[ PART I. ANTIQUITY ]

[ CHAPTER I. BEFORE SOCRATES ]

[ CHAPTER II. THE SOPHISTS ]

[ CHAPTER III. SOCRATES ]

[ CHAPTER IV. PLATO ]

[ CHAPTER V. ARISTOTLE ]

[ CHAPTER VI. VARIOUS SCHOOLS ]

[ CHAPTER VII. EPICUREANISM ]

[ CHAPTER VIII. STOICISM ]

[ CHAPTER IX. ECLECTICS AND SCEPTICS ]