of nature in its universal conformity to law with an Idea which limits it to a particular form, for which it contains no ground in itself — is not comprehended by our Reason. It lies in the supersensible substrate of nature, of which we can determine nothing positively, except that it is the being in itself of which we merely know the phenomenon. But the principle, “all that we assume as belonging to this nature (phenomenon) and as its product, must be thought as connected therewith according to mechanical laws,” has none the less force, because without this kind of causality organised beings (as purposes of nature) would not be natural products.

Now if the teleological principle of the production of these beings be assumed (as is inevitable), we can place at the basis of