This journal provides immediate access to some articles. Volume 24(9); September 1938 Biophysics The Mechanism of Delayed Killing of Maize Seeds with X-Radiation PMCID: PMC1077119 Botany Contact Effects between Plant Roots and Soil Colloids PMCID: PMC1077120 Genetics Facet Number and the v+ Hormone in the Bar Eye of Drosophila Melanogaster PMCID: PMC1077116 An X-Ray Induced Intercalary Duplication in Drosophila Involving Union of Sister Chromatids PMCID: PMC1077117 The Distribution of Gene Frequencies in Populations of Polyploids PMCID: PMC1077118 Mathematics On Locally Connected Sets and Retracts PMCID: PMC1077121 Conformal Geometry of Horn Angles of Second Order PMCID: PMC1077122 Statistics A Skeleton Life Table PMCID: PMC1077123 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||