This journal provides immediate access to some articles. Volume 16(2); February 1930 Astronomy The Radial Velocities of Globular Clusters PMCID: PMC1075952 Chemistry Solid Protein Hydrochlorides PMCID: PMC1075953 The Structure of the Micas and Related Minerals PMCID: PMC1075954 The Decomposition of Nitrogen Pentoxide at Low Pressures PMCID: PMC1075955 Adsorption of Ammonia by Proteins PMCID: PMC1075956 Genetics The First Two Cases of Crossing-Over between Old-Gold and Bullata Factors in the Third Linkage Group of Oenothera PMCID: PMC1075950 Mathematics Determination of Some Properly Irregular Cyclotomic Fields PMCID: PMC1075957 On an Extension of the Fourier Theorem Giving Rapid Methods for Calculating the Constant Part and the Coefficient of Any Periodic Term in the Disturbing Function PMCID: PMC1075958 Content-Preserving Transformations PMCID: PMC1075959 Simplicity with Respect to Certain Quadratic Forms PMCID: PMC1075960 The Differential Geometry of a Continuous Infinitude of Contravariant functional Vectors PMCID: PMC1075961 Projective Functional Tensors and Other Allied Functionals PMCID: PMC1075962 Non-Abelian Groups Admitting More Than Half Inverse Correspondencies PMCID: PMC1075963 Linear Transformations in Hilbert Space: III. Operational Methods and Group Theory PMCID: PMC1075964 Physics On the Diamagnetism of Electrons in Metals PMCID: PMC1075948 On the Experimental Evidence of the Mosaic Structure of Bi-Single Crystals PMCID: PMC1075949 Zoölogy Somatic Segregation Produced by X-Rays in Drosophila Melanogaster PMCID: PMC1075951 Journal Matter Administrative content — journal masthead, notices, indexes, etc. | ||