judgement upon its possibility, and so unite both principles. One method of explanation excludes the other; even supposing that objectively both grounds of the possibility of such a product rested on a single ground, to which we did not pay attention. The principle which should render possible the compatibility of both in judging of nature must be placed in that which lies outside both (and consequently outside the possible empirical representation of nature), but yet contains their ground, i.e. in the supersensible; and each of the two methods of explanation must be referred thereto. Now of this we can have no concept but the indeterminate concept of a ground, which makes the judging of nature by empirical laws possible, but which we cannot determine more nearly by any predicate.

Hence the union of both