This journal provides immediate access to some articles. Volume 36(3); March 1950 Astronomy Galactic and Extragalactic Studies: XX. On the Distribution of 78,000 of the Brighter Northern Galaxies PMCID: PMC1063155 Biochemistry Evidence for the Participation of Kynurenine as a Normal Intermediate in the Biosynthesis of Niacin in Neurospora PMCID: PMC1063156 Genetics The Effect of Oxygen Concentration on the Rate of X-Ray Induced Mutations in Drosophila PMCID: PMC1063157 Mathematics Absolute and Unconditional Convergence in Normed Linear Spaces PMCID: PMC1063160 The Region of Values of the Derivative of a Schlicht Function PMCID: PMC1063161 A Generalization of Poisson's Distribution for Markoff Chains PMCID: PMC1063162 Almost Periodic Invariant Vector Sets in a Metric Vector Space PMCID: PMC1063163 On Membranes and Plates PMCID: PMC1063164 Sphere-Geometrical Unitary Field Theory PMCID: PMC1063165 Physics Some Remarks on the Infinite De Sitter Space PMCID: PMC1063158 Physiology The Effect of Seminal Plasma on Fertilized Rabbit Ova PMCID: PMC1063159 Correction On the Interpretation of Multi-Hit Survival Curves PMCID: PMC1063166 Corrects: On the Interpretation of Multi-Hit Survival Curves. Proc Natl Acad Sci U S A. 1949 December; 35(12): 696–709. Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||