Note 18 — Chapter III

§ 26. Thus let us take a case of his own choosing, and the one which is adduced by him as typical of "the application of the argument." "I know of no better method of introducing so large a subject than that of comparing a single thing with a single thing; an eye, for example, with a telescope. As far as the examination of the instrument goes, there is precisely the same proof that the eye was made for vision as there is that the telescope was made for assisting it. They are both made upon the same principles, both being adjusted to the laws by which the transmission and refraction of rays of light are regulated. I speak not of the origin of the laws themselves; but these laws being fixed, the construction in both cases is adapted to them. For instance: these laws require, in order to produce the same effect, that the rays of light, in passing through water into the eye, should be refracted by a more convex surface than when it passes out of air into the eye. Accordingly we find that the eye of a fish, in that part of it called the crystalline lens, is much rounder than the eye of terrestrial animals. What plainer manifestation of design can there be than this difference?" But what, let us ask, is the proximate cause of this difference? 'The immediate volition of the Deity, manifested in special creation,' virtually answers Paley; while we of to-day are able to reply, 'The agency of natural laws, to wit, inheritance, variation, survival of the fittest, and probably of other laws as yet not discovered.' Now, of course, according to the former of these two premises, there can be no more legitimate conclusion than that the difference in question is due to intelligent and special design; but, according to the other premise, it is equally clear that no conclusion can be more unwarranted; for, under the latter view, the greater rotundity of the crystalline lens in a fish's eye no more exhibits the presence of any special design than does the adaptation of a river to the bed which it has itself been the means of excavating. When, therefore, Paley goes on to ask:—"How is it possible, under circumstances of such close affinity, and under the operation of equal evidence, to exclude contrivance from the case of the eye, yet to acknowledge the proof of contrivance having been employed, as the plainest and clearest of all propositions, in the case of the telescope?" the answer is sufficiently obvious, namely, that the "evidence" in the two cases is not "equal;"—any more than is the existence, say, of the Nile of equal value in point of evidence that it was designed for traffic, as is the existence of the Suez Canal that it was so designed. And the mere fact that the problem of achromatism was solved by "the mind of a sagacious optician inquiring how this matter was managed in the eye," no more proves that "this could not be in the eye without purpose, which suggested to the optician the only effectual means of attaining that purpose," than would the fact, say, of the winnowing of corn having suggested the fanning-machine prove that air currents were designed for the purpose of eliminating chaff from grain. In short, the real substance of the argument from Design must eventually merge into that which Paley, in the above-quoted passage, expressly passes over—viz., "the origin of the laws themselves;" for so long as there is any reason to suppose that any apparent "adaptation" to a certain set of "fixed laws" is itself due to the influence of other "fixed laws," so long have we as little right to say that the latter set of fixed laws exhibit any better indications of intelligent adaptation to the former set, than the former do to that of the latter—the eye to light, than light to the eye. Hence I conceive that Mill is entirely wrong when he says of Paley's argument, "It surpasses analogy exactly as induction surpasses it," because "the instances chosen are particular instances of a circumstance which experience shows to have a real connection with an intelligent origin—the fact of conspiring to an end." Experience shows as this, but it shows us more besides; it shows us that there is no necessary or uniform connection between an "intelligent origin" and the fact of apparent "means conspiring to an [apparent] end." If the reader will take the trouble to compare this quotation just made from Mill, and the long train of reasoning that follows, with an admirable illustration in Mr. Wallace's "Natural Selection," he will be well rewarded by finding all the steps in Mr. Mill's reasoning so closely paralleled by the caricature, that but for the respective dates of publication, one might have thought the latter had an express reference to the former.[18] True, Mr. Mill closes his argument with a brief allusion to the "principle of the survival of the fittest," observing that "creative forethought is not absolutely the only link by which the origin of the wonderful mechanism of the eye may be connected with the fact of sight." I am surprised, however, that a man of Mr. Mill's penetration did not see that whatever view we may take as to "the adequacy of this principle (i.e., Natural Selection) to account for such truly admirable combinations as some of those in nature," the argument from Design is not materially affected. So far as this argument is concerned, the issue is not Design versus Natural Selection, but it is Design versus Natural Law. By all means, "leaving this remarkable speculation (i.e., Mr. Darwin's) to whatever fate the progress of discovery may have in store for it," and it by no means follows that "in the present state of knowledge the adaptations in nature afford a large balance of probability in favour of creation by intelligence." For whatever we may think of this special theory as to the mode, there can be no longer any reasonable doubt, "in the present state of our knowledge," as to the truth of the general theory of Evolution; and the latter, if accepted, is as destructive to the argument from Design as would the former be if proved. In a word, it is the fact and not the method of Evolution which is subversive of Teleology in its Paleyerian form.