This journal provides immediate access to some articles. Volume 23(7); July 1937 Anthropology and Psychology The Cancellation, Reinforcement and Measurement of Subjective Tones PMCID: PMC1076952 Astronomy Note on Galactic Structure: The Milky Way from Aquila to Cygnus PMCID: PMC1076949 Botany Thiazole and the Growth of Excised Tomato Roots PMCID: PMC1076945 Chemistry Pyrimidine and Thiazole Intermediates as Substitutes for Vitamin B1 PMCID: PMC1076946 The Structure of Langmuir-Blodgett Films of Stearic Acid PMCID: PMC1076947 Genetics Compressed Deficiency and the Location of the Spindle Attachment in the X-Chromosome of Drosophila Pseudoöbscura PMCID: PMC1076938 Ovary Transplants in Drosophila Melanogaster: Meiosis and Crossing-Over in Superfemales PMCID: PMC1076939 An Effect of the Y-Chromosome on the Sex-Ratio of Interracial Hybrids of Drosophila Pseudoöbscura PMCID: PMC1076940 Geology and Paleontology A Peccary Skull from the Barstow Miocene, California PMCID: PMC1076948 Mathematics Some Results in the Arithmetic Theory of Algebraic Functions of Several Variables PMCID: PMC1076950 Binary Quadratic Discriminants with a Single Class of Reduced Forms in Each Genus PMCID: PMC1076951 Pathology and Bacteriology The Production of Sterility in Male Mice by Irradiation with Neutrons PMCID: PMC1076943 Physiology and Biochemistry The Effect of X-Rays on Chromosomes in Mitosis PMCID: PMC1076941 The Action of Certain Substituted Phenols on Marine Eggs in Relation to Their Dissociation PMCID: PMC1076942 Zoölogy and Anatomy Sex, Sex Inheritance and Sex Determination in Paramecium Aurelia PMCID: PMC1076944 Journal Matter Administrative content — journal masthead, notices, indexes, etc. | ||