Part 13 (1/2)
”You have all heard,” says Sir William Hamilton, ”of the process of tunnelling through a sandbank. In this operation it is impossible to succeed unless every foot, nay, almost every inch of our progress be secured by an arch of masonry before we attempted the excavation of another. Now language is to the mind precisely what the arch is to the tunnel. The power of thinking and the power of excavation are not dependent on the words in the one case or on the mason-work in the other; but without these subsidiaries neither could be carried on beyond its rudimentary commencement. Though, therefore, we allow that every movement forward in language must be determined by an antecedent movement forward in thought, still, unless thought be accompanied at each point of its evolutions by a corresponding evolution of language, its further development is arrested.”
Man has evolved an articulate language, whereas the lower animals seem to be without one. Man, therefore, has far outstripped them in reasoning faculty as well as in power of expression. This, however, does not bar the communications which the lower animals make to one another from possessing all the essential characteristics of language, and, as a matter of fact, wherever we can follow them we find such communications effectuated by the aid of arbitrary symbols covenanted upon by the living beings that wish to communicate, and persistently a.s.sociated with certain corresponding feelings, states of mind, or material objects. Human language is nothing more than this in principle, however much further the principle has been carried in our own case than in that of the lower animals.
This being admitted, we should infer that the thought or reason on which the language of men and animals is alike founded differs as between men and brutes in degree but not in kind. More than this cannot be claimed on behalf of the lower animals, even by their most enthusiastic admirer.
The Deadlock in Darwinism: Part I {245}
It will be readily admitted that of all living writers Mr. Alfred Russel Wallace is the one the peculiar turn of whose mind best fits him to write on the subject of natural selection, or the acc.u.mulation of fortunate but accidental variations through descent and the struggle for existence. His mind in all its more essential characteristics closely resembles that of the late Mr. Charles Darwin himself, and it is no doubt due to this fact that he and Mr.
Darwin elaborated their famous theory at the same time, and independently of one another. I shall have occasion in the course of the following article to show how misled and misleading both these distinguished men have been, in spite of their unquestionable familiarity with the whole range of animal and vegetable phenomena.
I believe it will be more respectful to both of them to do this in the most outspoken way. I believe their work to have been as mischievous as it has been valuable, and as valuable as it has been mischievous; and higher, whether praise or blame, I know not how to give. Nevertheless I would in the outset, and with the utmost sincerity, admit concerning Messrs. Wallace and Darwin that neither can be held as the more profound and conscientious thinker; neither can be put forward as the more ready to acknowledge obligation to the great writers on evolution who had preceded him, or to place his own developments in closer and more conspicuous historical connection with earlier thought upon the subject; neither is the more ready to welcome criticism and to state his opponent's case in the most pointed and telling way in which it can be put; neither is the more quick to encourage new truth; neither is the more genial, generous adversary, or has the profounder horror of anything even approaching literary or scientific want of candour; both display the same inimitable power of putting their opinions forward in the way that shall best ensure their acceptance; both are equally unrivalled in the tact that tells them when silence will be golden, and when on the other hand a whole volume of facts may be advantageously brought forward. Less than the foregoing tribute both to Messrs. Darwin and Wallace I will not, and more I cannot pay.
Let us now turn to the most authoritative exponent of latter-day evolution--I mean to Mr. Wallace, whose work, ent.i.tled Darwinism, though it should have been ent.i.tled Wallaceism, is still so far Darwinistic that it develops the teaching of Mr. Darwin in the direction given to it by Mr. Darwin himself--so far, indeed, as this can be ascertained at all--and not in that of Lamarck. Mr. Wallace tells us, on the first page of his preface, that he has no intention of dealing even in outline with the vast subject of evolution in general, and has only tried to give such an account of the theory of natural selection as may facilitate a clear conception of Darwin's work. How far he has succeeded is a point on which opinion will probably be divided. Those who find Mr. Darwin's works clear will also find no difficulty in understanding Mr. Wallace; those, on the other hand, who find Mr. Darwin puzzling are little likely to be less puzzled by Mr. Wallace. He continues:--
”The objections now made to Darwin's theory apply solely to the particular means by which the change of species has been brought about, not to the fact of that change.”
But ”Darwin's theory”--as Mr. Wallace has elsewhere proved that he understands--has no reference ”to the fact of that change”--that is to say, to the fact that species have been modified in course of descent from other species. This is no more Mr. Darwin's theory than it is the reader's or my own. Darwin's theory is concerned only with ”the particular means by which the change of species has been brought about”; his contention being that this is mainly due to the natural survival of those individuals that have happened by some accident to be born most favourably adapted to their surroundings, or, in other words, through acc.u.mulation in the common course of nature of the more lucky variations that chance occasionally purveys. Mr. Wallace's words, then, in reality amount to this, that the objections now made to Darwin's theory apply solely to Darwin's theory, which is all very well as far as it goes, but might have been more easily apprehended if he had simply said, ”There are several objections now made to Mr. Darwin's theory.”
