This journal provides immediate access to some articles. Volume 36(12); December 1950 Astronomy The Theory of Micro-Meteorites: Part I. In an Isothermal Atmosphere PMCID: PMC1063272 Biochemistry Mercaptan-Induced Coagulation of Proteins PMCID: PMC1063273 The Action Spectrum of the Inhibition of Galactozymasb Production by Ultraviolet Light PMCID: PMC1063274 Genetics The Structure of the Heterochromatic Part of the Y-Chromosome in Drosophila Buscki PMCID: PMC1063275 Experiments with the Chemostat on Spontaneous Mutations of Bacteria PMCID: PMC1063276 The Analysis of a Case of Cross-Sterility in Maize PMCID: PMC1063277 The Use of Sodium Nucleate in the Study of the Mutagenic Activity of Acriflavine in Escherichia Coli PMCID: PMC1063278 Geophysics The Nature of Bone and Phosphate Rock PMCID: PMC1063279 Mathematics Some Linear Operators in the Theory of Partial Differential Equations PMCID: PMC1063281 Generalized Group Algebras PMCID: PMC1063282 Limit Cycles of Systems of the Second Order PMCID: PMC1063283 On the Addition and Multiplication Theorems for Special Functions PMCID: PMC1063284 Physics Limitation of Electron Density by the Patterson Function PMCID: PMC1063280 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||