This journal provides immediate access to some articles. Volume 30(9); September 15, 1944 Astronomy Note on the Discovery of Red Stars PMCID: PMC1078705 Botany Antibiotic Activity of Lichens PMCID: PMC1078706 Genetics Genetic Linkage of Blood Types in the Rabbit PMCID: PMC1078699 Concerning Linkage of Waltzing in Rats PMCID: PMC1078700 Linkage of Waltzing in the Rat PMCID: PMC1078701 X-Ray Inhibition of Mitosis in Relation to Chromosome Number PMCID: PMC1078702 Experiments on Sexual Isolation in Drosophila: I. Geographic Strains of Drosophila Willistoni PMCID: PMC1078703 Mathematics Integral Formulas for the Characteristic Classes of Sphere Bundles PMCID: PMC1078709 On Groups of Automorphism of Lie Groups PMCID: PMC1078710 Groups Containing Less Than Twenty-Eight Non-Invariant Operators PMCID: PMC1078711 A Group-Theoretic Characterization of the General Projective Collineation Group PMCID: PMC1078712 Pathology and Bacteriology The Epidemic Curve with No Accession of Susceptibles PMCID: PMC1078708 Physics The Compressibility of Media under Extreme Pressures PMCID: PMC1078704 Physiology and Biochemistry Activity and Nutritional Deprivation PMCID: PMC1078707 | ||