For the chance against meeting with such a concept, which is only possible through Reason, would seem so infinitely great, that it would be just as if there were no natural law, no cause in the mere mechanical working of nature capable of producing it; but as if only the concept of such an Object, as a concept which Reason alone can supply and with which it can compare the thing, could contain the causality for such an effect. This then would be regarded as a purpose, but as a product of art, not as a natural purpose (vestigium hominis video).

But in order to regard a thing cognised as a natural product as a purpose also — consequently as a natural purpose, if this is not a contradiction — something more is required.