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    The Extinction of Man

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    Chapter 24
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    It is part of the excessive egotism of the human animal that the bare
    idea of its extinction seems incredible to it. "A world without _us_!"
    it says, as a heady young Cephalaspis might have said it in the old
    Silurian sea. But since the Cephalaspis and the Coccostëus many a fine
    animal has increased and multiplied upon the earth, lorded it over land
    or sea without a rival, and passed at last into the night. Surely it is
    not so unreasonable to ask why man should be an exception to the rule.
    From the scientific standpoint at least any reason for such exception is
    hard to find.

    No doubt man is undisputed master at the present time--at least of most
    of the land surface; but so it has been before with other animals. Let
    us consider what light geology has to throw upon this. The great land
    and sea reptiles of the Mesozoic period, for instance, seem to have been
    as secure as humanity is now in their pre-eminence. But they passed away
    and left no descendants when the new orders of the mammals emerged from
    their obscurity. So, too, the huge Titanotheria of the American
    continent, and all the powerful mammals of Pleistocene South America,
    the sabre-toothed lion, for instance, and the Machrauchenia suddenly
    came to a finish when they were still almost at the zenith of their
    rule. _And in no case does the record of the fossils show a really
    dominant species succeeded by its own descendants._ What has usually
    happened in the past appears to be the emergence of some type of animal
    hitherto rare and unimportant, and the extinction, not simply of the
    previously ruling species, but of most of the forms that are at all
    closely related to it. Sometimes, indeed, as in the case of the extinct
    giants of South America, they vanished without any considerable rivals,
    victims of pestilence, famine, or, it may be, of that cumulative
    inefficiency that comes of a too undisputed life. So that the analogy of
    geology, at anyrate, is against this too acceptable view of man's
    certain tenure of the earth for the next few million years or so.

    And, after all, even now man is by no means such a master of the
    kingdoms of life as he is apt to imagine. The sea, that mysterious
    nursery of living things, is for all practical purposes beyond his
    control. The low-water mark is his limit. Beyond that he may do a little
    with seine and dredge, murder a few million herrings a year as they come
    in to spawn, butcher his fellow air-breather, the whale, or haul now and
    then an unlucky king-crab or strange sea-urchin out of the deep water,
    in the name of science; but the life of the sea as a whole knows him
    not, plays out its slow drama of change and development unheeding him,
    and may in the end, in mere idle sport, throw up some new terrestrial
    denizens, some new competitor for space to live in and food to live
    upon, that will sweep him and all his little contrivances out of
    existence, as certainly and inevitably as he has swept away auk, bison,
    and dodo during the last two hundred years.

    For instance, there are the Crustacea. As a group the crabs and lobsters
    are confined below the high-water mark. But experiments in air-breathing
    are no doubt in progress in this group--we already have tropical
    land-crabs--and as far as we know there is no reason why in the future
    these creatures should not increase in size and terrestrial capacity. In
    the past we have the evidence of the fossil _Paradoxides_ that creatures
    of this kind may at least attain a length of six feet, and, considering
    their intense pugnacity, a crab of such dimensions would be as
    formidable a creature as one could well imagine. And their amphibious
    capacity would give them an advantage against us such as at present is
    only to be found in the case of the alligator or crocodile. If we
    imagine a shark that could raid out upon the land, or a tiger that could
    take refuge in the sea, we should have a fair suggestion of what a
    terrible monster a large predatory crab might prove. And so far as
    zoological science goes we must, at least, admit that such a creature is
    an evolutionary possibility.

