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Volume 33(7);  July 1947
The cover of the journal
Chemistry
Forces Between Polyatomic Molecules
J. H. Hildebrand
Proc Natl Acad Sci U S A. 1947 July; 33(7): 201–204.
PMCID: PMC1079026
Genetics
Influence of Humidity on the Survival of Different Chromosomal Types in Drosophila Pseudoobscura
M. J. Heuts
Proc Natl Acad Sci U S A. 1947 July; 33(7): 210–213.
PMCID: PMC1079028
Mathematics
Perturbations of Discontinuous Solutions of Non-Linear Systems of Differential Equations
Norman Levinson
Proc Natl Acad Sci U S A. 1947 July; 33(7): 214–218.
PMCID: PMC1079029
Pathology
Urethane (Ethyl Carbamate) Therapy in Spontaneous Leukemias in Mice
L. W. Law
Proc Natl Acad Sci U S A. 1947 July; 33(7): 204–210.
PMCID: PMC1079027
Physics
A Minimum Problem About the Motion of a Solid Through a Fluid
G. Pólya
Proc Natl Acad Sci U S A. 1947 July; 33(7): 218–221.
PMCID: PMC1079030
Journal Matter
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