With this book, Professor Guthrie completed his six-volume A History of Greek Philosophy in the course of which he surveyed the whole field of Greek philosophy from the Presocratics to Aristotle. The History has won acclaim for the author's ability to take on a vast and challenging subject and to produce an account of it remarkable for its combination of learning with clarity of exposition. This is a book for students of classics and Greek philosophy, and indeed for anyone interested in reading a clear account of Aristotle's thought.