Publisher's "From the outset, Greek philosophers were concerned with the distinction between appearance and reality, and all the differences in their philosophic systems were due ultimately to differences in their views of this distinction. This history of Greek rationalism is, then, actually a study of the changing basis of Greek philosophy. Within a chronological scheme, Dr. Boas is concerned at each stage with four main the distinction between appearance and reality; the method used to establish the distinction; the appraisal of life made by the men studied; and their ethical theories. Unlike most such studies, this volume focuses on a central philosophical question and applies this question systematically throughout the whole history of Greek philosophy. Re-reading the Greek texts in their original, Dr. Boas has gone beyond the texts to show them in their relation to the development of Western thought as a whole."