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§ 66.: Of the principle of judging of internal purposiveness in organised beings - Immanuel Kant, The Critique of Judgement [1892]

Edition used:

Kant’s Critique of Judgement, translated with Introduction and Notes by J.H. Bernard (2nd ed. revised) (London: Macmillan, 1914).

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§ 66.

Of the principle of judging of internal purposiveness in organised beings

This principle, which is at the same time a definition, is as follows: An organised product of nature is one in which every part is reciprocally purpose, [end] and means. In it nothing is vain, without purpose, or to be ascribed to a blind mechanism of nature.

This principle, as regards its occasion, is doubtless derived from experience, viz. from that methodised experience called observation; but on account of the universality and necessity which it ascribes to such purposiveness it cannot rest solely on empirical grounds, but must have at its basis an a priori principle, although it be merely regulative and these purposes lie only in the idea of the judging [subject] and not in an effective cause. We may therefore describe the aforesaid principle as a maxim for judging of the internal purposiveness of organised beings.

It is an acknowledged fact that the dissectors of plants and animals, in order to investigate their structure and to find out the reasons, why and for what end such parts, such a disposition and combination of parts, and just such an internal form have been given them, assume as indisputably necessary the maxim that nothing in such a creature is vain; just as they lay down as the fundamental proposition of the universal science of nature, that nothing happens by chance. In fact, they can as little free themselves from this teleological proposition as from the universal physical proposition; for as without the latter we should have no experience at all, so without the former we should have no guiding thread for the observation of a species of natural things which we have thought teleologically under the concept of natural purposes.

Now this concept brings the Reason into a quite different order of things from that of a mere mechanism of nature, which is no longer satisfying here. An Idea is to be the ground of the possibility of the natural product. But because this is an absolute unity of representation, instead of the material being a plurality of things that can supply by itself no definite unity of composition,—if that unity of the Idea is to serve at all as the a priori ground of determination of a natural law of the causality of such a form of composition,—the purpose of nature must be extended to everything included in its product. For if we once refer action of this sort on the whole to any supersensible ground of determination beyond the blind mechanism of nature, we must judge of it altogether according to this principle; and we have then no reason to regard the form of such a thing as partly dependent on mechanism—for by such mixing up of disparate principles no certain rule of judging would be left.

For example, it may be that in an animal body many parts can be conceived as concretions according to mere mechanical laws (as the hide, the bones, the hair). And yet the cause which brings together the required matter, modifies it, forms it, and puts it in its appropriate place, must always be judged of teleologically; so that here everything must be considered as organised, and everything again in a certain relation to the thing itself is an organ.