Contents -- Preface -- Introduction: The Study of Ancient Philosophy -- Plato -- 1 Observations on Perception in Plato's Later Dialogues -- Aristotle -- 2 The Title, Unity, and Authenticity of the Aristotelian Categories -- 3 Categories in Aristotle -- 4 Individuals in Aristotle -- 5 Substance in Aristotle's Metaphysics -- 6 The Unity of General and Special Metaphysics: Aristotle's Conception of Metaphysics -- Stoics -- 7 Stoic vs. Aristotelian Syllogistic -- 8 The Original Notion of Cause -- 9 Stoics and Skeptics on Clear and Distinct Impressions -- Skeptics -- 10 The Skeptic's Beliefs -- 11 The Skeptic's Two Kinds of Assent and the Question of the Possibility of Knowledge -- Medicine -- 12 Philosophy and Medicine in Antiquity -- 13 The Ancient Empiricists -- 14 The Method of the So-Called Methodical School of Medicine -- 15 On Galen's Epistemology -- Grammar -- 16 Principles of Stoic Grammar -- 17 The Origins of Traditional Grammar -- Notes -- Index of Ancient Authors -- A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- Q -- R -- S -- T -- U -- V -- X -- Z -- Index of Subjects -- A -- B -- C -- D -- E -- F -- G -- H -- I -- K -- L -- M -- N -- O -- P -- R -- S -- T -- U -- V.