It must be remembered that the pa.s.sage quoted above occurs on the first page of a preface dated March, 1889, when the writer had completed his task, and was most fully conversant with his subject.
Nevertheless, it seems indisputable either that he is still confusing evolution with Mr. Darwin's theory, or that he does not know when his sentences have point and when they have none.
I should perhaps explain to some readers that Mr. Darwin did not modify the main theory put forward, first by Buffon, to whom it indisputably belongs, and adopted from him by Erasmus Darwin, Lamarck, and many other writers in the latter half of the eighteenth century and the earlier years of the nineteenth. The early evolutionists maintained that all existing forms of animal and vegetable life, including man, were derived in course of descent with modification from forms resembling the lowest now known.
Mr. Darwin went as far as this, and farther no one can go. The point at issue between him and his predecessors involves neither the main fact of evolution, nor yet the geometrical ratio of increase, and the struggle for existence consequent thereon. Messrs. Darwin and Wallace have each thrown invaluable light upon these last two points, but Buffon, as early as 1756, had made them the keystone of his system. ”The movement of nature,” he then wrote, ”turns on two immovable pivots: one, the illimitable fecundity which she has given to all species: the other, the innumerable difficulties which reduce the results of that fecundity.” Erasmus Darwin and Lamarck followed in the same sense. They thus admit the survival of the fittest as fully as Mr. Darwin himself, though they do not make use of this particular expression. The dispute turns not upon natural selection, which is common to all writers on evolution, but upon the nature and causes of the variations that are supposed to be selected from and thus acc.u.mulated. Are these mainly attributable to the inherited effects of use and disuse, supplemented by occasional sports and happy accidents? Or are they mainly due to sports and happy accidents, supplemented by occasional inherited effects of use and disuse?
The Lamarckian system has all along been maintained by Mr. Herbert Spencer, who, in his Principles of Biology, published in 1865, showed how impossible it was that accidental variations should acc.u.mulate at all. I am not sure how far Mr. Spencer would consent to being called a Lamarckian pure and simple, nor yet how far it is strictly accurate to call him one; nevertheless, I can see no important difference in the main positions taken by him and by Lamarck.
The question at issue between the Lamarckians, supported by Mr.
Spencer and a growing band of those who have risen in rebellion against the Charles-Darwinian system on the one hand, and Messrs.
Darwin and Wallace with the greater number of our more prominent biologists on the other, involves the very existence of evolution as a workable theory. For it is plain that what Nature can be supposed able to do by way of choice must depend on the supply of the variations from which she is supposed to choose. She cannot take what is not offered to her; and so again she cannot be supposed able to acc.u.mulate unless what is gained in one direction in one generation, or series of generations, is little likely to be lost in those that presently succeed. Now variations ascribed mainly to use and disuse can be supposed capable of being acc.u.mulated, for use and disuse are fairly constant for long periods among the individuals of the same species, and often over large areas; moreover, conditions of existence involving changes of habit, and thus of organization, come for the most part gradually; so that time is given during which the organism can endeavour to adapt itself in the requisite respects, instead of being shocked out of existence by too sudden change. Variations, on the other hand, that are ascribed to mere chance cannot be supposed as likely to be acc.u.mulated, for chance is notoriously inconstant, and would not purvey the variations in sufficiently unbroken succession, or in a sufficient number of individuals, modified similarly in all the necessary correlations at the same time and place to admit of their being acc.u.mulated. It is vital therefore to the theory of evolution, as was early pointed out by the late Professor Fleeming Jenkin and by Mr. Herbert Spencer, that variations should be supposed to have a definite and persistent principle underlying them, which shall tend to engender similar and simultaneous modification, however small, in the vast majority of individuals composing any species. The existence of such a principle and its permanence is the only thing that can be supposed capable of acting as rudder and compa.s.s to the acc.u.mulation of variations, and of making it hold steadily on one course for each species, till eventually many havens, far remote from one another, are safely reached.
