Preface. Preliminary: Plato's Sophist to be Reconsidered? Introduction. Chapters: 1. The Dispute about Interpreting Plato. 2. The Evolution of the Doctrine of Eidos. Reconsidering Plato's Sophist. 3. The Dialogue's Main Theme and Procedure. 4. On Current Views about ``What Is Not''. 5. On Current Views about ``What Is''. 6. Plato's Novel Metaphysical Position. 7. The Variety of Names and the Communion of Kinds. 8. An Important Digression on Dialectic. 9. The Communion of Kinds. 10. How the Five Kinds Combine. 11. The Reinstatement of ``What Is Not''. 12. On Philosophic and Sophistic Discourse. The Framework: Semantics and Philosophy in Plato. 13. Plato's Semantics in The Cratylus. 14. Naming and Representing. 15. Language and Knowing. 16. Semantics and Metaphysics. Bibliography. Index of Passages Quoted or Referred To. Index of Proper Names. Index of Terms and Topics.