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This journal provides immediate access to some articles. Volume 13(6); June 1927 Astronomy Ultra-Violet Solar Radiation PMCID: PMC1085021 On the Distance of the Sun from the Galactic Plane PMCID: PMC1085022 The Relationship of Spectral Type to Period among Variable Stars PMCID: PMC1085023 High Dispersion Stellar Spectra and Some Results of a Study of γ Cygni PMCID: PMC1085024 Botany Hermaphroditism in a Dioicous Hepatic PMCID: PMC1085016 Chemistry Magnetic Hydrogen Atoms and Non-Magnetic Molecules PMCID: PMC1085019 The Relation of the Octet of Electrons to Ionization PMCID: PMC1085020 Engineering Mineralogical Content of Maine Sands in Relation to Mortar Strength PMCID: PMC1085013 Mathematics Groups of Collineations in a Space of Paths PMCID: PMC1085025 Physics Remarks on the Quantum Theory of Diffraction PMCID: PMC1085026 Absolute Intensities in the Hydrogen-Chloride Rotation Spectrum PMCID: PMC1085027 Note on “Pendulum” Orbits in Atomic Models PMCID: PMC1085028 Measurement of the Mo.K Doublet Distances by Means of the Double X-Ray Spectrometer PMCID: PMC1085029 The Structure of the Helium Atom: I PMCID: PMC1085030 The Zeeman Effect of the Hyper-Fine Structure Components of λ 2537 of Mercury PMCID: PMC1085031 The Dielectric Constant of Atomic Hydrogen in Undulatory Mechanics PMCID: PMC1085032 The Dielectric Constant of Atomic Hydrogen from the Point of View of Bohr's Quantum Theory PMCID: PMC1085033 Direct and Indirect Production of Characteristic X-Rays PMCID: PMC1085034 Mucronate Electrode with Micrometer PMCID: PMC1085035 The Reflection of Electrons from Crystals PMCID: PMC1085036 Coupling of Electronic and Nuclear Motions in Diatomic Molecules PMCID: PMC1085037 Wave Mechanics and the Normal State of the Hydrogen Molecule PMCID: PMC1085038 A New Equation for the Distribution of Radiant Energy PMCID: PMC1085039 The Hydrogen Atom with a Spinning Electron in Wave Mechanics PMCID: PMC1085040 Physiology On the Mechanics of Blood Flow, with Special Reference to the Influence of Change of Posture PMCID: PMC1085014 The Nature of the Insensible Perspiration PMCID: PMC1085015 Zoölogy Modifications of Nerve Centers Due to the Transplantation of the Eye and Olfactory Organ in Anuran Embryos PMCID: PMC1085017 On the Growth, Care and Behavior of Loggerhead Turtles in Captivity PMCID: PMC1085018 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||