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Volume 31(2);  February 1945
The cover of the journal
Genetics
Experiments on Sexual Isolation in Drosophila: IV. Modification of the Degree of Isolation Between Drosophila Pseudoobscura and Drosophila Persimilis and Sexual Preferences in Drosophila Prosoltans
Ernst Mayr and Th. Dobzhansky
Proc Natl Acad Sci U S A. 1945 February; 31(2): 75–82.
PMCID: PMC1078756
Dominance Modification and Physiological Effects of Genes
L. C. Dunn and S. Gluecksohn-Schoenheimer
Proc Natl Acad Sci U S A. 1945 February; 31(2): 82–84.
PMCID: PMC1078757
Relative Sensitivity of Chromosomes to Neutrons and X-Rays: III. Comparison of Carcinoma and Lymphosarcoma in the Rat
A. Marshak and Muriel Bradley
Proc Natl Acad Sci U S A. 1945 February; 31(2): 84–90.
PMCID: PMC1078758
Mathematics
Concerning Tangents to Continua in the Plane
R. L. Moore
Proc Natl Acad Sci U S A. 1945 February; 31(2): 67–70.
PMCID: PMC1078754
Torus Homotopy Groups
Ralph H. Fox
Proc Natl Acad Sci U S A. 1945 February; 31(2): 71–74.
PMCID: PMC1078755
Journal Matter
Original table of contents page
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