together do they complete the explanation of things as they really are, and of existence in general. So that whoever should exactly trace one of these three to its ultimate origin, would be found to have necessarily brought the others into his solution of the problem; just as an absolutely clear and exhaustive understanding of any single thing in the world would imply a perfect comprehension of everything else.

Now if we were to start from a given system of metaphysics, which is assumed to be true, we should reach synthetically a basis of morals, and this basis, being, so to say, built up from below, would provide the resulting ethical structure with a sure foundation. But in the present case, since the terms of the question enforce the separation of ethics from all metaphysics, there remains nothing but the analytic