goes on quietly and automatically. But if the animal wishes
to move, it forces the water out in a violent spurt through what
is called the “siphon,” always in a direction opposite to that in
which it intends to go. So great is the force thus employed that the
cuttlefish rushes with wonderful speed, often with lightning-like
rapidity, through the water.
While not protected by outside armour, like limpets and oysters, it
really does secrete a shell; but the shell is inside instead of outside
the mantle, stiffening the latter, though not protecting it from
injury. In its case, however, the weapons of offence are sufficient,
and there is less need for defensive armour.
In the cuttlefish we have a very tiger of the ocean, haunting vast
areas in numbers which cannot be calculated.
One or two kinds are known which prefer to live solitary lives, but
usually they herd together. Woe betide all weaker creatures where
they abound! Once caught in those powerful arms, within reach of the
fierce beak, no chance for them remains. Molluscs, crabs, fishes, all
alike fall victims to this ruthless destroyer. It is said that the
cuttlefish, like its striped prototype on land, will kill when not
hungry for the pure pleasure of killing.
The smaller species are a principal article in the diet of dolphins and
of codfishes. But the giants of the race would be in all cases too
much for these puny foes.
Even a Bengal tiger, however, may be mastered by an elephant; and the
mightiest of squids has to succumb before the yet mightier sperm whale.
“The monsters vast of ages past” received attention in a well-known
poem. But the monsters vast of ocean-depths in the present may surely
compete with them. Happily for mankind, these awful creatures do not
frequently come out of their “ocean-caves” to be interviewed.
Now and again one is caught, or is flung ashore by a storm, or its dead
remains are found and examined.
One huge creature, captured near Labrador, was reported to have a
body thirteen feet long, with arms reaching to a distance from the
head of thirty-seven feet. Another, left by the retreating tide on a
Newfoundland beach, had a body twenty feet long, and arms about the
same in length as those last mentioned.
But no more striking description has been given than that of Mr. Frank
Bullen, in his fascinating volume,[6] when he tells of the tremendous
midnight conflict between a large sperm whale and, surely, the
monarch of the squids, “almost as large as himself, whose interminable
tentacles seemed to embrace the whole of his great body.” The whale’s
head “seemed a perfect network of writhing arms,” and by its side
“appeared the head of the great squid, as awful an object as one could
well imagine even in a fevered dream, with immense black eyes, at least
a foot in diameter.” As the “titanic struggle went on,” the whale, “in
a business-like methodical way,” munched at his huge enemy, gradually
overcoming its resistance.
[6] _Cruise of the Cachalot._
Such a battle-royal as this is perhaps very seldom to be seen, even by
those who spend their lives upon the sea. It may be that these terrible
creatures rarely come to the surface, unless compelled to do so by a
hungry whale.
What they must be to the denizens of the deep, ever watching for
prey, or pursuing it with swift determination in the darkness--“every
cup-shaped disc of the hundreds with which the restless tentacles
are furnished ready at the slightest touch to grip whatever is near,
not only by suction, but by the great claws set all round within its
circle--and in the centre of this network of living traps ... the
chasm-like mouth, with its enormous parrot-beak”--all this and more
has been pictured by Mr. Bullen, from personal observation, in words
which cannot be strengthened. No tale of monsters in bygone ages can
well exceed it.
If further proof be needed of the part played by cuttlefishes in the
larder of Sperm whales, it is given by those whales, which, when
harpooned and in their dying agonies, throw up the contents of their
vast stomachs. Out of the stomachs come great masses of undigested
cuttlefish, cubic blocks many feet in diameter, swallowed whole and not
yet broken up.
In 1895 an immense cuttlefish was thus disgorged by a whale, and was
found on examination to belong to a new and unknown species. The head
had vanished; but the body was clothed in a strong armour of neatly
arranged scales. So this was veritably an “armoured” kind.
Another monster, ejected from the stomach of another whale, had great
suckers, each sucker being supplied with “claws as powerful as those
of a tiger.”[7] This last also had ocean-lamps, or “phosphorescent
organs,” doubtless a help to himself in ocean depredations, and an
added terror to myriads of fleeing fishes.
[7] _Geographical Journal_, Nov., 1898.
Yet neither strength nor speed, nor grasping arms, nor clinging
suckers, nor tiger-like claws, nor parrot-like beak, can protect the
cuttlefish against its supreme foe, the Sperm whale.
But it has a method of defence, or rather of escape, often efficacious
even here. When in danger, it is able to pour forth a copious stream of
black liquid, which so thickens and darkens the water around, that the
wily creature is hidden, and slips away beyond reach of its pursuer.
The nervous system of the Cuttlefish is more developed than that of
other Molluscs. Indeed, from the remarkable changes of colour seen when
it is excited, and the tubercles which spring to view on its skin if
it is made angry, one would be inclined to speak of its temperament
as “highly irritable.” It also shows much more understanding than its
cousins, the oysters and the clams.
CHAPTER XXI.
A GOODLY COMPANY OF CRABS
“The slimy bottom of the Deep.”--_King Richard III._
In all the wealth of Ocean-life, perhaps no creature flourishes more
abundantly than do Crabs and their relatives.
We still talk of Jelly-fishes, Starfishes, Craw-fishes, Cuttlefishes,
but no longer of Crab-fishes.
Once upon a time that name was equally common. Everything that had its
home in the sea was popularly supposed to be a fish. We know now that
not one of the above belongs to any Fish tribe; yet in Conservative
style we keep the old titles going.
Crabs and Lobsters, Shrimps and Prawns, are members of the vast
CRUSTACEAN division or family. They are so called on account of the
hard protecting _crust_, or armour, by which their soft bodies are
guarded. Chief and foremost among the numberless kinds included
under this head is the busy vigorous sidling Crab.
And very important animals are crabs, in the economy of the Ocean. Not
only from their enormous numbers; not only from the wide extents of
land and sea which own to their presence; not only from the fact that
they form a principal item of food to fishes and even to whales; but
also because at least one species is reckoned excellent eating for man.
There are land-crabs as well as sea-crabs. There are deep-sea crabs, as
well as shallow-water and shore crabs.
[Illustration: A DEEP-SEA CRAB
The holes in front are for the admission of water containing nutritious
animal food
_Face page 220_
]
There are crabs much less than half-an-inch across; and there are giant
Japanese crabs, carrying heavy back-armour or “carapace,” about a foot
in length and breadth, while the sprawling limbs extend to a yard and a
half or more on either side.
Those of ordinary sizes are found everywhere; in numbers beyond
reckoning. Not only in tropic waters, but in moderate climes, and in
frigid zones; alike near the poles and under the equator. Different
species, of course, in different parts, but all connected.
Moreover, they are quite as much at home in the depths of the sea, with
miles of water piled over their heads, as on shelving beaches near to
land.
During the _Challenger_ Expedition crabs were fished up from all
depths--from one mile, two miles, three miles, even between three and
four miles. In those dark and icy regions the cold must be great, the
pressure tremendous; still crabs innumerable are there.
Some sub-ocean kinds have displayed what may be looked upon as an
inquiring disposition.
A ship passing near the Azores brought up in a trap many large ones,
belonging to a then new species. And the curious part of the matter was
that not all of them need have come. Some were entrapped, and could
not get away; but others rose to the surface of their own free will,
clinging to the outside of the trap, and not attempting to escape, even
when drawn out of the water, and on deck.
Perhaps they were dazzled by the unaccustomed brightness of light,
after the few and feeble glimmers below. But the puzzle remains--why,
in the beginning, they should have chosen to leave their home, and
to journey upward into unknown regions? Were they of an aspiring
character? Had they friends caught in the net, from whom they would not
be parted? Or was the attraction merely that of the appetising food
which those friends were enjoying?
An interesting haul was one day made by the _Challenger_ while crossing
the Bay of Biscay; not indeed from a great depth, since the Bay is in
no part very profound, but from the sea-bed. More than five thousand
small sharp-clawed crabs came up in company; and they took quite kindly
to the new conditions of life on board. They cheerfully explored the
whole vessel, turning up in every direction, during the next few days.
Something in the nature of a love for home has been shown by crabs, at
least in one instance. Many years ago a singular story to this effect
was told in a scientific paper.[8]
[8] _Nature_, April 3rd, 1873.
The fishermen of Falmouth, capturing crabs off the rocks at Lizard
Point, brought them by boat to Falmouth Harbour, and kept them there
till needed, in a box sunk under water, some four miles out. Each crab
had been branded on the back with its owner’s mark.
By accident one of these boxes was broken; and all the prisoners made
good their escape. Naturally, no one expected to see them again.
But only two or three days later those very same crabs--with branded
carapaces--were caught anew by the fishermen; not near Falmouth, but as
before, off the Lizard. How they had managed to get there, how they had
first found their way to Falmouth Harbour, a distance of four miles,
and then for miles more along the coast, are questions more easily put
than answered. The word “instinct” fails to meet the difficulty.
