Plato e-bog

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. I have to thank my colleague Professor J. Burnet and Mr. John Sime of this University and of Balliol College, Oxford, for their kindness in looking through my proofs, and for several important suggestions. I must, however, take upon myself the full responsibility for the Opinions I have adopted, and for any errors that may, have been overlooked in the references and citations, or in the use made of them.