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INTRODUCTORY NOTE.
marked "D." are taken from the translation of the "Republic" by Messrs Davies and Vaughan.
The other authorities most frequently consulted are Grote's 'Plato and the other Companions of Socrates,' Whewell's 'Platonic Dialogues,' Zeller's 'Socrates and the Socratic Schools,' and the Histories of Philosophy by Maurice, Ritter, and Ueberweg.
The writer also wishes to record his sense of the kindness of H. W. Chandler (Waynflete Professor of Moral Philosophy at Oxford), who was good enough to read through the proofs of the first four chapters of this volume.