One thing only is clear, that they preferred the neighbourhood to which
they were accustomed.
Very fearless creatures are small crabs, generally; brave, no doubt,
partly because of their numbers.
In nets and trawls, where animals of many kinds are together for long
hours of captivity, the weak are often destroyed by the strong, before
they can be drawn up.
But sometimes the weak combine together, and prove too much for the
strong. Notably this was the case, when a dog-fish, brought up from a
depth of over fourteen hundred fathoms, was entirely disposed of in
twenty hours by crowds of hungry little crustaceans.
Most of the crabs and lobsters, shrimps and prawns, which live on or
near the bottom, send their young ones up into higher levels for
education. There for a while the juveniles swim and develop, till old
enough in their turn to take to the ocean-bed. Great numbers have
meanwhile been preyed upon by multitudes of fishes in those upper
levels.
Crabs undergo curious changes in the course of their growth from
infancy to adult age. At certain stages they are so utterly unlike in
appearance to what they become later, that for a long while they were
classed by naturalists under separate names, being actually reckoned as
different creatures.
Since the protecting armour of a crab is far too rigid to admit of its
stretching, it becomes from time to time too tight for the growing body
within. When it can no longer be endured, it has to be cast off, and a
new suit, larger in size, has to form in its place.
This armour, like the shells of foraminifers, and the skeletons of
coral-polyps, is unconsciously secreted by the crab; and during the
formation of a new suit of armour the crab has a time of weakness,
of delicate health, and also of dangerous exposure to the attacks of
enemies.
Some kinds of crabs have sunk to the miserable level of parasites,
living on the exertions of others, and refusing to exert themselves.
One prefers to think of the active and independent and intelligent
kinds; and really, crabs have a good deal of intelligence. Quite as
much as an average insect; though perhaps few of them could compete in
an examination with ants or bees.
If any might do so successfully, it would be in all probability some
member of the Spider-crab family.
To this slender-limbed untidy class belongs the unwieldy Giant-crab
of Japan. But it is his smaller relatives who excel in sense. The
spider-crab has a slovenly appearance, because he attaches to himself
stray bits of sea-weed and scraps of sponge or other growths, with the
plain intention of becoming less easily seen.
He keeps to no regular or permanent style of adornment. The nature of
his trimmings depends entirely on the character of his surroundings.
Many years ago my father had been for a short dredging excursion, near
Worthing; and he brought home with him one of these small creatures,
elaborately ornamented with slim strips of bright-red sea-weed.
He placed the crab in a basin of water, which contained a supply of
green sea-weed. And next morning a change was seen. The crab had cast
aside his red ribbons, and had decked himself out with a smart array
of green ribbons instead. Such conduct may, if we choose, be accounted
for by the magic word “instinct;” but it certainly wears the aspect of
deliberate intention, and even of some dim consciousness of cause and
effect, not to speak of a knowledge of colour.
This habit of the spider-crab is now well known and recognised; and he
has been closely watched during the “dressing” process.
It has been noted that he always puts each slip of sea-weed or scrap
of sponge, or aught else that he uses for the purpose, to his mouth,
before fastening it to his body or limbs. A suggestion has been made
that his object in so doing is to lick it and render it sticky.
Perhaps in some cases it could not otherwise be attached; but many of
the spider-crabs have hooked hairs, exactly adapted for holding fast
such objects as they love to adorn themselves with.
Nor are the adornments always merely stuck on. Both sea-weeds and
sponges frequently take root, and flourish as healthy growths upon the
crab’s back. It is an extraordinary fact that the crabs seem to know
perfectly well from which kinds of sea-weed or zoophyte they may snip
off little bits, with a prospect of not killing them.
So unerring, indeed, is their knowledge in this respect, that, as an
authority on the subject has stated, “the keepers of Aquaria have only
to consult the crabs to learn what kinds of sea-animals will bear being
thus transplanted piecemeal.”[9]
[9] _Crustacea_, by STEBBING.
Is this too merely “instinct”?
Many a time baits were lowered in the nets of the _Challenger_ to
attract victims. Oddly enough, it was found that no more effective
bait could be used for crabs and their kindred than--pieces of
looking-glass! May one imagine that some friendly Medusa lent her
little glimmer, far below, to enable the Hermit-crabs, when putting on
fresh ribbons, to see their reflections, and judge of the effect? It
reads rather like a page of _Alice in Wonderland_.
Hermit-crabs or Soldier-crabs, having an insufficient protective armour
of their own, are in the habit of using empty Mollusc shells to shelter
that part of their bodies which is not guarded. One of these crabs,
when young, chooses a shell, fitted to its size; and when grown too
large for it, that shell is discarded in favour of a new one.
But whether the said crab commonly contents himself with an empty
habitation, the occupant of which has died earlier, or whether he first
kills and eats the live Mollusc, and then “commandeers” the shell, does
not seem to be known with certainty.
CHAPTER XXII.
THE WORLD OF FISHES
“He giveth food to all flesh.”--Ps. cxxxvi.
“Which giveth food to the hungry.”--Ps. cxlvi. 7.
A world abundantly peopled. A world which holds its myriads,
uncountable in kinds, beyond reckoning in numbers.
No part of the wide Ocean may be found where fishes are not, and in
places, at seasons, the water positively teems with them, so that
they may be said almost to hustle one another for want of space.
Fishes, taken by themselves, letting alone jelly-inhabitants and
shell-inhabitants and crab-inhabitants, would suffice to keep the whole
sea alive.
No picture of the Great Deep would be, even in the humblest sense,
complete without some little description of the world of Fish-life
contained therein.
But the subject is one of hopeless magnitude to be dealt with in a
couple of short chapters.
A mere list of the names and chief characteristics of the principal
“Orders” of Fishes, putting on one side the immense array of
“sub-orders” and “varieties,” would speedily outrun the limits of these
pages. Besides, such a list would be to the ordinary reader unreadable.
Natural History _savants_ have not troubled themselves to curtail
syllables in titles so used.
On land we have beasts and birds, which serve as food for man;
beasts and birds of prey; beasts and birds that are simply harmless,
attractive, pretty, or interesting.
In the Ocean also we find fishes good for food; fishes of prey; fishes
which may be classed as merely pretty, or curious, or remarkable.
This rough classification will do well enough for our present purpose.
Many fishes belong of course to more than one of the divisions. That
which is good for food may be also curious. That which acts as an ocean
“beast of prey” may be also beautiful.
The speed with which fishes can dart along is often very great.
Both fins and tails are used as a means of advance; and the smooth
scale-clothed skin glides with the least possible friction through the
water. No better form than the “boat-shaped” outline could be devised
for rapid progress in a heavy element.
Not only are fishes light in make, often weighing hardly more than the
water which upholds them; but also, unlike most backboned animals, they
are cold-blooded. A few deep-sea kinds have no eyes, though commonly
they can see and hear and smell well.
In the sense of feeling they are believed to be very deficient, and it
is doubtful whether they suffer any pain at all, in the true sense of
the word. Probably they can be conscious of discomfort.
One of their unfailing characteristics is the possession of a
stupendous appetite, and with it of a superlatively good digestion.
They live to eat; and they are at it incessantly. Perhaps in their
case it does not always mean greediness, but only a due satisfying of
Nature’s needs.
Certainly, as a race, they are not troubled with daintiness; and
if they love variety of fare, they can have the same with ease.
Pretty much whatever comes in their path is gulped down without
hesitation--“gobbled up in the twink of an eye.” Most of them, in
cannibalistic style, feed without compunction upon other fishes.
While they may be popularly said to “breathe water,” because they take
in water instead of air, they depend upon life-sustaining oxygen every
whit as much as do land animals, only in a different mode.
Large quantities of oxygen are ever present, dissolved, in the sea. It
is not the _water_ flowing through the fish’s gills, but the _oxygen_
dissolved in that water, which carries on combustion in the body, and
so keeps it in life and health.
The amount of oxygen thus obtained is small; therefore the combustion
is slow; therefore the blood is cold. But if, for a very short time,
all oxygen could be withdrawn from the ocean, the whole multitude of
fishes therein would fast die of suffocation. Sea-water alone, without
oxygen, could not keep them alive.
The gills are, however, so constructed that, while they can use small
supplies of oxygen dissolved in water, they cannot use large supplies
of oxygen forming part of the free air. So when a fish out of water
draws in atmospheric air, its gills become dry and useless, and it dies
of suffocation.
A world of rapid living and dying is this which we have now in view--of
killing and being killed--of an incessant struggle for existence.
Many of its inhabitants have no means of defence, save by flight; and
these feed only on beings weaker than themselves; largely on the vast
hordes of the young of crabs and jelly-fishes. Others are furnished
with formidable weapons, wherewith they can actively attack powerful
foes.