It is obvious that the having fatally impaired the theory of his predecessors could not warrant Mr. Darwin in claiming, as he most fatuously did, the theory of evolution. That he is still generally believed to have been the originator of this theory is due to the fact that he claimed it, and that a powerful literary backing at once came forward to support him. It seems at first sight improbable that those who too zealously urged his claims were unaware that so much had been written on the subject, but when we find even Mr. Wallace himself as profoundly ignorant on this subject as he still either is, or affects to be, there is no limit a.s.signable to the ignorance or affected ignorance of the kind of biologists who would write reviews in leading journals thirty years ago. Mr. Wallace writes:--
”A few great naturalists, struck by the very slight difference between many of these species, and the numerous links that exist between the most different forms of animals and plants, and also observing that a great many species do vary considerably in their forms, colours and habits, conceived the idea that they might be all produced one from the other. The most eminent of these writers was a great French naturalist, Lamarck, who published an elaborate work, the Philosophie Zoologique, in which he endeavoured to prove that all animals whatever are descended from other species of animals.
He attributed the change of species chiefly to the effect of changes in the conditions of life--such as climate, food, etc.; and especially to the desires and efforts of the animals themselves to improve their condition, leading to a modification of form or size in certain parts, owing to the well-known physiological law that all organs are strengthened by constant use, while they are weakened or even completely lost by disuse. . . .
”The only other important work dealing with the question was the celebrated Vestiges of Creation, published anonymously, but now acknowledged to have been written by the late Robert Chambers.”
None are so blind as those who will not see, and it would be waste of time to argue with the invincible ignorance of one who thinks Lamarck and Buffon conceived that all species were produced from one another, more especially as I have already dealt at some length with the early evolutionists in my work Evolution, Old and New, first published ten years ago, and not, so far as I am aware, detected in serious error or omission. If, however, Mr. Wallace still thinks it safe to presume so far on the ignorance of his readers as to say that the only two important works on evolution before Mr. Darwin's were Lamarck's Philosophie Zoologique and the Vestiges of Creation, how fathomable is the ignorance of the average reviewer likely to have been thirty years ago, when the Origin of Species was first published? Mr. Darwin claimed evolution as his own theory. Of course, he would not claim it if he had no right to it. Then by all means give him the credit of it. This was the most natural view to take, and it was generally taken. It was not, moreover, surprising that people failed to appreciate all the niceties of Mr. Darwin's ”distinctive feature” which, whether distinctive or no, was a.s.suredly not distinct, and was never frankly contrasted with the older view, as it would have been by one who wished it to be understood and judged upon its merits. It was in consequence of this omission that people failed to note how fast and loose Mr.
Darwin played with his distinctive feature, and how readily he dropped it on occasion.
It may be said that the question of what was thought by the predecessors of Mr. Darwin is, after all, personal, and of no interest to the general public, comparable to that of the main issue--whether we are to accept evolution or not. Granted that Buff on, Erasmus Darwin, and Lamarck bore the burden and heat of the day before Mr. Charles Darwin was born, they did not bring people round to their opinion, whereas Mr. Darwin and Mr. Wallace did, and the public cannot be expected to look beyond this broad and indisputable fact.
The answer to this is, that the theory which Messrs. Darwin and Wallace have persuaded the public to accept is demonstrably false, and that the opponents of evolution are certain in the end to triumph over it. Paley, in his Natural Theology, long since brought forward far too much evidence of design in animal organization to allow of our setting down its marvels to the acc.u.mulation of fortunate accident, undirected by will, effort and intelligence.
Those who examine the main facts of animal and vegetable organization without bias will, no doubt, ere long conclude that all animals and vegetables are derived ultimately from unicellular organisms, but they will not less readily perceive that the evolution of species without the concomitance and direction of mind and effort is as inconceivable as is the independent creation of every individual species. The two facts, evolution and design, are equally patent to plain people. There is no escaping from either.
According to Messrs. Darwin and Wallace, we may have evolution, but are on no account to have it as mainly due to intelligent effort, guided by ever higher and higher range of sensations, perceptions, and ideas. We are to set it down to the shuffling of cards, or the throwing of dice without the play, and this will never stand.
According to the older men, cards did indeed count for much, but play counted for more. They denied the teleology of the time--that is to say, the teleology that saw all adaptation to surroundings as part of a plan devised long ages since by a quasi-anthropomorphic being who schemed everything out much as a man would do, but on an infinitely vaster scale. This conception they found repugnant alike to intelligence and conscience, but, though they do not seem to have perceived it, they left the door open for a design more true and more demonstrable than that which they excluded. By making their variations mainly due to effort and intelligence, they made organic development run on all-fours with human progress, and with inventions which we have watched growing up from small beginnings.
They made the development of man from the amoeba part and parcel of the story that may be read, though on an infinitely smaller scale, in the development of our most powerful marine engines from the common kettle, or of our finest microscopes from the dew-drop.