Kant's Critique of Judgement · Immanuel Kant
ANALYTIC OF THE TELEOLOGICAL JUDGEMENT
The concept of a thing as in itself a natural purpose is therefore no constitutive concept of Understanding or of Reason, but it can serve as a regulative concept for the reflective Judgement, to guide our investigation about objects of this kind by a distant analogy with our own causality according to purposes generally, and in our meditations upon their ultimate ground. This latter use, however, is not in reference to the knowledge of nature or of its original ground, but rather to our own practical faculty of Reason, in analogy with which we considered the cause of that purposiveness. Organised beings are then the only beings in nature which, considered in themselves and apart from any relation to other things, can be thought as possible only as purposes of nature. Hence they first afford objective reality to the concept of a _purpose of nature_, as distinguished from a practical purpose; and so they give to the science of nature the basis for a teleology, _i.e._ a mode of judgement about natural Objects according to a special principle which otherwise we should in no way be justified in introducing (because we cannot see _a priori_ the possibility of this kind of causality). § 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.
To judge of a thing as a natural purpose on account of its internal form is something very different from taking the existence of that thing to be a purpose of nature. For the latter assertion we require not merely the concept of a possible purpose, but the knowledge of the final purpose (_scopus_) of nature. But this requires a reference of such knowledge to something supersensible far transcending all our teleological knowledge of nature, for the purpose of [the existence of][109] nature must itself be sought beyond nature. The internal form of a mere blade of grass is sufficient to show that for our human faculty of judgement its origin is possible only according to the rule of purposes. But if we change our point of view and look to the use which other natural beings make of it, abandon the consideration of its internal organisation and only look to its externally purposive references, we shall arrive at no categorical purpose; all this purposive reference rests on an ever more distant condition, which, as unconditioned (the presence of a thing as final purpose), lies quite outside the physico-teleological view of the world. For example, grass is needful for the ox, which again is needful for man as a means of existence, but then we do not see why it is necessary that men should exist (a question this, which we shall not find so easy to answer if we sometimes cast our thoughts on the New Hollanders or the inhabitants of Tierra del Fuego). So conceived, the thing is not even a natural purpose, for neither it (nor its whole genus) is to be regarded as a natural product.
Hence it is only so far as matter is organised that it necessarily carries with it the concept of a natural purpose, because this its specific form is at the same time a product of nature. But this concept leads necessarily to the Idea of collective nature as a system in accordance with the rule of purposes, to which Idea all the mechanism of nature must be subordinated according to principles of Reason (at least in order to investigate natural phenomena therein). The principle of Reason belongs to it only as a subjective principle or a maxim: viz. everything in the World is some way good for something; nothing is vain in it. By the example that nature gives us in its organic products we are justified, nay called upon, to expect of it and of its laws nothing that is not purposive on the whole.
It is plain that this is not a principle for the determinant but only for the reflective Judgement; that it is regulative and not constitutive; and that we derive from it a clue by which we consider natural things in reference to an already given ground of determination according to a new law-abiding order; and extend our natural science according to a different principle, viz. that of final causes, but yet without prejudice to the principle of mechanical causality. Furthermore, it is in no wise thus decided, whether anything of which we judge by this principle, is a _designed_ purpose of nature; whether the grass is for the ox or the sheep, or whether these and the other things of nature are here for men. It is well also from this side to consider the things which are unpleasant to us and are contrary to purpose in particular references. Thus, for example, we can say: The vermin that torment men in their clothes, their hair, or their beds, may be, according to a wise appointment of nature, a motive to cleanliness which is in itself an important means for the preservation of health.
Or again the mosquitoes and other stinging insects that make the wildernesses of America so oppressive to the savages, may be so many goads to activity for these primitive men, [inducing them] to drain the marshes and bring light into the forests which intercept every breath of air, and in this way, as well as by cultivating the soil, to make their habitations more healthy. The same thing, which appears to men contradictory to nature in its inner organisation, if viewed in this light gives an entertaining, sometimes an instructive, outlook into a teleological order of things, to which, without such a principle, mere physical observation would not lead us by itself. Thus some persons regard the tapeworm as given to the men or animals in whom it resides, as a kind of set-off for some defect in their vital organs; now I would ask if dreams (without which we never sleep, though we seldom remember them) may not be a purposive ordinance of nature? For during the relaxation of all the moving powers of the body, they serve to excite internally the vital organs by the medium of the Imagination and its great activity (which in this state generally rises to the height of affection). During sleep the Imagination commonly is more actively at play when the stomach is overloaded, in which case this excitement is the more necessary. Consequently, then, without this internal power of motion and this fatiguing unrest, on account of which we complain about our dreams (though in fact they are rather remedial), sleep even in a sound state of health would be a complete extinction of life.
