In a Critique of Judgement the part containing the aesthetical Judgement is essential, because this alone contains a principle which the Judgement places quite _a priori_ at the basis of its reflection upon nature; viz., the principle of a formal purposiveness of nature, according to its particular (empirical) laws, for our cognitive faculty, without which the Understanding could not find itself in nature. On the other hand no reason _a priori_ could be specified,--and even the possibility of a reason would not be apparent from the concept of nature as an object of experience whether general or particular,--why there should be objective purposes of nature, _i.e._ things which are only possible as natural purposes; but the Judgement, without containing such a principle _a priori_ in itself, in given cases (of certain products), in order to make use of the concept of purposes on behalf of Reason, would only contain the rule according to which that transcendental principle has already prepared the Understanding to apply to nature the concept of a purpose (at least as regards its form). But the transcendental principle which represents a purposiveness of nature (in subjective reference to our cognitive faculty) in the form of a thing as a principle by which we judge of nature, leaves it quite undetermined where and in what cases I have to judge of a product according to a principle of purposiveness, and not rather according to universal natural laws. It leaves it to the _aesthetical_ Judgement to decide by taste the harmony of this product (of its form) with our cognitive faculty (so far as this decision rests not on any agreement with concepts but on feeling). On the other hand, the Judgement teleologically employed furnishes conditions determinately under which something (_e.g._ an organised body) is to be judged according to the Idea of a purpose of nature; but it can adduce no fundamental proposition from the concept of nature as an object of experience authorising it to ascribe to nature _a priori_ a reference to purposes, or even indeterminately to assume this of such products in actual experience. The reason of this is that we must have many particular experiences, and consider them under the unity of their principle, in order to be able to cognise, even empirically, objective purposiveness in a certain object.--The aesthetical Judgement is therefore a special faculty for judging of things according to a rule, but not according to concepts. The teleological Judgement is not a special faculty, but only the reflective Judgement in general, so far as it proceeds, as it always does in theoretical cognition, according to concepts; but in respect of certain objects of nature according to special principles, viz., of a merely reflective Judgement, and not of a Judgement that determines Objects. Thus as regards its application it belongs to the theoretical part of Philosophy; and on account of its special