This journal provides immediate access to some articles. Volume 28(2); February 1942 Botany Comparative Rates of Division in Large and Small Cells of Developing Fruits PMCID: PMC1078403 Genetics Chromosome Degeneration in Relation to Growth and Hybrid Vigor PMCID: PMC1078404 Temperature and “Sex-Ratio” in Drosophila Pseudoöbscura PMCID: PMC1078405 Mathematics A General Theorem on the Initial Curvature of Dynamical Trajectories PMCID: PMC1078406 Generalized Transformation Theory of Isothermal and Dual Families PMCID: PMC1078407 Concerning Separability PMCID: PMC1078408 The Coefficients of Stirling's Series for Log Γ(x) PMCID: PMC1078409 Oscillations of the Derivatives of a Function PMCID: PMC1078410 Zoölogy Relative Effects of X-Rays and Neutrons on Chromosomes in Different Parts of the “Resting Stage” PMCID: PMC1078402 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||