Published in 1987: The following essays form, as their title-page shows, only the first half of a collection which the writer hopes to complete in the course of a few months. Even when completed the whole work is designed to be merely preparatory to another on the interpretation of the Platonic Philosophy, and the materials brought together in the following pages, as well as those which, it is trusted, will form their continuation, were originally intended to appear in the Introduction to that projected work.