Cold-blooded though they be, and probably without the sense of physical
pain, they yet have their little range of emotions.
According to one thoughtful and competent observer,[10] they can be
frightened, they can be angry, they can endure pangs of jealousy,
they can be excited by a spirit of curiosity. And though one may
perhaps hardly go so far as to speak of “fishy” affection, shown by
one to another, yet some faint reflection of maternal anxiety seems
occasionally to exist.
[10] ROMANES.
They also display a real enjoyment of life, a pleasure in “being,” a
delight in playing with water and wave, and even a sportiveness, such
as one might imagine to belong only to creatures of a higher grade.
On the whole, the brain of a fish is better developed than the brains
of any other animals of low rank, excepting only that of the Cuttlefish.
Some instances have been known of tame fishes recognising, or
seeming to recognise, human beings. It is open to doubt how far the
“recognition” meant more than an expectation of something to eat,
following upon certain familiar sounds.
Fishes good for food--these are and have been through ages by far the
most important to man. Other kinds may be dangerous or interesting.
But without the “Food-fishes” of the Ocean the difficulties of feeding
mankind would be largely increased.
For they are always there. They come without exertion on our part. No
sowing, no digging, no tending of the waters, is needed to bring forth
the mighty harvest. Year after year, multitudes past imagination come
into existence, and any number of them may be had for the trouble of
taking.
All that man did in the past was his level best, by reckless
destruction, to kill the goose which lays the golden eggs, to
exterminate the creatures which are to him of so incalculable a value.
Of late years some steps have been taken in the other direction, some
efforts have been made towards the preservation of fish and the culture
of spawn. But much more remains to be done. The incessant use of line
and net and trawl through centuries has thinned the multitudes of some
species very greatly, and in the course of time they may even cease to
exist.
That the harm done thus far has not been far greater must be ascribed
to the enormous numbers of each kind, and to the vastness of those
ocean-regions, where they may at any time retreat beyond man’s reach.
For this we have to be thankful. It would be an ill day for us, on
which the chief food-fishes should fail.
Herrings, for example. What would the poorer throngs of our large
cities do, without that useful little cheap dish?
The amount of herrings caught yearly around British shores almost
exceeds belief. They appear often in mighty shoals, swimming closely
packed throughout a mile or more, being devoured as they swim, to the
tune of millions, and being captured by fishermen in masses.
Yet year by year the supply goes on, apparently undiminished.
One fisherman alone, at work near the French coast, reckoned that in
the course of a single night he had taken over five hundred thousand
herrings, half which he threw back into the sea. An unusual amount,
of course. But what must be the sum-total captured in a year by the
combined efforts of all fishermen?
In a year, however, a herring produces somewhere about thirty thousand
eggs. What, then, must be the sum-total of eggs produced by all
herrings in the ocean?
True, vast numbers of the eggs come to nothing; vast numbers serve
as food for other creatures. Yet enormous supplies escape countless
dangers, and succeed. Thus the poor man’s food is bountifully given, in
an ever-recurring harvest.
Among “Food-fishes” the “White” kinds are prominent, belonging mainly
to two large families. One of these families includes Cod, Whiting, and
Haddock. The other consists of Flat Fishes, such as Turbot, Halibut,
Sole, Dab, Plaice.
At the head of the first family stands the Cod, that most useful and
abundant creature, found throughout the deeper waters of northern seas.
During particular seasons the multitudes of cod are accompanied by
multitudes of cuttlefishes--rather singularly, since cuttlefish are
the favourite food of cod. But perhaps it would be more correct to say
that the cuttlefish are accompanied by the cod--the latter doubtless
going where they can find the food that they like. At these seasons
millions of cuttlefish are caught, to be used as bait, by means of
which enormous supplies of cod are taken for the market.
A calculation has been made that, in the course of a single spring, on
the banks not far from Newfoundland, something like one hundred and
twenty millions of cod are the result of combined British and American
and French exertions.
Happily, this fish also is very prolific. An individual often produces
three or four millions of eggs in a season; and as many as eight
millions have been found on one fish. Here, again, immense numbers of
the eggs fail to develop, immense numbers are devoured. Yet multitudes
come to perfection, and the ocean is still furnished with cod.
There is, however, a very serious danger, beginning to be recognised,
in the case of cod and yet more of some other “white-fish” kinds; and
this is that in time the reckless havoc worked may outrun even these
wonderful sources of renewal. Fishing has been carried on in the past,
without thought for the future. Little or no attention has been paid
to sparing the young; and the valuable roe itself has been used as an
article of food. Man may by-and-by have to pay dearly for his lack of
foresight and common-sense.
As an illustration of the numbers of fishes in the sea, a curious tale
is told about a deep-water kind of Mullet, known as the Tile-fish.
This particular species had not been discovered before the year 1879.
A few specimens were then taken from over a bank about eighty miles
from the coast of Massachusetts--large and brightly coloured. Near that
bank, where they had made their home, they could at any time be easily
caught.
But in the spring of 1882 a heavy gale took place; after which these
fishes were seen in enormous quantities, floating at the surface of
the water, covering a space of three hundred miles in length and fifty
in breadth. One who saw the singular sight reckoned that something
like fourteen hundred millions of them must have been there--enough to
have supplied every man and woman and child in the United States with
between two and three hundred pounds’ weight of fish.
In the following autumn, when fishermen went again to the bank for
tile-fish, they found none. Not a single specimen turned up. The
storm, probably by shifting the direction of the Gulf-stream and its
“cold wall,” had either destroyed them all, or had slain so many as to
frighten the survivors to a distance. In that particular district they
had not, when the story was written, been seen again.
CHAPTER XXIII.
SOME ODDITIES OF FISH-LIFE
“3 FISH. Master, I marvel how the fishes live in the sea.
1 FISH. Why, as men do a-land; the great ones eat up the little ones.”
PERICLES.
Of fishes which are remarkable for beauty names might be mentioned by
the hundred; alike of food-fishes, of powerful and fierce-tempered
kinds, and of those which may be described as purely ornamental. Not
all are graceful in shape; but vast numbers are exquisite in colouring,
especially when first drawn from the water. As they gasp out their
lives, the brilliant tinting fades.
Among harmless and lovely kinds, perhaps not many could vie with the
small radiant creatures of Coral-reefs, described by many a traveller
in terms which tell of a lack of sufficient variety in adjectives.
But words in these cases convey a dim impression of the reality.
Fish-beauty must be seen, and seen at its best, to be appreciated.
Among curiosities of Fish-existence, too many to name, a few may be
cited in passing.
Flying-fishes, with their blue bodies and wing-like fins of silver, are
well known to voyagers.
They rise from the water with a vigorous upward spring, which will bear
them to a height of fifteen feet or more above the surface; and there
they skim lightly along, with apparently thorough enjoyment. Sometimes
thousands are seen at once, all leaping out of their native element,
and taking to the air for a variety.
Often they do this to escape from a pursuing foe below; but the plan
is not always successful, since they have other enemies above. Many a
flying-fish in its aerial career is snapped up by a hungry gull.
One uncouth specimen is the “Frog-fish,” known also as the
“Fishing-frog” or “Goose-fish,”--a flat thick rounded creature, with a
cocked-up tail, an enormous mouth nearly as wide as its whole body, and
knowing eyes. It bears a certain resemblance to a frog.
Many instances are related of fishes “imitating” or “copying”--to
use very inadequate terms--different land animals. The Bat-fish, for
example, bears a curious likeness to a Bat. The Snipe-fish might be
mistaken for first cousin to a Snipe.
There is also the Pelican-fish, an inhabitant of deep-water. It has a
mouth of portentous dimensions, with a huge pelican-like pouch hanging
loosely below. Little is known of its habits; but it is supposed to
swim about near the ocean-bed, with its enormous jaws extended in a
stereotyped yawn, taking food in a vast and wholesale fashion.
Another oddity, known as the Spook, though not interesting in its ways,
has a most “bizarre” look. Its body is long and winding, almost like
that of an eel; its fins are large; its eyes are big; and, judging from
its picture, its head seems to be a cross between that of a fish and
that of a quadruped.
Among innumerable fish gormandisers one particular specimen carries off
the palm, and might win the first prize in a world-wide competition for
excellence in voracity.
The Black Swallower, most appropriately named, manages, at least now
and then, to accomplish the rare feat of swallowing a morsel many times
larger than itself. It is a fish of slender make; but after such a meal
the slenderness disappears.
It seizes upon a fish, perhaps six or eight times as large as its
own body, and “_gradually climbs over it with its jaws_”--a truly
marvellous exploit! Its mouth and stomach stretch elastically during
this process, till the whole of the large fish has passed inside the
little fish, and a vast pouch hangs below, filled with the meal just
taken. This bag is the distended stomach.
