Partial table of contents: POLYMER CHEMISTRY. Intramolecular Reactions in Vinyl Polymers as a Means of Investigation of the Propagation Step (E. Merz, et al.). Relative Reactivities in Vinyl Copolymerization (T. Alfrey & C. Price). Commentary: Reflections on "Recent Developments in Polymerization by an Alternating Intra-Intermolecular Mechanism" (G. Butler). Commentary: Relections on "General Theory of Stationary Random Sequences with Applications to the Tacticity of Polymers" (B. Coleman & T. Fox). Aromatic Polypyromellitimides from Aromatic Polyamic Acids (C. Sroog, et al.). Liquid Crystal Polymers. I. Preparation and Properties of p-Hydroxybenzoic Acid Copolyesters (W. Jackson & H. Kuhfuss). Photoinitiated Cationic Polymerization with Triarylsulfonium Salts (J. Crivello & J. Lam). POLYMER PHYSICS. Simple Presentation of Network Theory of Rubber, with a Discussion of Other Theories (H. James & E. Guth). The Melting Points of Chain Polymers (C. Bunn). Theory of the Interface between Immiscible Polymers (E. Helfand & Y. Tagami). Crazing and Shear Deformation in Crosslinked Polystyrene (C. Henkee & E. Kramer).