This journal provides immediate access to some articles. Volume 39(6); June 1953 Biochemistry Serological Reactivity of Synthetic Polyglucoses PMCID: PMC1063807 A New Particle Type in Certain Connective Tissue Extracts PMCID: PMC1063808 Chemistry Hydrogen Bonded Helical Configurations of the Polypeptide Chain PMCID: PMC1063809 Genetics The Effect of a Suppressor on Allelic Inositolless Mutants in Neurospora Crossa PMCID: PMC1063810 The Effect of Pretreatment with Infra-Red Radiation on the X-ray Induced Sex-Linked Recessive Lethal and Visible Mutation Rate in Drosophila Melanogaster PMCID: PMC1063811 Mathematics A Theory of N-Person Games with Perfect Information PMCID: PMC1063812 The Spinor Connection in the Unified Einstein Theory of Relativity PMCID: PMC1063813 Connections Between Einstein's Two Unified Theories of Relativity PMCID: PMC1063814 On the Contraction of Groups and Their Representations PMCID: PMC1063815 Ergodic Property of the Brownian Motion Process PMCID: PMC1063816 Omnibus Checking of the 61-Place Table of Denary Logarithms Compiled by Peters and Stein, by Callet, and by Parkhurst PMCID: PMC1063817 Significance Levels for a Skew Distribution PMCID: PMC1063818 Physics Generalized Riemann Spaces and General Relativity PMCID: PMC1063819 A Theory of Ferromagnetism PMCID: PMC1063820 Equal Ratios of Energies of Nuclear Excited States of Even-Even Isotopes PMCID: PMC1063821 Psychology The Effect Upon Heart Rate Conditioning of Randomly Varying the Interval Between Conditioned and Unconditioned Stimuli PMCID: PMC1063822 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||