This journal provides immediate access to some articles. Volume 24(4); April 1938 Genetics Intersexuality in Drosophila Virilis and Its Bearing on Sex Determination PMCID: PMC1077059 Mathematics The Generalized Clebsch-Gordan Formula PMCID: PMC1077062 The Analysis of Representations of the Real Orthogonal Group PMCID: PMC1077063 Natural Systems PMCID: PMC1077064 Extensions of Measure PMCID: PMC1077065 Representation and Equivalence of Forms PMCID: PMC1077066 Physiology The Sedimentation Constant of Visual Purple PMCID: PMC1077060 Zoölogy Biological Differences in the Action of Synthetic Male Hormones on the Differentiation of Sex in the Chick Embryo PMCID: PMC1077061 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||