But the tale carries its own moral. The greediness of the fish--and
apparently it is a case of individual greediness, though it springs
from a family tendency--is punished as it deserves by death. As the
swallowed “mouthful” decomposes, it loads the bag with gases, like an
inflated balloon; and like a balloon the stomach acts, bearing the
unhappy victim to the sea-surface, where it floats wrong way up. A
sufficiently tragic ending!
A stout-built animal is the Wolf-fish, varying in length from three
to seven feet; and in his ways a veritable “wild beast,” powerful and
savage, with strong jaws, teeth fashioned like those of a tiger, a
vicious temper, and a ferocious scowl. An abnormal appetite too is his,
though hardly equal to that of the Black Swallower. In Maine these
brutes have been known to attack fiercely human beings wading in the
sea at low tide.
Sometimes the above is called also the “Sea Cat-fish;” but true
Cat-fishes belong to quite another family; and they can hardly
be described as more desirable acquaintances. With their solemn
Grimalkin-like expression, their love of fighting, their sharp serrated
spines, with which they can give most painful wounds, the Cat of the
Ocean is not likely to be transformed into a domestic pet, for at least
some time to come.
These two last quarrelsome creatures may lead us from “interesting”
specimens of Fish-life to those which have been roughly classed above
as “Fishes of Prey.”
Prominent among the latter stands the dreaded Shark. In common parlance
we speak of a shark as a fish. Yet scientifically the description is
incorrect. Sharks and Skates are now looked upon as apart from Fishes
proper, being described rather as “Fish-like Vertebrates,”--not true
fishes.
One very marked difference is found in the numbers of their young.
With true fishes, as already shown, eggs are produced in enormous
quantities. But with sharks and skates, only one or two or at most
a very few young ones are brought into existence at a time, as with
higher animals.
If among wild beasts of the Ocean cuttlefishes represent tigers, then
perhaps we may say that sharks represent lions or panthers. But the
reputed nobility of the lion is never found in sharks.
Fearsome creatures they are; often huge in size, long-shaped,
flat-tailed, with cavernous mouths, cruel teeth, immense strength,
and bloodthirsty dispositions. Cannibals too, since they feed largely
on lesser fishes. To the bigger kinds a human being is merely a tasty
morsel, which may be disposed of in two snaps and a couple of gulps.
Though exclusively inhabitants of the salt sea, they sometimes chase
their prey into a river, putting up with fresh water for the nonce.
Sharks are found nearly all over the world, but much more abundantly
in hot climates. Their numbers gradually diminish, farther and farther
from the equator. In tropical waters they are often present in
overwhelming multitudes; and a man who should venture to bathe in such
parts, would be as a scrap of bread flung to a horde of hungry little
fishes. In less than a minute nothing of him would remain.
Off Kurrachee, where the catching of them is systematically carried
on, about forty thousand are slain every year. This is for the sake of
their fins, from which gelatine is obtained for the Chinese. That so
many are killed, as a regular thing, says much with respect to the vast
hordes which are _not_ killed.
Of small shallow-water sharks, the most widely known are varieties of
Dog-fishes. Though not large enough to be a terror to man, they are an
endless trouble to fishermen, destroying great numbers of captured fish
in the nets, and biting off the hooks from fishing-lines.
Among larger species, one kind found in the North Atlantic is the huge
mild-mannered Basking Shark, which at times lies long and lazily close
to the surface of the water, in company with a school of comrades.
Its teeth are unimportant, and it feeds on smaller creatures, not
attempting to include man among its eatables. But since it often has a
length of thirty feet, and, like most sluggish natures, is capable of
being roused, it becomes dangerous when excited. A blow of its tail may
easily smash in the side of a whaling boat.
The largest of these creatures is the vast Whale-shark, belonging to
the Indo-Pacific Seas, sometimes over fifty feet in length, and stated
even to reach seventy feet.
However, if accounts be correct, this giant is much less of an enemy
to the whale than the Greenland Shark. In the fashion of some savage
nations, the latter feeds deliberately upon the live whale, biting raw
steaks at pleasure from the worried leviathan--“scooping and gorging
lump after lump,” so long as it feels “dispoged.”
The Greenland Shark is credited with feeling no pain, and it is
extremely difficult to kill, as the unfortunate whale attacked by it
finds to his cost.
Worse than all, so far as human beings are concerned, are the famous
Man-eating Sharks of tropical waters, which occasionally, but not very
often, find their way to colder latitudes.
Among them, the Great Blue Shark, from fifteen to twenty-five feet
long, and the awful White Shark, known sometimes to reach a length of
thirty-seven feet, have an undesirable pre-eminence.
These monsters are furnished with teeth, the reverse of “unimportant.”
In shape they are generally triangular, serrated, and sharply pointed.
In arrangement they occupy rows, the foremost only of which is in
actual use. Other rows are folded back and kept in reserve, to be
brought forward when required. Thus a shark is never without a ready
supply of his formidable weapons.
White sharks are much given to keeping in the wake of ocean-ships,
on the look-out for scraps thrown overboard. One such persistent
follower having been killed, an inventory was made of the contents of
its stomach, as follows--“A tin can, a number of mutton bones, the
hinder quarters of a pig, the head and forequarters of a bull-dog, and
other and smaller things, as the auction-bill says, too numerous to
mention.”[11]
[11] _Standard Natural History_, ii. p. 83.
Closely related to the Sharks are those savage creatures known as Rays
or Skates.
The larger number of them live usually at the bottom of the sea, in
somewhat shallow waters, lying on the ocean-floor, or swimming about
just above it. Thus they do not so often come into contact with man as
do sharks. But it is want of opportunity, not want of will, which keeps
them from doing harm. When they have a chance they seldom fail to use
it.
Among different branches of the “Ray” division is found the tropical
Saw-fish, with its long sharp teeth-laden snout, ever ready to fight
the whale. In youth the saw-fish has a strong resemblance to a shark.
Then there are the Sting-rays, with barbed spines, a mere touch from
which causes a man terrible suffering, as if from poison; while a
severe sting may end in death. These are found in South America.
There is also the family of Torpedo Rays, quite distinct from the
better-known South American Electric Eel, but able to administer
electric shocks strong enough to render a man for the time helpless.
They are found in many waters--large creatures, rounded in shape,
smooth-bodied, thick, with longish tails.
Worst of all are the huge ungainly Eagle-Rays and Sea-devils, with
their powerful grinding teeth. These grow to an enormous size; and the
larger ones are quite capable of upsetting a big boat. Nor would they
hesitate so to do, if attacked.
One such creature was said to be fifteen feet in breadth, with a tail
several feet long; another to have been twenty feet in length; another
to have been three or four feet in thickness; another to have weighed
well over twelve hundred pounds; another to have needed fourteen
oxen to drag its dead body. They sometimes share with Cuttlefish the
distinction of being called “Devil-fishes.”
These monstrosities are found off Barbadoes, off Jamaica, and in the
tropical waters of the Atlantic and Pacific.
A particularly vicious kind hovers about the Pearl Fisheries near
Panama, to the terror of the divers. The creature is reported to fold
its vast “wings” about any unfortunate man within reach, and then to
devour him. This answers to the usual method of ground-rays in feeding.
They glide _over_ the object they wish to devour, settle down upon it,
hold it fast by the grip of a broad and heavy body, and deliberately
tear it to pieces.
CHAPTER XXIV.
BEHEMOTHS OF THE OCEAN
“There is that leviathan, whom Thou hast formed to take his pastime
therein.”--Ps. civ. 26, R.V.
“Canst thou draw out Leviathan with a fish hook?
Or press down his tongue with a cord?
Canst thou put a rope into his nose?
Or pierce his jaw through with a hook?”--JOB xli. 1, R.V.
From the company of hungry merciless Sharks and their relatives, an
easy transition carries us to the largest of Ocean-inhabitants--the
Whale.
Not that sharks and whales belong to the same division in the Animal
Kingdom. Not that they have aught in common beyond the possession
of great size and power. But because of that size and power, they
naturally come together at the close of a sketch of Ocean Life.
Sharks, if not in every respect to be regarded as fully and entirely
Fishes, are yet in most essentials “fish-like.” But Whales belong to a
higher level.
When we reach Whales we leave lower animals behind us; we step upon the
uppermost rungs of the Ladder of Life; we are in the society of Mammals.
At the bottom of that ladder we found microscopic beings, specks of
living jelly, so minute as to be invisible, so primitive as to be
without development, without separate organs. At the top of that ladder
stands Man; far more than animal, by virtue of his mental and spiritual
being; and yet an animal, by virtue of his bodily development.
The physical part of a man marks him as a Mammal. To Mammals belong all
Quadrupeds; but not Birds, not Reptiles, not Fishes.
A whale is not a fish. He is a Mammal. He is warm-blooded. He breathes
air through lungs. He--or rather, she--feeds the young of the race, as
they are fed by quadrupeds and human beings on land. A whale-mother
will fight to the death in defence of her little one.
