Introduction; Chapter 1 Inadequate Psychological Data of the Current Philosophic Theory of Knowledge; Chapter 2 Chief Flaws of the Traditional “Philosophic” Approach. General Features of an Adequate Psychology of Knowledge; Chapter 3 Experiential Basis for the Distinction between Truth and Falsity. The Dynamics of Expanding Knowledge and Growing Logic; Chapter 4 Experiential Basis for Our Belief in the Objective World (I); Chapter 5 Experiential Basis for Our Belief in the Objective World (2); Chapter 6 Experiential Basis for Our Belief in Causality; Chapter 7 The Psychology of Puzzlement and of Explanation; Chapter 8 The Bearings of an Adequate Psychology of Knowledge on the Philosophic Theory of Knowledge;