The present volume is the Ph D thesis of Samuel Scolnicov, co-founder of the International Plato Society, published posthumously to illustrate the foundation of his interest in the 'core Plato'. The issues raised in this thesis are now of wider interest than they were then and many of his theses have found wider acceptance. The book is edited by Harold Tarrant, long-time colleague and friend of Samuel Scolnicov and preceded by a foreword not only by the editor, but also the authoris niece, Hanna Scolnicov, giving a more personal and detailed introduction to the author behind the thesis and putting his achievements into a broader perspective.