principles, and ascribed to these everything which happened anywhere. It would indeed have been unworthy a genius so curious, so penetrating, so fertile, so analytical as Aristotle's, to have laid it down that everything on the face of the earth could be accounted for by the material sciences, without the hypothesis of moral agents. It is incredible that in the investigation of physical results he could ignore so influential a being as man, or forget that, not only brute force and elemental movement, but knowledge also is power. And this so much the more, inasmuch as moral and spiritual agents belong to another, not to say a higher, order than physical; so that the omission supposed would not have been merely an oversight in matters of detail, but a philosophical error, and a fault in division.

However, we live in an age of the world when the career of science and literature is little affected by what was done, or would have been done, by this venerable