I. Phenomena of Membrane Physiology -- A -- Invited Papers -- Transport of Metabolites -- Ion Transport in Excitable Cells -- Electrolyte and Water Transport across Epithelial Cells -- Some Aspects of the Functional Polarity of Epithelia -- Amino Acid Absorption through Intestinal Epithelium -- Some Biochemical Aspects of Amino Acid Transport -- Na+-Dependent Transport of Carbohydrates through Intestinal Epithelium -- Intestinal Absorption of Fat -- Contributed Papers -- Studies on the Intercellular Junctions of Mesothelium and Endothelium -- Energy Metabolism and Ion Transport Studied in Single Neurons -- Some Aspects of Glucose Transport in Kidney Cortex Slices -- Relationships between the Natriferic Action of Oxytocin and the Active Transport of Sodium through the Frog's Skin -- Effect of 5-Hydroxytryptamine on Sodium Transport across Bullfrog Skin -- Cellular Aspects of Membrane Permeability -- Role of Intestinal Disaccharidases in Sugar Transport -- Temporal Resolution of Heat Exchange during Action Potential of Nerve -- B: Secretion, Phagocytosis, and Intracellular Transport -- Invited Papers -- Energetics of Transport -- Exchange of Macromolecules between Nucleus and Cytoplasm -- Phagocytosis and Related Phenomena -- Active Ion Transport by Mitochondria -- Lysosomes and Phagosomes (The Vacuolar Apparatus) -- Contributed Papers -- The Nature of Thermodynamic Coupling in Transport Processes -- Contributed Papers -- The Effect of Metabolic Inhibitors on Pinocytosis in Amoebae -- Effects of Some Substances on Release of Acid Hydrolases of Rat Liver -- Distribution and Turnover of the Phosphatides in the Intracellular Membranes and in the Myelin Sheaths of the Rat Brain -- C: Transport and Drugs -- Invited Papers -- Enzymes, Drugs, and Transport Phenomena -- Transport of Drugs across Membranes -- Contributed Papers -- Transport of Biological Amines as an Element of Drug Action -- Effects of Insulin on Glucose Transport in Chick Embryo Heart -- Biophysical Aspects of Ionic Transfer across Membranes in Relation to the Mode of Action of Diuretics -- Absorption through Intestinal Epithelium as Influenced by Phospholipids -- Effect of Cardiac Glycosides on Active Na-K-Transport -- The Effect of Prostaglandin E1 on Free Fatty Acid Mobilization and Transport -- II Membrane Structure -- A: Molecular Organization of Unit Membrane -- Invited Papers -- Structure and Physical Chemistry of Membranes -- On the Lipid Composition of Membranes -- Interrelationship between Lipids and Proteins in Membranes -- Surface Properties of Molecular Aggregates of Micellar Size in Relation to Membrane Permeability and Adhesion -- Contributed Papers -- Monomolecular Films at Saline Fluorocarbon Interfaces -- Structural and Biochemical Features of Isolated Cell Surface Membranes -- Liquid Ion Exchange Membranes of Extreme Ionic Selectivity and High Transmissivity -- Lipid Interactions in Aqueous Surfaces, Membranes and Micellar Systems -- B: Membrane Models -- Invited Papers -- The Diffusion of Ions from a Phospholipid Model Membrane System -- Structural Role of Water in Lipoprotein Systems -- Experimental Bilayer Membrane Models -- Surface Lattices and Membrane Design -- Contributed Papers -- Possible Location of Phospholipids and Structural Protein in Mitochondrial Membranes -- Comparison of Theories of Teorell's Membrane Oscillator -- Electron Microscopy of Negatively-stained Lipids -- The Effects of Negative Stains on Lipids and Proteins Observed in the Electron Microscope -- Electron Microscopy of Fixed Lipids -- C: Electron Microscopy and X-ray Diffraction -- Invited Papers -- Origin of the Unit Membrane Concept -- X-ray Diffraction Studies of Cell Membranes -- The Structure of Cellular Membranes -- contributed Papers -- Specializations of the Unit Membrane -- Mitochondrial Cristae during Liver Regeneration -- Some Ultrastructural Aspects of Cell Membranes -- III. Mechanisms of Transport -- Invited Papers -- General Aspects of the Transport of Matter across Non-semipermeable Membranes -- Active Transport and Metabolism -- Chemical Control of Excitable Membranes during Electrical Activity -- Carrier Mechanisms -- The Enzymatic Basis for the Active Transport of Sodium and Potassium -- Contributed Papers -- Isolation of a Protein Coded for by the Permease Gene of the Lac Operon of Escherichia coli -- Evidence for a Carrier-mediated Transfer Model for the Accumulation of 14C-?-Aminobutyric Acid by Brain Particles at Zero Degrees Centigrade -- Sodium-dependent Metabolism and Transport of ?-Aminobutyric Acid in Subcellular Particles from Brain -- Countercurrent Principle -- Compartmental Models in the Analysis of Intestinal Absorption -- IV. Concluding Remarks -- Concluding Remarks at the "Symposium on Biophysics and Physiology of Biological Transport".