Nor is the whale the only Mammal of ocean-waters. To this highest
division of backboned creatures belong also the Porpoise, a near
relative of the Whale; and the fierce Walrus, met often by Arctic
travellers; and the gentle Seal, with its pathetic human eyes, and its
warm soft coat, for the sake of which it suffers too frequently cruel
treatment at the hand of man.
Many different kinds of whales inhabit the sea,--such as the Rorqual,
the Hump-backed, the Ziphoid. The two which are most widely known, and
which may be regarded as foremost though unconscious rivals in human
favour, are--the Right Whale, of higher latitudes, and the Sperm Whale
of tropical regions.
[Illustration: A BLUE WHALE
_Face page 254_
]
There is a Right Whale of Atlantic waters, closely related to the Right
or Greenland Whale of Arctic Seas, though in some respects different.
But the Greenland Whale may be taken as the typical specimen of its
race.
And a mighty creature it is; often fifty feet, and sometimes sixty or
seventy, in length. A ribbon passed belt-wise around that massive form,
at its thickest, would need to be something like forty feet in length.
So the Right Whale does not boast a slim waist.
The enormous head, with its capacious cavern of a mouth, takes up about
one-third of the whole body.
An individual of this size weighs some seventy tons. And yet so light
is its make--partly due to the construction of its bones, partly no
doubt to its great lung capacity--that it actually weighs less than
water, and can with the utmost ease float close to the surface.
Indeed, a Greenland whale seldom by choice wanders very far below.
He much prefers to come up and breathe every ten or fifteen minutes;
though, when fleeing from the deadly harpoon, he has been known to stay
under water at a stretch more than three-quarters of an hour. But this
is exceptional.
At the top of the head are a couple of “blow-holes,” through which,
when he rises to the surface, he breathes.
In colouring he is black above, white below. A skin about one inch
thick covers enormous masses of fat, more than a foot in thickness; a
fine warm blanket to guard him from cold, but also, unfortunately for
the whale, an attraction to human beings, for the sake of the oil which
it yields. The outer skin is often thickly overgrown with masses of
barnacles.
Perhaps the most singular thing about this great creature is that
it has no teeth, and that it feeds in consequence upon the lightest
possible fare.
In place of teeth, inside the mouth are massive fringes of whalebone
plates, side by side, smooth on the outer side towards the lips, but
covered within by long dense supplies of hair. Similar horny plates
depend from the roof of the mouth. Since the plates of this “baleen,”
as it is called, are often ten or twelve feet long, and amount in
number to many hundreds, one cannot but imagine that the whale’s mouth
must be packed unpleasantly full of furniture. But they have their use.
As he swims he holds his mouth habitually open--somewhat after the
fashion of the Pelican-fish--and into the vast cave flow multitudes of
small creatures of every kind and description.
Presently a good supply has been collected, all lying on the enormous
tongue, a mass of flesh often as big as a room, some eighteen feet long
by ten wide.
He then nearly closes his jaws, and forces out the water. But the dense
hairy fringes hold back the living creatures, which he proceeds to
swallow. After which he again goes forward, open-mouthed, as before.
In a good many respects the Sperm Whale is a contrast to the Greenland
Whale.
He too is of leviathan-like dimensions; generally from sixty to seventy
feet in length, and not more slender as to his waist. But only the male
Sperm boasts these proportions. The female is, by comparison, a dainty
little being, seldom more than thirty or thirty-five feet long.
A Sperm has one spout-hole, instead of two; and in colour he is black
above, grey below.
In his outlines a marked difference is visible. Looked upon sideways,
the form of the huge square head is precisely like the trunk of an
immense forest tree, cut off short; and the “blow-hole” is situated
close to the end or front of this “truncated” head. The latter is
really a reservoir, containing a large supply of valuable spermaceti
oil, for the sake of which the creature is killed by man.
Instead of a mouth full of hair-fringed “baleen,” these whales have
proper teeth, better suited, one would think, to their size. Their food
too is of a far more substantial kind.
It was told in an earlier chapter how Sperm Whales live mainly on
cuttlefishes; and how sometimes, in midnight combat, they fight and
conquer even the mightiest of those loathsome monsters of the deep.
Sperms are found through wide ranges of the ocean, in most tropical
waters, as far north and as far south as 60° in each direction from the
equator.
But whereas Right Whales of colder seas prefer to hunt in couples
only, Sperm Whales crowd together in large companies. Sometimes, it is
true, lonely specimens are found. They, however, are usually morose
and ill-conditioned brutes, ready to fight even men. It has been
suggested that perhaps they are thus solitary _because_ of their morose
temperament, which has made it impossible for their fellows to put up
with their presence.
Both these huge whales have powerful fluked tails and small flippers.
It is curious that inside the flippers are separate branching bones,
not unlike the bones of a human hand, only covered with thick skin in
one piece, like a fingerless glove.
This rather seems to indicate that the flippers may be of the nature of
hands in embryo.
The Sperm does not come to the surface for air nearly so often as
his Greenland cousin. Regularly once in each hour and ten minutes is
the plan he follows; and then he remains for several minutes at the
surface, going through a series of sixty or seventy mighty puffings and
blowings. After which he vanishes for another hour and ten minutes.
Some pathetic tales have been told of the devotion of a mother-whale to
her infant--she usually has but one at a time.
Early in the present century a harpooner deliberately sent his harpoon
into an infant-whale, hoping thus to take the mother. And he had not
miscalculated the strength of maternal love.
No thought had that poor mother of saving herself by flight. She came
fearlessly close to the boat, seized her wounded little one, and
dragged it away with extraordinary rapidity, using up six hundred feet
of line.
Then she rose again, dashing to and fro in such evident “extreme
agony” that one can only marvel at the men who were able to watch it
unmoved. Two harpoons were flung at her, and failed to strike. A third
succeeded; but still, absorbed in her little one’s peril, she paid no
heed to her own injury, made no effort to get away, and “in the course
of an hour” she was killed.
That was in 1811. The same deed has been lately described by Mr.
Bullen--the slaying of a mother-whale, which, with her infant by her
side, refused to use her great strength in self-defence, lest she might
hurt that little one. Such love as this should surely be respected,
even by rough fishermen.
If not in pity to the whale, another reason would suggest the same
line of conduct. The folly of recklessly slaying the rising generation
is beginning to be apparent. Already the supply of whales threatens to
run short.
Although one may speak of “little ones,” and although they are
genuinely “little,” compared with grown-up specimens, one must not be
led astray by the term. One very young baby-whale, when measured, was
found to be about twenty feet long. A fine strapping infant!
CHAPTER XXV.
“DOWN TO THE SEA IN SHIPS”
“With Ships the Sea was sprinkled far and wide.”--WORDSWORTH.
“Fair is our lot--O goodly is our heritage!
(Humble ye, my people, and be fearful in your mirth!)
For the Lord our God Most High,
He hath made the Deep as dry,
He hath smote for us a pathway to the ends of all the Earth.”
RUDYARD KIPLING.
With Whales we have reached the highest class among Ocean creatures.
Yet it is impossible to end here. Some few pages must be given to those
among men who “go down to the Sea in ships,” who “do business in great
waters.”
Not that in any sense can Man be reckoned as an inhabitant of the
“Mighty Deep.” But thousands of men spend the greater part of their
lives upon the Deep; tens of thousands more continually pass and repass
over its surface.
In the beginning of history ships became soon a necessity, partly as a
means of going from place to place along the coasts or of travelling
to other Continents and Islands, and partly for the purpose of catching
fish. Those early vessels were crude and ramshackle affairs, from a
modern point of view.
Unclothed and woad-stained Britons, ancestors to the Welsh of our
day, had their boats, wood-ribbed and skin-covered, or osier-framed
and hide-clothed. Rickety constructions at the best. Yet in them
half-savage sailors went over the stormy Channels, to Ireland and to
France, and even ventured into the Bay of Biscay.
Enterprising Romans, with better ships, did more; and before the close
of the First Century they had made their way round Great Britain. No
light feat this, in days when lighthouses and buoys existed not; when
the geography of sand-banks and rocks was unknown.
The boats in which our Saxon and Viking ancestors came to invade the
wild little Island of Britain, though of light structure, were superior
to the primitive British skiffs; and in the contest which followed they
had the upper hand.
Later on the Danes, with vessels sixty or seventy feet long, built of
heavy timbers and rowed by thirty men apiece, proved in their turn
too much for Saxon resistance, at a time when the Saxons had become
established as the people of the Island.
King Alfred, of noble memory, coming to the throne, found his country a
prey to these marauding Danes. He then and there grasped the principle,
which still has sway in England’s counsels, that the very existence
of Britain as a Nation rests upon the strength of her Navy. With all
possible despatch he had a new fleet built, composed of vessels which
were for the most part double the size of the largest Danish boats.
