Perception and Philosophy Science -- (1) Nature of a Perceptual Theory -- (2) The Psychophysical Law -- (3) Perception of Light and Color -- (4) Perception of Voice and Music -- (5) Theory of Space and Time -- (6) Statistical Theory of Fields -- (7) The Problem of the Unity of Physics -- (8) Nature of a Physical Theory -- (9) A Theory of Psycho-social Evolution -- The Interpretation of Quantum Mechanics -- Defense of a Non-Conventionalist Interpretation of Classical Mechanics -- Comments on C. A. Hooker: Systematic Realism -- The Formal Representation of Physical Quantities -- Comments on 'The Formal Representation of Physical Quantities' -- Comments on 'The Formal Representation of Physical Quantities' -- The Labyrinth of Quantum Logics -- Ontic Commitments of Quantum Mechanics -- Comments on 'Ontic Commitments of Quantum Mechanics' -- Quantum Logic and Classical Logic: Their Respective Roles -- Implications of a New Axiom Set for Quantum Logic -- Two Types of Continuity -- General Relativity - Some Puzzling Questions -- Personal Remembrance of Albert Einstein -- The Controversy Concerning the Law of Causality in Contemporary Physics -- Topical Table of Contents -- (1) Causality -- (2) Relevance of Probability -- (3) Teleology in Physics? -- (4) Probability and Free Will.