This journal provides immediate access to some articles. Volume 38(1); January 1952 Astronomy A New Discussion of the Changes in the Earth's Rate of Rotation PMCID: PMC1063490 Biochemistry Gastric Anion Exchange: Its Relation to the Immediate Mechanism of Hydrochloric Acid Secretion PMCID: PMC1063491 A Hemochromogen Component of Liver Microsomes PMCID: PMC1063492 Botany Nuclear Studies on the Myxophyceae, a Preliminary Report PMCID: PMC1063499 Chemistry Configurations of Polypeptide Chains with Equivalent Cis Amide Groups PMCID: PMC1063506 Genetics Incomplete Genetic Blocks in Biochemical Mutants of Neurospora PMCID: PMC1063493 The Effects of Carbon Monoxide and Oxygen on the Frequency of X-Ray Induced Chromosome Aberrations in Tradescantia PMCID: PMC1063494 Studies on a Suppressor of Non-Allelic Acetate-Requiring Mutants of Neurospora PMCID: PMC1063495 Carotenoid Differences in Tomatoes PMCID: PMC1063496 Mathematics On Certain Diophantine Equations in Rings and Fields PMCID: PMC1063497 A Remark on Cavitational Flow PMCID: PMC1063498 Inequalities for Complex Linear Differential Systems of the Second Order PMCID: PMC1063500 A Topological Characterization of the Length of Paths PMCID: PMC1063501 The Element of Volume of the Rotation Group PMCID: PMC1063502 Cauchy's Formula on Kähler Manifolds PMCID: PMC1063504 Pathology Effect of Bilateral Adrenalectomy on Certain Human Tumors PMCID: PMC1063503 Psychology Spectral Sensitivity of the Cones in the Dark Adapted Human Eye PMCID: PMC1063505 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||