They were longer, wider, stouter, and were rowed each by from forty to
sixty men.
The first Naval battle which followed may be looked upon as a
foreshadowing of Trafalgar; for the English boats gained a complete
victory over those of the enemy, and thereby England obtained command
of the sea.
In those times no clear distinction existed between war-ships and
merchant-ships. All were prepared to defend themselves when need arose;
and any might be used, either to carry fighting-men, or to convey
merchandise.
Not until the reign of Edward I. did a difference grow up, separating
those vessels which as a rule kept to more peaceful occupations,
merely fighting in self-defence when attacked,--and those vessels which
devoted themselves to aggressive warfare. From that date, gradually,
the Royal Navy grew into being.
Even in the time of Queen Elizabeth the separating line was not very
marked.
There _was_ a Royal Navy, which took its share in repelling the Spanish
invasion; and the whole of that Navy in tonnage was far from equalling
one huge ship of modern days, the _Celtic_, White Star Liner.
Of the hundred and ninety-seven vessels, however, which met the vast
array of the Armada, only thirty-four were in any sense strictly
Men-of-War; and of those thirty-four one alone was over a thousand tons
in weight. The remaining hundred and sixty-three were Merchant-ships,
fitted up as best they might be for warlike purposes; most of them
being under four hundred tons.
But no mistake existed about the way in which these pigmies set to
work, like bulldogs, to worry the great Spanish ships.
Century after century the Navy grew, adding in each generation to its
size and strength. English sailors found their way hither and thither,
in the interests of their country, for war, for exploration, for
purposes of trade, discovering unknown lands, penetrating towards the
North Pole, mapping out the Ocean.
Other Nations took their part in these explorations, and the honour
of finding a New World did not rest with our ancestors. But in more
recent days the Lion’s share of research has undoubtedly fallen to the
British; and the coast-lines of the world have been surveyed and mapped
out chiefly by ships of the British Royal Navy.
Up to the beginning of the Nineteenth Century, all vessels, small or
large, moved by means of the wind or by oars.
Then began a change of immense importance, due to the use of steam for
carrying ships across the sea, not only with but in the teeth of the
wind.
This method took hold and prevailed, though at first very slowly. Even
in the present day hosts of merchant-ships still travel by means of
sails only, making systematic use of the Trades and other steadfast
winds. When time is not a prime consideration, sailing is of course
far cheaper than steaming. On the other hand, the carrying power of a
steamer is about three times that of a sailing-vessel of the same size,
since it can generally perform three journeys in the same time that a
sailing-vessel can manage one.
All over the world, in every sea, are thousands upon thousands of ships
of every kind and description, night and day speeding onward, each to
its destined port. Lines of Passenger-ships regularly plough the main,
starting on fixed days, and seldom failing to arrive on fixed days.
Merchant ships innumerable follow certain routes, going from country
to country over the Ocean, carrying the world’s produce. Mighty Navies
of war-vessels, huge in bulk and terrible in possibilities, rest like
sleeping leviathans upon the bosom of the deep, or steam from point to
point with resistless energy.
All this denotes a wonderful change since the days, when a few
roughly-made boats used to creep round the coasts of a few inhabited
countries.
Wide though the ocean be, with thousands of miles of water unbroken
save by occasional islands, the number of ships now always at sea is
so great, that the perils of collisions are much increased. But this,
of course, is chiefly in the more frequented routes, not in Ocean’s
lonelier wastes.
Definite rules are laid down for the avoidance of collisions. When two
vessels meet, each must steer “to the right.” All ships have to carry,
after dark, two powerful lights: a green one on the starboard or right
side; a red one on the port or left side; and in the case of steamers,
a white light also must be seen upon the mast.
The gradual development of ships, in the course of centuries, from
rude skin-covered coracles to top-heavy mediæval vessels; from them to
the stately Wooden Walls of Old England,--and, lastly, to the massive
Ironclads of the Empire; is full of interest. By far the more rapid
part of this development was witnessed in the years of the Nineteenth
Century.
Perhaps a slight comparison between past and present sizes of ships may
be worth giving.
To begin with Passenger Vessels.
In 1829 the Cunard wooden paddle steamers, of about two hundred tons,
perhaps from one to two hundred feet in length, carrying sails as well
as using steam, and able to advance at the rate of eight knots an hour,
were counted good enough for the Atlantic.
By about the middle of the century the same Line had taken to
screw-steamers, built of iron, some three hundred and forty feet in
length, of four thousand tons burden, and able to get along at the
rate of twelve knots.
In 1893 steel-built vessels replaced the iron-built; the length had
grown to four hundred and seventy feet; and the speed had increased to
seventeen or eighteen knots.
The _Celtic_, mentioned above, launched in 1901, of over twenty
thousand tons, is seven hundred feet in length, and though not equal to
many modern ships in speed, can do her seventeen knots with ease.
The same advance was seen in another line of steamers, plying their way
to and from the Cape.
Before the middle of the century, ships two hundred feet in length, and
going at the rate of seven knots an hour, were reckoned sufficiently
up to the mark. _Now_ vessels five hundred feet in length, steaming at
a pace of twenty or more knots, are in use. One cannot but question
how long it would have taken, under the old _régime_, to transfer two
hundred thousand soldiers from Great Britain to South Africa. Under
the new order of things that feat was lately accomplished in less than
eight months.
The same steady growth is apparent in Merchant vessels generally--in
their gradual increase from small to large, from slow to fast.
Again, the same development is seen in Men-of-War.
Up to the year 1860, twelve or thirteen knots for the best speed of a
battleship was regarded as eminently satisfactory. By 1870 this had
risen to nearly fifteen knots. There for many years it stood still; but
since 1880 the outside speed of battleships has arrived at nineteen
knots.
Fast Cruisers have exceeded the Battleships. Up to 1870 they had
reached nearly nineteen knots; and since 1880 they have risen to
twenty-three knots. These, again, have been excelled by Torpedo
Destroyers, which can go at the rate of twenty-six or twenty-seven
knots.
Together with increase of speed has come growth in size. A modern fast
Cruiser has often from ten to fourteen thousand tons displacement; a
modern Battleship from thirteen to fifteen thousand tons.
But the popular notion, that Men-of-War exceed in size and weight
all Passenger and Merchant vessels, is a delusion. It arises from a
difference in the mode of measurement.
The “tonnage” of a Man-of-War refers to its actual and literal weight.
The “tonnage” of a merchant-ship refers to its space for goods or
passengers--its “carrying power,” in short. The two can no more be
fairly compared by mere figures, than could a measurement by pounds and
one by quarts.
Many a first-class merchant or passenger ship actually weighs more and
exceeds in length the largest battleship. With the latter, size and
space cannot be the principal aim, but rather strength and endurance,
with speed.
A vessel lately constructed may have a most important bearing on
warships of the future.
This “turbo-motor,” as it is called, with a new kind of engine, has
reached the unexampled speed of thirty-four knots an hour; and there
seems to be no reason why in time it should not do much more. Such a
success threatens to revolutionise the life of ships at sea.
Thus far British ships have been mainly spoken of; and naturally so.
Not only because a British subject might be expected to put them first,
but because of their enormous preponderance in numbers and tonnage over
the ships of all other Nations.
American and German merchant-shipping has, it is true, of late years
made huge strides; and the last thing to be done is to underrate
their diligence and energy, or to wish them non-success. Yet still
we, Children of the Empire which dominates the Ocean, must desire our
Empire to hold her own, must strive our utmost to keep ahead of all
competitors in the race.
Perhaps not everybody realises how far ahead we have been up to the
present day.
Other nations indeed have made great advance. What the future may mean
for them and for us, Time alone can show. But as yet they do not seem
likely to outstrip us, unless Great Britain grows lazy and lies upon
her oars.
In the year 1900, the Merchant Shipping of the whole world, including
all vessels of more than one hundred tons, was reckoned to amount in
round numbers to over Twenty-eight Thousand Ships, and in burden to
over Twenty-nine Millions of Tons.
Of that vast world-fleet Eleven Thousand vessels were British. And
since the British ships were, on an average, larger than the foreign
ships, it meant that _nearly one-half of the tonnage of the whole
world’s merchant shipping sailed under the Red Ensign_.
To put the matter differently. In 1892 another reckoning was made;
the comparison being expressed by numbers, for the Merchant-Navies of
several Nations. It stood as follows:--
The Merchant fleet of Italy was taken as slightly over One. Then, in
proportion, the French fleet was represented by something over Two; the
Norwegian, by the same; the United States, by Three; the German, by
something over Three; and the British, by something over Twenty-two!
This included the whole tonnage or carrying power of the fleets in
question, both sailing and steam-driven vessels.
The figures speak for themselves.
Or, again, let us take all the steam fleets of the world, reckoning
only vessels over one hundred tons, and only those used for
merchandise; not Men-of-War.