    Then, again, the order of the Cephalopods, to which belong the
    cuttle-fish and the octopus (sacred to Victor Hugo), may be, for all we
    can say to the contrary, an order with a future. Their kindred, the
    Gastropods, have, in the case of the snail and slug, learnt the trick of
    air-breathing. And not improbably there are even now genera of this
    order that have escaped the naturalist, or even well-known genera whose
    possibilities in growth and dietary are still unknown. Suppose some day
    a specimen of a new species is caught off the coast of Kent. It excites
    remark at a Royal Society soirée, engenders a Science Note or so, "A
    Huge Octopus!" and in the next year or so three or four other specimens
    come to hand, and the thing becomes familiar. "Probably a new and larger
    variety of _Octopus_ so-and-so, hitherto supposed to be tropical," says
    Professor Gargoyle, and thinks he has disposed of it. Then conceive some
    mysterious boating accidents and deaths while bathing. A large animal of
    this kind coming into a region of frequent wrecks might so easily
    acquire a preferential taste for human nutriment, just as the Colorado
    beetle acquired a new taste for the common potato and gave up its old
    food-plants some years ago. Then perhaps a school or pack or flock of
    _Octopus gigas_ would be found busy picking the sailors off a stranded
    ship, and then in the course of a few score years it might begin to
    stroll up the beaches and batten on excursionists. Soon it would be a
    common feature of the watering-places--possibly at last commoner than
    excursionists. Suppose such a creature were to appear--and it is, we
    repeat, a possibility, if perhaps a remote one--how could it be fought
    against? Something might be done by torpedoes; but, so far as our past
    knowledge goes, man has no means of seriously diminishing the numbers of
    any animal of the most rudimentary intelligence that made its fastness
    in the sea.

    Even on land it is possible to find creatures that with a little
    modification might become excessively dangerous to the human ascendency.
    Most people have read of the migratory ants of Central Africa, against
    which no man can stand. On the march they simply clear out whole
    villages, drive men and animals before them in headlong rout, and kill
    and eat every living creature they can capture. One wonders why they
    have not already spread the area of their devastations. But at present
    no doubt they have their natural checks, of ant-eating birds, or what
    not. In the near future it may be that the European immigrant, as he
    sets the balance of life swinging in his vigorous manner, may kill off
    these ant-eating animals, or otherwise unwittingly remove the checks
    that now keep these terrible little pests within limits. And once they
    begin to spread in real earnest, it is hard to see how their advance
    could be stopped. A world devoured by ants seems incredible now, simply
    because it is not within our experience; but a naturalist would have a
    dull imagination who could not see in the numerous species of ants, and
    in their already high intelligence, far more possibility of strange
    developments than we have in the solitary human animal. And no doubt the
    idea of the small and feeble organism of man, triumphant and
    omnipresent, would have seemed equally incredible to an intelligent
    mammoth or a palæolithic cave bear.

    And, finally, there is always the prospect of a new disease. As yet
    science has scarcely touched more than the fringe of the probabilities
    associated with the minute fungi that constitute our zymotic diseases.
    But the bacilli have no more settled down into their final quiescence
    than have men; like ourselves, they are adapting themselves to new
    conditions and acquiring new powers. The plagues of the Middle Ages, for
    instance, seem to have been begotten of a strange bacillus engendered
    under conditions that sanitary science, in spite of its panacea of
    drainage, still admits are imperfectly understood, and for all we know
    even now we may be quite unwittingly evolving some new and more terrible
    plague--a plague that will not take ten or twenty or thirty per cent.,
    as plagues have done in the past, but the entire hundred.

    No; man's complacent assumption of the future is too confident. We
    think, because things have been easy for mankind as a whole for a
    generation or so, we are going on to perfect comfort and security in the
    future. We think that we shall always go to work at ten and leave off at
    four, and have dinner at seven for ever and ever. But these four
    suggestions, out of a host of others, must surely do a little against
    this complacency. Even now, for all we can tell, the coming terror may
    be crouching for its spring and the fall of humanity be at hand. In the
    case of every other predominant animal the world has ever seen, I
    repeat, the hour of its complete ascendency has been the eve of its
    entire overthrow. But if some poor story-writing man ventures to figure
    this sober probability in a tale, not a reviewer in London but will tell
    him his theme is the utterly impossible. And, when the thing happens,
    one may doubt if even then one will get the recognition one deserves.
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