Also the beauty of nature, _i.e._ its connexion with the free play of our cognitive faculties in apprehending and judging of its appearance, can be regarded as a kind of objective purposiveness of nature in its whole [content] as a system of which man is a member; if once the teleological judging of the same by means of the natural purposes which organised beings suggest to us, has justified for us the Idea of a great system of purposes of nature. We can regard it as a favour[110] which nature has felt for us, that in addition to what is useful it has so profusely dispensed beauty and charm; and we can therefore love it, as well as regard it with respect on account of its immensity, and feel ourselves ennobled by such regard; just as if nature had established and adorned its splendid theatre precisely with this view. We shall say only one thing more in this paragraph. If we have once discovered in nature a faculty of bringing forth products that can only be thought by us in accordance with the concept of final causes, we go further still. We venture to judge that things belong to a system of purposes, which yet do not (either in themselves or in their purposive relations) necessitate our seeking for any principle of their possibility beyond the mechanism of causes working blindly. For the first Idea, as concerns its ground, already brings us beyond the world of sense; since the unity of the supersensible principle must be regarded as valid in this way not merely for certain species of natural beings, but for the whole of nature as a system.
The expression, a purpose of nature, already sufficiently prevents the confusion of mixing up natural science and the occasion that it gives for judging _teleologically_ of its objects, with the consideration of God, and so of a _theological_ derivation of them. We must not regard it as insignificant, if one interchanges this expression with that of a divine purpose in the ordering of nature, or gives out the latter as more suitable and proper for a pious soul, because it must come in the end to deriving these purposive forms in nature from a wise author of the world. On the contrary, we must carefully and modestly limit ourselves to the expression, a purpose of nature, which asserts exactly as much as we know. Before we ask after the cause of nature itself, we find in nature, and in the course of its development, products of the same kind which are developed in it according to known empirical laws, in accordance with which natural science must judge of its objects, and, consequently, must seek in nature their causality according to the rule of purposes. So then it must not transgress its bounds in order to introduce into itself as a domestic principle that, to whose concept no experience can be commensurate, upon which we are only entitled to venture after the completion of natural science.
Natural characteristics which demonstrate themselves _a priori_, and consequently admit of insight into their possibility from universal principles without any admixture of experience, although they carry with them a technical purposiveness, yet cannot, because they are absolutely necessary, be referred to the Teleology of nature, as to a method belonging to Physic for solving its problems. Arithmetical or geometrical analogies, as well as universal mechanical laws,--however strange and admirable may seem to us the union of different rules, quite independent of one another according to all appearance, in a single principle,--possess on that account no claim to be teleological grounds of explanation in Physic. Even if they deserve to be brought into consideration in the universal theory of the purposiveness of things of nature, yet they belong to another [science], _i.e._ Metaphysic, and constitute no internal principle of natural science; as with the empirical laws of natural purposes in organised beings, it is not only permissible but unavoidable to use the teleological _mode of judging_ as a principle of the doctrine of nature in regard to a particular class of its objects.
So to the end that Physic may keep within its own bounds, it abstracts itself entirely from the question, whether natural purposes are _designed_ or _undesigned_; for that would be to meddle in an extraneous business, in Metaphysic. It is enough that there are objects, alone _explicable_ according to natural laws which we can only think by means of the Idea of purposes as principle, and also alone internally _cognisable_ as concerns their internal form, in this way. In order, therefore, to remove the suspicion of the slightest assumption,--as if we wished to mix with our grounds of cognition something not belonging to Physic at all, viz. a supernatural cause,--we speak in Teleology, indeed, of nature as if the purposiveness therein were designed, but in such a way that this design is ascribed to nature, _i.e._ to matter. Now in this way there can be no misunderstanding, because no design in the proper meaning of the word can possibly be ascribed to inanimate matter; we thus give notice that this word here only expresses a principle of the reflective not of the determinant Judgement, and so is to introduce no particular ground of causality; but only adds for the use of the Reason a different kind of investigation from that according to mechanical laws, in order to supplement the inadequacy of the latter even for empirical research into all particular laws of nature. Hence we speak quite correctly in Teleology, so far as it is referred to Physic, of the wisdom, the economy, the forethought, the beneficence of Nature, without either making an intelligent being of it, for that would be preposterous; or even without presuming to place another intelligent Being above it as its Architect, for that would be presumptuous.[111] But there should be only signified thereby a kind of causality of nature after the analogy of our own in the technical use of Reason, in order to have before us the rule according to which certain products of nature must be investigated.
But now why is it that Teleology usually forms no proper part of theoretical natural science, but is regarded as a propaedeutic or transition to Theology? This is done in order to restrict the study of nature, mechanically considered, to that which we can so subject to observation or experiment that we are able to produce it ourselves as nature does, or at least by similar laws. For we see into a thing completely only so far as we can make it in accordance with our concepts and bring it to completion. But organisation, as an inner purpose of nature, infinitely surpasses all our faculty of presenting the like by means of art. And as concerns the external contrivances of nature regarded as purposive (wind, rain, etc.), Physic, indeed, considers their mechanism, but it cannot at all present their reference to purposes, so far as this is a condition necessarily belonging to cause; for this necessity of connexion has to do altogether with the combination of our concepts and not with the constitution of things.
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