All we can say is that if it happens that objects of nature present themselves, whose possibility is incapable of being conceived by us on the principle of mechanism which always has a claim upon a natural being unless we rely on teleological principles, it is then to be presumed that we may confidently study natural laws on lines following both principles according as the possibility of the natural product is cognizable to our understanding from one or other principle without being disturbed by the apparent conﬂict that arises between the principles upon which our judging of the product is formed.