In the history of human thought the name of ARISTOTLE must be written in capital letters. Of few of the Great Thinkers of history is it so true that he was one of what William James called “the folio editions of mankind.” In speaking of him, whether in praise or dispraise, it has been found almost impossible to avoid superlatives. The later ancients ranked the disciple level with his master Plato as occupying the twin summits of philosophical attainment. Since then they have divided the allegiance of the thinkers of the Western World. No doubt it is a rather wild judgment of Coleridge's that every man is born either a natural Platonist or a natural Aristotelian, but it is scarcely an exaggeration to say that no man has attained any width of knowledge or depth of reflection who is not driven to recognize, and often to express, a preference for the one over the other.