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This journal provides immediate access to some articles. Volume 6(7); July 1920 Article Report of the Annual Meeting PMCID: PMC1084571 Biology Analytical Note on Certain Rhythmic Relations in Organic Systems PMCID: PMC1084562 Botany The Influence of Cold in Stimulating the Growth of Plants PMCID: PMC1084568 Engineering Shock or Water Ram in Pipe Lines with Imperfect Reflection at the Discharge End and Including the Effects of Friction and Non-Uniform Change of Valve Opening PMCID: PMC1084570 Genetics Observations on the Sterility of Mutant Hybrids in Drosophila Virilis PMCID: PMC1084564 Mathematics On the Class Number of the Field Ω(e2iπ/pn) and the Second Case of Fermat's Last Theorem PMCID: PMC1084563 Physics On the Nature of the Negative Carriers Produced in Pure Hydrogen and Nitrogen by Photo-Electrons PMCID: PMC1084569 Physiology The Dynamics of a Fluctuating Growth Rate PMCID: PMC1084561 Statistics On a Single Numerical Index of the Age Distribution of a Population PMCID: PMC1084566 Zoology Studies on the Transformation of the Intestinal Flora, with Special Reference to the Implantation of Bacillus Acidophilus: I. Feeding Experiments with Albino Rats PMCID: PMC1084565 Upon an Important Method of Studying Problems of Relationship and of Geographical Distribution PMCID: PMC1084567 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||
