Part One. Preface. 5 Definition of Truth. 8 In What Act of the Mind a Truth May Be Found Completely Possessed. 21 Definition of Certitude and of the States of Mind Falling Short of Certitude. 49 Kinds and Degrees of Certitudes 56 Metaphysical and Physical Certitude. 72 The Order of Precedence between Natural and Philosophic Certitude. 109 The Charge of Discord (or at least of want of co-operation) between Natural and Philosophic Certitude. 119 Universal Scepticism. 133 Cartesian Doubt. 146 The Primary Facts and Principles of the Logician. 160 Retrospect and Prospect. 178 The Rejection of Various Theories about the Ultimate Criterion of Certitude. 182 Evidence as the Ultimate Objective Criterion of Truth. 209 The Origin of Error in the Understanding. 224 Part Two. 239 Short Introduction. 239 The Trustworthiness of the Senses. 247 Objectivity of Ideas, Whether Singular or Universal. 287 Exaggerated Realism, Nominalism, and Conceptualism. 315 Consciousness. 322 Memory. 346 Belief on Human Testimony. 357 Belief on Divine Testimony. 370