These steam-fleets shall be pictured in our minds or on paper by
broad black lines, one-tenth of an inch wide. Now let us see how long
such lines would have to be, at two different dates, for a few of the
leading fleets.
In the year 1889 they would have been given thus:--
Japanese.--Less than one-tenth of an inch long.
American.--Three and a half tenths of an inch long.
French.--Four and a half tenths of an inch long.
German.--Six and a half tenths of an inch long.
And next, after a great dividing gap--
British.--Fifty-one tenths of an inch, or over five inches long.
Once more, the figures speak for themselves. But this was a good many
years ago. Let us have the same plan repeated for the year 1897, or
eight years later, noting the advance made in each case.
Here, again, the tonnage of the whole steam-driven fleet of each Nation
may be represented by a black line, one-tenth of an inch in width, and
varying in length according to the size of the particular fleet. Some
changes have taken place in those few years. The Japanese, instead of
being quite at the end of the list, rank above the Spanish and the
Norwegian; and the Americans have outstripped the French.
The results now stand thus:--
Japanese.--Nearly three-tenths of an inch.
French.--Five-tenths of an inch.
American.--Over five-tenths of an inch.
German.--Over a whole inch, or more than ten-tenths.
And once more, after another big dividing gap:--
British.--About sixty-seven tenths of an inch; or over six inches and a
quarter.
We hear a good deal of the rapid growth of the German and American
Merchant fleets, and not so much of the growth of our own. Yet
certainly we have not stood still.
According to the above comparison, which is taken from an American,
not a British report,[12] we have not held our own badly during recent
years. British transport has actually grown the most. True, we have
merely added sixteen tenths to an already great length; whereas, in
the same period, the German fleet, adding three and a half tenths, has
nearly doubled itself, and the Japanese, adding about two-tenths, has
trebled itself. But a very small amount is easily doubled or trebled;
and the nearest is still a long way behind the British total.
[12] _Merchant Marine of Foreign Countries_, vol. xviii.
This should not be allowed to induce a spirit of over-confidence,
which might probably mean in time the tortoises overtaking the hare.
And although our Merchant fleet is still almost the double of all
other Merchant fleets upon Earth put together, yet the proportionate
difference has begun to grow less than it once was. Other countries are
straining every nerve in the race; and if Great Britain would keep her
present position, this is no time for slackening of effort.
Powerful though our Royal Navy undoubtedly is, it has not that vast
preponderance over other Fleets of War which our Merchant Navy has over
other Mercantile Fleets.
The aim generally set before Great Britain of late years has been to
make and to keep the Royal Navy strong enough to be able to cope with
any two other War Navies existing.
But if we had a War Navy proportioned to our Merchant Service, which
might seem only reasonable, it would have to be nearly equal in tonnage
to _all_ the other fighting Navies in _all_ the world.
Is our present aim high enough, in view of the tremendous interests,
the enormous risks, involved?
CHAPTER XXVI.
AN EMPIRE: OCEAN-WIDE
“This Royal throne of kings; this sceptred Isle;
This earth of majesty; this seat of Mars;
* * * * *
This happy breed of men; this little world;
This precious stone, set in a silver sea.”
_King Richard II._
“Never was isle so little, never was sea so lone,
But over the scud and the palm trees an English flag was flown.”
RUDYARD KIPLING.
“See what a glorious throng they come,
Turned to their ancient Home,
The Children of our England.”--LEWIS MORRIS.
Deep down under the sea, on the sloping ocean-floor, amid dead
vegetable and animal remains, lie strange snake-like forms. Not natural
creations, but made by man and placed there for his own benefit.
Up to the year 1840 anything in the shape of a submarine telegraph was
not only non-existent, but, so far as is known, it had not even been
thought of.
Some wild dreams may have been indulged in here or there; but if so,
the dreamers kept their dreams to themselves. On land the electric
telegraph was getting into wider and wider use. The bare idea, however,
of so uniting lands separated by the ocean had not been brought forward.
Between 1840 and 1850 the notion did come up, and was discussed.
A small attempt was made in America, with what may be called a
baby-cable, across a slight extent of water, near land. The Professor
who made this experiment[13] ventured on a prediction that, in days
to come, an electric cable might unite Great Britain and America. His
friends probably pitied him as a visionary.
[13] Professor S. F. B. MORSE.
Through that decade there was no further advance. But in 1850
another step was taken. The first “open-sea” submarine cable was
laid down between Dover and Calais; one of copper wire, covered with
gutta-percha, outside which was a thick leaden tube.
For the moment a slender line joined England to the Continent.
Then an enterprising French fisherman, in quest of conger-eels,
caught the cable in his powerful hook, and hauled it up. He took it
for a stout sea-weed stem, and tried the effect of a nibble. It was
not appetising, and he flung it back into the water. Somewhat later,
however, he hooked it up again; and this time he secured his spoil,
cutting off a length, which he carried to his native town, as a rare
ocean-curiosity.
Naturally, no further telegraphic messages could be exchanged between
the two countries.
Nothing daunted, the projectors started afresh; made another cable;
and put that down. This time they met with good success; and since
1851 England and France have talked in confidential whispers below the
Channel.
Many more cables under the sea were laid in different places with
success. But all these were short ones.
A great scheme, dimly foretold in 1842 by one far-sighted American,
was stirring. Why should not the New World be united to the Old, even
as Great Britain was united to the Continent? Why not bind Europe and
America together by cables beneath the Ocean?
Not twenty or forty or sixty miles would this require, but two thousand
miles of cable. And in any part of those two thousand miles, one slight
break, one little flaw, would undo the whole. The plan meant thousands
of pounds risked, with perhaps no return.
Yet it was persevered in. Before the close of 1857, that year of Indian
Mutiny horrors, the first attempt was made. Four hundred miles of cable
slid safely down, and lay upon the ocean-bed. Then as it ran out from
the ship, it snapped. That was a failure.
Next year another attempt was made. Two ships, each bearing half of the
great coil, came together in the middle of the Atlantic, and “spliced”
the ends. After which they parted, one going east, one going west, each
laying its own share. But again the cable broke.
Enough remained on hand to supply the place of the lost length. A
third effort followed quickly. For a while success seemed to crown
perseverance. The whole cable was safely down; and messages were
exchanged. Whispers from the Old World to the New went under two
thousand miles of ocean, and answers came back. Then the wire ceased to
speak. In some manner, connection was severed.
Time passed, and for a space no more was done. But in 1864 the _Great
Eastern_ started, carrying the whole of a new and much stronger
cable--more than two thousand two hundred miles long; and of so solid a
make that each mile of it weighed three thousand pounds.
Once again disappointment lay ahead. More than half the task had
been accomplished, when the cable broke anew, the lower end as usual
vanishing.
Many days the great ship hovered round, hunting for that lost line; but
she had to give up the quest, and to go home. A year later, however,
the search was resumed; and the cable, lying quietly upon the ocean-bed
more than two miles below, was found and pulled up by powerful grapnels.
Not yet was man beaten in his contest with the Ocean. It takes a good
deal of beating to make the Anglo-Saxon give in. Wind and wave, depth
and distance, all were against him; but he went on. The plan had to be
carried out. He meant to see this thing through. He had made up his
mind to have his verbal under-sea intercourse, between Continent and
Continent.
And at last he had his way. A new cable was manufactured; and this
time, not only was it laid safely, but it held good.
Side by side with the new was laid also the old lost cable, which had
been fished up from the deep. So a double line of connection existed
between Great Britain and her Daughter-land across the Atlantic.
That aim fulfilled, after so much of failure and discouragement, other
cables were put down in many other parts of the world. Beneath the sea
in all directions they lie, joining countries widely separated.
A year or two ago it was reckoned that the full extent of all submarine
cables in the world had already reached a grand total of about two
hundred thousand miles. Not much more will bring it to a length which
might span the distance between Earth and Moon.
Lately a splendid new scheme has come up, and has been adopted. This
is--to unite the entire British Empire by one vast “All-British”
telegraphic system. As is the nervous system to a man, so will be the
said telegraphic system to the Empire.
At present many telegrams have to be sent to outlying parts through
foreign dominions--which is much as though a man’s brain should have
to send messages to his fingers through another man’s arm. But when
once this scheme has become a reality, the Mother-land will be able to
convey, under the broadest ocean-reaches, to any of her Children in
distant parts, her requests, her warnings, her sympathy, her secrets,
her congratulations, without fear of being heard by outsiders; without
risk of having her utterances stopped by perhaps “unfriendly” hands, at
some critical moment.
In this vast plan the chief cable will cover a distance of nearly nine
thousand miles; and that will include a single stretch from Vancouver
to Fanning Island, more than half as long again as the wire between
Ireland and the United States, or about three thousand five hundred
miles.
