For the Third Edition, Professor Allen has provided new translations of Socrates' speech in the Symposium and of the first five chapters of Aristotle's Categories, as well as new selections bearing on Aristotle's Theory of Infinity, Continuity, and Discreteness. The book also contains a general introduction which sets forth Professor Allen's distinctive and now widely accepted interpretation of the development of Greek philosophy and science, along with selective bibliography, and lists of suggested readings.