This journal provides immediate access to some articles. Volume 27(6); June 15, 1941 Astronomy On a Cluster of Nebulae in Hydra PMCID: PMC1078319 Chemistry Riboflavin Contents of Tissues as Stabilized in the Adult at Liberal Levels of Intake PMCID: PMC1078323 The Physico-Chemical Structure of the Salivary Gland Chromosomes: II PMCID: PMC1078324 Certain Singular Points on Crystallization Curves of Solid Solutions PMCID: PMC1078325 Genetics Dominant vs. Recessive Lethal Mutation PMCID: PMC1078315 Linkage Studies of the Rat (Rattus Norvegicus): IV PMCID: PMC1078316 The Effect of Adult Body Color Mutations upon the Larva of Drosophila Melanogaster PMCID: PMC1078317 Mathematics A Generalization of the Euclidian Algorithm to Several Dimensions PMCID: PMC1078326 On the Problem of Analyticity in Dynamics PMCID: PMC1078327 A Generalization of Fréchet's Differential PMCID: PMC1078328 A Generalization of the Dirac Equations PMCID: PMC1078329 Generalization of Completely Convex Functions PMCID: PMC1078330 Natural Systems: The Structure of Abstract Monotone Sequences PMCID: PMC1078331 The Method of the Minimum Integral and Analytic Continuation of Functions of Complex Variables PMCID: PMC1078332 Physics Invariant Forms of Interaction between Nuclear Particles PMCID: PMC1078322 Physiology and Biochemistry The Spermatophores of Triturus Torosus and Triturus Rivularis PMCID: PMC1078318 Enzymes in Ontogenesis: XVI. Activation of Protyrosinase by Sodium Alkyl Sulfates, PMCID: PMC1078320 Zoölogy and Anatomy Field Properties of the Developing Frog's Egg PMCID: PMC1078321 | ||