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This journal provides immediate access to some articles. Volume 25(1); January 1939 Astronomy The Physical State of the Interstellar Gas Clouds PMCID: PMC1077703 Botany Vitamin B6, a Growth Substance for Excised Tomato Roots PMCID: PMC1077695 Chemistry Experiments on the Relation of Nutrition to the Composition of the Body and the Length of Life PMCID: PMC1077700 Genetics The Induction by Irradiation with Neutrons of Hereditary Changes in Mice PMCID: PMC1077698 Imaginal Differentiation Inaugurated by Oxygen in Drosophila Pupae PMCID: PMC1077699 Mathematics Groups of Degree n in Which the Largest Degree of a Substitution is a Minimum PMCID: PMC1077704 Euler's Concordant Forms PMCID: PMC1077705 On the Mapping of Abstract Spaces on Polytopes PMCID: PMC1077706 The Intrinsic Metric of a Polytope PMCID: PMC1077707 On the Concept of a Topological Space PMCID: PMC1077708 Physics Photomicrographs of Thin Bone Sections by the Use of Fluorescence X-Radiation PMCID: PMC1077697 Physiology and Biochemistry Chemical Restoration in Nitella: III. Effects of Inorganic Salts PMCID: PMC1077696 Psychology and Anthropology The Resolution of Tests into Two General Factors PMCID: PMC1077701 The Steady Polarity Potential of the Human Eye PMCID: PMC1077702 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||