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Volume 25(12);  December 1939
The cover of the journal
Astronomy
On the Formation of Clusters of Nebulae and the Cosmological Time Scale
F. Zwicky
Proc Natl Acad Sci U S A. 1939 December; 25(12): 604–609.
PMCID: PMC1077981
Genetics
On a Method for Testing Linkage between Lethal Genes
W. E. Castle
Proc Natl Acad Sci U S A. 1939 December; 25(12): 593–594.
PMCID: PMC1077978
The Gas Exchange of Drosophila Larvae
George T. Rudkin
Proc Natl Acad Sci U S A. 1939 December; 25(12): 594–599.
PMCID: PMC1077979
Geology and Paleontology
Occurrence of Cretaceous Reptiles in the Moreno Shales of the Southern Coast Ranges, California
Chester Stock
Proc Natl Acad Sci U S A. 1939 December; 25(12): 617–620.
PMCID: PMC1077983
Mathematics
On Cauchy's Integral Theorem in the Real Plane
Karl Menger
Proc Natl Acad Sci U S A. 1939 December; 25(12): 621–625.
PMCID: PMC1077984
An Ergodic Theorem for General Semi-Groups
Garrett Birkhoff
Proc Natl Acad Sci U S A. 1939 December; 25(12): 625–627.
PMCID: PMC1077985
General Ergodic Theorems
L. Alaoglu and G. Birkhoff
Proc Natl Acad Sci U S A. 1939 December; 25(12): 628–630.
PMCID: PMC1077986
Solution of the Inverse Problem of the Calculus of Variations
Jesse Douglas
Proc Natl Acad Sci U S A. 1939 December; 25(12): 631–637.
PMCID: PMC1077987
The Generality of Finite Abstract Complexes
William W. Flexner
Proc Natl Acad Sci U S A. 1939 December; 25(12): 637–639.
PMCID: PMC1077988
Groups Having a Small Number of Sets of Conjugate Subgroups
G. A. Miller
Proc Natl Acad Sci U S A. 1939 December; 25(12): 640–643.
PMCID: PMC1077989
The Algebraic Structure of Complexes
A. W. Tucker
Proc Natl Acad Sci U S A. 1939 December; 25(12): 643–647.
PMCID: PMC1077990
Concerning Accessibility
R. L. Moore
Proc Natl Acad Sci U S A. 1939 December; 25(12): 648–653.
PMCID: PMC1077991
Physics
Scattering of Slow Neutrons by Protons
Milton S. Plesset and Frederick W. Brown
Proc Natl Acad Sci U S A. 1939 December; 25(12): 600–604.
PMCID: PMC1077980
Psychology and Anthropology
Bodily Constitution and Human Longevity
Raymond Pearl and W. Edwin Moffett
Proc Natl Acad Sci U S A. 1939 December; 25(12): 609–616.
PMCID: PMC1077982
Journal Matter
Administrative content — journal masthead, notices, indexes, etc.
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