For the benefit of those who find Kant's German difficult we subjoin a neat French Translation from the pen of M. Barni.
"On sait que ceux qui dissèquent les plantes et les animaux pour en étudier la structure, et pouvoir reconnaître pourquoi et à quelle fin telles parties leur ont été données, pourquoi telle disposition et tel arrangement des parties, et précisément cette forme intérieure, admettent comme indispensablement nécessaire cette maxime que rien n'existe en vain dans ces créatures, et lui accordent une valeur égale à celle de ce principe de la physique générale, que rien n'arrive par hasard. Et en effet ils ne peuvent pas plus rejeter ce principe téléologique que le principe universel de la physique; car, de même qu'en l'absence de ce dernier il n'y aurait plus d'expérience possible en général, de même, sans le premier, il n'y aurait plus de fil conducteur pour l'observation d'une espèce de choses de la nature, que nous avons une fois conçues téléologiquement sous le concept des fins de la nature.
"En effet ce concept introduit la raison dans un tout autre ordre de choses que celui du pur mécanisme de la nature, qui ne peut plus ici nous satisfaire. Il faut qu'une idée serve de principe à la possibilité de la production de la nature. Mais comme une idée est une unité absolue de réprésentation, tandis que la matière est une pluralité de choses qui par elle-même ne peut fournir aucune unité déterminée de composition, si cette unité de l'idée doit servir, comme principe a priori, à déterminer une loi naturelle à la production d'une forme de ce genre, il faut que la fin de la nature s'étende à tout ce qui est contenu dans sa production. En effet, dès que pour expliquer un certain effet, nous cherchons, au-dessus de l'aveugle mécanisme de la nature, un principe supra-sensible et que nous l'y rapportons en général, nous devons le juger tout entier d'après ce principe; et il n'y a pas de raison pour regarder la forme de cette chose comme dépendant encore en partie de l'autre principe, car alors, dans le mélange de principes hétérogènes, il ne resterait plus de règle sûre pour le jugement." Critique du Jugement, Section 65.
Kant is not in any dress the easiest of thinkers to follow—a result possibly consequent upon the resemblance which his writings bear to trains of reasoning as they pass from the lips of one who thinks aloud. The following paragraph from another work of Dr. Whewell's may be useful to some minds as a comment upon this portion of Kant's teleology.
"There is yet one other Idea which I shall mention, though it is one about which difficulties have been raised, since the consideration of such difficulties may be instructive: the Idea of a purpose, or as it is often termed, a Final Cause, in organized bodies. It has been held, and rightly, that the assumption of a Final Cause of each part of animals and plants is as inevitable as the assumption of an efficient cause of every event. The maxim, that in organized bodies nothing is in vain, is as necessarily true as the maxim that nothing happens by chance. I have elsewhere shown fully that this Idea is not deduced from any special facts, but is assumed as a law governing all facts in organic nature, directing the researches and interpreting the observations of physiologists. I have also remarked that it is not at variance with that other law, that plants and that animals are constructed upon general plans, of which plans, it may be, we do not see the necessity, though we see how wide is their generality. This Idea of a purpose,—of a Final Cause,—then, thus supplied by our minds, is found to be applicable throughout the organic world. It is in virtue of this Idea that we conceive animals and plants as subject to disease; for disease takes place when the parts do not fully answer their purpose; when they do not do what they ought to do. How is it then that we thus find an Idea which is supplied by our own minds, but which is exemplified in every part of the organic world? Here perhaps the answer will be readily allowed. It is because this Idea is an Idea of the Divine Mind. There is a Final Cause in the constitution of these parts of the universe, and therefore we can interpret them by means of the Idea of Final Cause. We can see a purpose, because there is a purpose. Is it too presumptuous to suppose that we can thus enter into the Ends and Purposes of the Divine Mind? We willingly grant and declare that it would be presumptuous to suppose that we can enter into them to any but a very small degree. They doubtless go immeasurably beyond our mode of understanding or conceiving them. But to a certain extent we can go. We can go so far as to see that they are Ends and Purposes. It is not a vain presumption in us to suppose that we know that the eye was made for seeing and the ear for hearing. In this the most pious of men see nothing impious: the most cautious philosophers see nothing rash. And that we can see thus far into the designs of the Divine Mind, arises, we hold, from this:—that we have an Idea of Design and of Purpose which, so far as it is merely that, is true; and so far, is Design and Purpose in the same sense in the one case and in the other."[81]
It will be well worth while to close this present series of illustrations by a review of Professor Huxley's last published and best considered positions on Teleology. He printed, in 1871, an article on Haeckel's "Natürliche Schöpfungs Geschichte," and has now entitled it "The Genealogy of Animals," and included it in his recent volume of Critiques. We may therefore assume that we here find the distinguished Biologist's deliberate opinions. He says, p. 305, "The Teleology which supposes that the eye, such as we see it in man or one of the higher Vertebrata,[82] was made with the precise structure which it exhibits, for the purpose of enabling the animal which possesses it to see, has undoubtedly received its death-blow. Nevertheless it is necessary to remember that there is a wider Teleology, which is not touched by the doctrine of Evolution, but is actually based upon the fundamental proposition of Evolution. That proposition is, that the whole world, living and not living, is the result of the mutual interaction, according to definite laws, of the forces possessed by the molecules of which the primitive nebulosity of the universe was composed. If this be true, it is no less certain that the existing world lay, potentially, in the cosmic vapour; and that a sufficient intelligence could, from a knowledge of the properties of the molecules of that vapour, have predicted, say the state of the Fauna of Britain in 1869, with as much certainty as one can say what will happen to the vapour of the breath on a cold winter's day.
"Consider a kitchen clock, which ticks loudly, shows the hours, minutes, and seconds, strikes, cries 'cuckoo!' and perhaps shows the phases of the moon. When the clock is wound up, all the phenomena which it exhibits are potentially contained in its mechanism, and a clever clockmaker could predict all it will do after an examination of its structure.
"If the evolution theory is correct, the molecular structure of the cosmic gas stands in the same relation to the phenomena of the world as the structure of the clock to its phenomena."
Mr. Huxley's comparisons[83] are always amusing, partly because they are of an unlooked for description. They also keep up the attention of his readers or hearers. But they have one great fault—the fault we noticed in explaining the nature of analogical argument—they carry away the mind too far, and lead the reader often, sometimes the writer himself, into very serious oversights. Let us take notice how the Professor carries out his present similitude. "Now let us suppose a death-watch, living in the clock-case, to be a learned and intelligent student of its works. He might say, 'I find here nothing but matter and force and pure mechanism from beginning to end,' and he would be quite right. But if he drew the conclusion that the clock was not contrived for a purpose, he would be quite wrong. On the other hand, imagine another death-watch of a different turn of mind. He, listening to the monotonous 'tick! tick!' so exactly like his own, might arrive at the conclusion that the clock was itself a monstrous sort of death-watch, and that its final cause and purpose was to tick. How easy to point to the clear relation of the whole mechanism to the pendulum, to the fact that the one thing the clock did always and without intermission was to tick, and that all the rest of its phenomena were intermittent and subordinate to ticking! For all this, it is certain that kitchen clocks are not contrived for the purpose of making a ticking noise.