Frontmatter -- TRANSLATOR'S PREFACE -- AUTHOR'S PREFACE -- CONTENTS -- BOOK I. THE BEGINNINGS -- INTRODUCTION -- CHAPTER I. THE OLD IONIAN NATURE-PHILOSOPHERS -- CHAPTER II. ORPHIC SYSTEMS OF COSMOGONY -- CHAPTER III. PYTHAGORAS AND HIS DISCIPLES -- CHAPTER IV. THE DEVELOPMENT OF THE PYTHAGOREAN DOCTRINE -- CHAPTER V. ORPHIC AND PYTHAGOREAN DOCTRINES OF THE SOUL -- BOOK II. FROM METAPHYSICS TO POSITIVE SCIENCE -- CHAPTER I. XENOPHANES -- CHAPTER II. PARMENIDES -- CHAPTER III. THE DISCIPLES OF PARMENIDES -- CHAPTER IV. ANAXAGORAS -- CHAPTER V. EMPEDOCLES -- CHAPTER VI. THE HISTORIANS -- BOOK III. THE AGE OF ENLIGHTENMENT -- CHAPTER I. THE PHYSICIANS -- CHAPTER II. THE ATOMISTS -- CHAPTER III. THE ECLECTIC PHILOSOPHERS OF NATURE -- CHAPTER IV. THE BEGINNINGS OF MENTAL AND MORAL SCIENCE -- CHAPTER V. THE SOPHISTS -- CHAPTER VI. PROTAGORAS OF ABDERA -- CHAPTER VII. GORGIAS OF LEONTINI -- CHAPTER VIII. THE ADVANCE OF HISTORICAL SCIENCE -- NOTES AND ADDITIONS -- INDEX