This journal provides immediate access to some articles. Volume 19(12); December 1933 Astronomy Summary of a Variable Star Survey in an External Galaxy PMCID: PMC1086269 The Terrestrial Abundance of the Permanent Gases PMCID: PMC1086270 On the Linear Diameters of 125 Large Galaxies PMCID: PMC1086271 Chemistry Separation of Hydrogen Isotopes by Diffusion through Palladium PMCID: PMC1086268 Genetics Linkage Interrelations of Three Genes for Rex (Short) Coat in the Rabbit PMCID: PMC1086272 The Gene Theory in Relation to Blending Inheritance PMCID: PMC1086273 The Effect of X-Ray Dosage on Sterility and Number of Lethals in Drosophila melanogaster PMCID: PMC1086274 The Specific Formula of Heredity PMCID: PMC1086275 A Cytogenetical Study of a Reciprocal Translocation in Zea PMCID: PMC1086276 A Secondary Trisome in Maize PMCID: PMC1086277 Mathematics A Duality in Interpolation to Analytic Functions by Rational Functions PMCID: PMC1086281 Groups Involving a Small Number of Squares PMCID: PMC1086282 A Theory for *-Operators Analogous to the Theory of Reducibility for Self-Adjoint Transformations in Hilbert Space PMCID: PMC1086283 Physics On the Temperature Dependence of Ferro-Magnetic Saturation PMCID: PMC1086280 Psychology On Overlap PMCID: PMC1086279 Zoölogy The Color Changes of Elasmobranch Fishes PMCID: PMC1086278 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||