No surprise need be felt at the frequent breaking of cables, strong
though they may be.
The great depth of water into which they have to be lowered, their
own weight, the increased difficulties attendant upon stormy weather,
and--when once they are down--the uneven character of the ocean-bed,
have all to be reckoned with.
Careful previous soundings are of course made, with a view to avoiding,
if possible, abrupt descents and precipitous breaks in the line where
the cable is to be. One can easily understand how, if a cable lies taut
across from one ridge to another, it may snap with its own weight.
But even upon a fairly smooth bed, other dangers exist. Sometimes, deep
down, a big “landslip” takes place, and a vast mass of débris slides
to a lower level. If such a mass happens to descend upon a cable, the
breakage of the latter is no unlikely event.
A hundred years ago, and less, Englishmen living and toiling in India
reckoned themselves happy if, when they wrote “home,” a reply came by
return of post in ten or twelve months.
_Now_ answers to questions can be obtained in a few weeks, by post;
and in cases of emergency, news of life or death, of safe arrival or
recovery from illness, within a few hours.
Before the close of the Eighteenth Century, a British Embassy was
sent to China, to interview the then Emperor of that always difficult
country. The Ambassador and his suite were received with elaborate
politeness, at the end of their tedious voyage. China was verbally
polite then, as now. But an intimation followed, warning the visitors
that, if they wished to escape unpleasant consequences, they had better
take themselves off so soon as might be. Which they had to do, since no
Army was at hand to back them up against a good many millions of yellow
barbarians.
The story of all this reached England, and was given in the _Times_,
exactly one year after it happened.
_Now_ the contrast! We know at breakfast one morning what has gone on,
the previous afternoon, in China, in India, in Australia, in America,
in Africa.
During the days of the Peninsular War, battles were fought, reverses
took place, victories were won--and the news filtered slowly home by
hand. Larger items of information arrived generally in the course of a
few weeks; particulars as to individuals often not for months.
_Now_, not only does a check or a success on one day become known to
the Empire at large on the day following; but even while a hard-fought
battle is being carried on, we at home sometimes hear of it, and strain
our mental vision, and watch in suspense for the ending.
What would our forefathers have thought of that historic day, when the
beleaguered garrison of Ladysmith was fiercely assaulted, and we--seven
thousand miles distant--knew what was being done; hearing that the
heroic defenders were “hard-pressed,” and no more? Hours of agonised
impatience were lived through; not only in England, but in many a
far-off Colony beyond the Ocean, all waiting for the result. Not that
the news might not have been sooner sent from South Africa. Delay was
due to the cutting short of local sunshine, so that a heliographic
message could not be flashed across a few miles of veldt.
This great advance has come about, not by improvements in the world’s
shipping, though such improvements have not been small, but by means of
the Electric Cable.
Not over the Ocean, but _under_ the Ocean, messages are despatched with
lightning speed, from man to man, in all parts of the civilised Earth.
Nor is this all. Quite lately another and still more marvellous means
of communication has been discovered; a means which, if successfully
followed out, as seems now probable, will tend still further to
revolutionise the life of ships at sea.
By means of Wireless Telegraphy man can exchange thoughts with man,
when the two are separated by many miles of distance. Watchers on a
lonely lightship, far from land, can appeal in trouble to their friends
on shore. The Admiral of a great war fleet can send his voiceless
commands through space, unhampered by wire or cable, unhindered by fog
or storm.
Not under the water, but _through_ or _above_ the water these
messages journey; and in the course of time, this last new method of
signalling may even largely supersede the use of submarine cables.
Smaller and smaller grows our world, as greater and greater become
the possibilities of intercourse between places and countries, the
inhabitants of which, not very long ago, were cut off from one another
by months of arduous travel. Distance is a matter of time, not of
miles. England is nearer now to her Indian Dominions than she was two
hundred years ago to Italy.
The enormous importance of the command of the sea to the inhabitants of
Great Britain is, perhaps, more fully realised at the present time by
Britons generally than ever before.
Other Nationalities are compact, homogeneous, self-contained,
self-supporting. They have sometimes their Colonies over the water,
more or less mere excrescences, additions hooked on for a purpose,
separation from which would entail no vital loss to the ruling country.
The word “Mother-country” would be a misnomer in such cases.
But with Great Britain her over-sea Colonies are an essential part of
the “body-politic”--no more to be lopped off without injury and peril
to the whole Empire, than a man’s limbs can be lopped off without
suffering, and loss of blood, and danger to his life.
This great Empire of modern days is reckoned to contain “between eleven
and twelve millions of square miles” of land; and “in round numbers
four hundred millions” of subjects.
The four hundred millions are not, like the hundreds of millions
of Chinese, all together in one part, all surrounded by a single
containing border.
They are everywhere; in every clime; on every ocean; under tropical
skies; around temperate seas; amid frozen plains. Each fraction of the
Empire is divided from other fractions by the Ocean; and this makes
needful, as an absolute essential to the integrity of the Empire, the
command of leading Ocean-highways, by which the different portions are
united.
From England to India; from England to Canada; from England
to Australia; from England to South Africa; from England to
Gibraltar and Malta and Egypt; from England to lesser Dependencies
innumerable--always the “roadway” is over-sea; always the route is
across the ocean-waters. Those ocean highways are thronged by the
Empire’s ships; and under those seas thousands of miles of stout cable
in all directions serve as do the “speaking tubes” in some large
business establishment.
As surely as the existence of Great Britain depended in earlier days
upon the strength of her Navy, so surely does the existence of the
British Empire depend in these later days upon her command of the sea.
Once let that vanish, and the Empire must fall to pieces.
A little Island in northern waters, clothed often in fogs, small in
extent, crowded in population, without the means “aboard” of feeding
its own people;--yet, from that same little Island are extended wide
sheltering Wings around the whole globe, guarding her Dependencies,
warning off interference on the part of other Powers. So that, in the
infancy of many a young Daughter-land, and even in later more vigorous
growth, the Children have been protected; and no man, no potentate,
whatever his ambitions might be, has dared to lay a finger on them.
But the benefit is not all or only on one side.
As years go by, children repay their parents’ care. These young
sheltered lands across the Ocean are growing strong. And in the day
when the Mother-land found herself in difficulties, they joyously
sprang one and all to her help, giving freely of their time, their
money, their strength, their bravest and best, their very life-blood,
in her service.
God-given, surely, is this mighty Empire into the hands of the
Anglo-Saxon Race, to be used for God and for the good of Man, to be
governed in the Name and in the Spirit of Christ.
It is a marvellous and unique sight. A world-wide Empire of modern
days; divided by broad extents of Ocean; held together, not by fear,
not by the sword, not by the iron heel of despotism, not even primarily
by self-interest, but by Bonds of Love.
A congeries of free Nations, Mother and Children, united into ONE, by
the noblest and purest of all ties; having had through over sixty years
for its centre, for the controlling idea and motive of Empire, a Woman
of tender heart and Royal spirit, a Queenly figure on Her Throne, to
whom those hundreds of millions in many Lands were dear, since one and
all they were to Her--“My People.” And though She has passed away, that
thought has been taken up by Her Royal successor, one of whose first
Kingly utterances was in the form of letters addressed--not only to “My
People,” but to “My People beyond the Seas.”
Thus around the whole world, in every zone, through both hemispheres,
about every ocean, the Union Jack never ceases to flutter in the
breeze.
A Frenchman lately, speaking in public, described half humorously
how, as he journeyed round our globe, at each halting-place, at each
coaling-station, he found invariably “that bit of Rag,” so dear to the
Briton.
And no wonder! for it is the RAG which stands for Freedom.
In the lower Creation, under ocean-waters, we have seen how the fierce
perpetual struggle for existence goes on; how, with scarcely more than
one exception, that of the mother for her little one, each creature
lives and thinks and fights for itself alone. But man is capable of
better things. A man may forget self for his Country’s sake. He may
lose sight of ease and gain, in thought for the poorer, the weaker, the
darker tribes of Earth--under that protecting Flag.
Wherever it goes, north or south, east or west, there go also Freedom,
Justice, and a liberal recognition of the rights of Man, even of the
feeblest, even of the blackest-skinned. For the first time in the
World’s History this grand and high ideal rules in the counsels of an
Empire wide as the Ocean itself.
[Illustration]
Transcriber's Notes
The following changes have been made to the text as printed.
1. Illustrations and footnotes have been located in appropriate
paragraph breaks.
2. Obvious typographical errors have been corrected.
3. Where a word is used repeatedly in the same way, hyphenation has
been made consistent, preferring the form most often used in the
printed work, or failing that the more usual form in general use at
the time of publication. No typographical change has been made within
direct quotes from other works.
4. Page 8: "Vasco de Gama" has been changed to "Vasco da Gama".
*** End of this LibraryBlog Digital Book "The mighty deep : and what we know of it" ***
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