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Volume 25(9);  September 1939
The cover of the journal
Astronomy
The Gravitational Motion of a Pair of Rigid Bodies
Theodore Eugene Sterne
Proc Natl Acad Sci U S A. 1939 September; 25(9): 468–474.
PMCID: PMC1077948
Botany
Developmental Changes in Apical Meristems
W. Gordon Whaley
Proc Natl Acad Sci U S A. 1939 September; 25(9): 445–448.
PMCID: PMC1077943
Chemistry
The Synthesis of Sulfonyl Chlorides by Chlorination of Sulphur Compounds
Treat B. Johnson
Proc Natl Acad Sci U S A. 1939 September; 25(9): 448–452.
PMCID: PMC1077944
Development of Eye-Colors in Drosophila: Bacterial Synthesis of v + Hormone
Edward L. Tatum
Proc Natl Acad Sci U S A. 1939 September; 25(9): 486–490.
PMCID: PMC1077952
Nutritional Requirements of Drosophila Melanogaster
E. L. Tatum
Proc Natl Acad Sci U S A. 1939 September; 25(9): 490–497.
PMCID: PMC1077953
Genetics
Hybridization and Tumor Formation in Mice
C. C. Little
Proc Natl Acad Sci U S A. 1939 September; 25(9): 452–455.
PMCID: PMC1077945
Nuclease Action, Protease Action and Histochemical Tests on Salivary Chromosomes of Drosophila
Daniel Mazia and Lucena Jaeger
Proc Natl Acad Sci U S A. 1939 September; 25(9): 456–461.
PMCID: PMC1077946
Mathematics
A Theory of Length and Its Applications to the Calculus of Variations
Karl Menger
Proc Natl Acad Sci U S A. 1939 September; 25(9): 474–478.
PMCID: PMC1077949
General Trihornometry of Second Order
Edward Kasner and John De Cicco
Proc Natl Acad Sci U S A. 1939 September; 25(9): 479–481.
PMCID: PMC1077950
Groups Which Contain Less Than Ten Proper Subgroups
G. A. Miller
Proc Natl Acad Sci U S A. 1939 September; 25(9): 482–485.
PMCID: PMC1077951
Psychology and Anthropology
Adjusted Death Rates
Carl R. Doering and Alice L. Forbes
Proc Natl Acad Sci U S A. 1939 September; 25(9): 461–467.
PMCID: PMC1077947
Journal Matter
Administrative content — journal masthead, notices, indexes, etc.
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