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This journal provides immediate access to some articles. Volume 12(5); May 1926 Astronomy Radial Velocities of 368 Helium Stars PMCID: PMC1084541 Visual Observations of the Solar Atmosphere PMCID: PMC1084542 Chemistry Capillary Condensation and Adsorption PMCID: PMC1084543 Genetics Pollen Abortion in Chromosomal Types of Datura PMCID: PMC1084547 Geology The Compressibilities of Dunite and of Basalt Glass and Their Bearing on the Composition of the Earth PMCID: PMC1084540 Mathematics On Laguerre's Series: Third Note PMCID: PMC1084555 On Conformal Geometry PMCID: PMC1084556 Concerning Indecomposable Continua and Continua Which Contain No Subsets That Separate the Plane PMCID: PMC1084557 Physics Remarks on Penetrating Radiation PMCID: PMC1084548 New Evidence in Favor of a Dual Theory of Metallic Conduction PMCID: PMC1084549 The Magnetic Moment of the Electron PMCID: PMC1084550 A Theorem on Space Quantization PMCID: PMC1084551 On the Heat Capacity of Non-Polar Solid Compounds PMCID: PMC1084552 Systematic Relations between Electronic Structure and Band-Spectrum Structure in Diatomic Molecules: III. Molecule Formation and Molecular Structure PMCID: PMC1084553 On the Nature of Light PMCID: PMC1084554 Physiology The Physiological Principle of Minimum Work: II. Oxygen Exchange in Capillaries PMCID: PMC1084544 Zoölogy Nuclear Division in the Trophozoites of Endamoeba Histolytica PMCID: PMC1084545 The Effect of Hydrogen-Ion Concentration on Locomotion and Other Life-Processes in Amoeba Proteus PMCID: PMC1084546 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||