PREFACE: This edition, which is intended for those who have only lately begun the study of Greek, is based on the edition by my husband in the Pitt Press series. Where no simplification or abridgement seemed necessary, I have not hesitated to use the original wording, but the notes have been for the most part, and the introduction entirely, rewritten. A vocabulary has also been added. I have made considerable use of Mr H. Williamson's edition, published since my husband's lifetime. I am very glad that Professor Burnet's most interesting work, Greek Philosophy, Thales to Plato, appeared just in time to enable me to consult it when writing the introduction. A.M.A. Cambridge, 3 August 1914