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Volume 28(4);  April 1942
The cover of the journal
Astronomy
The Calculation of Rotation Factors for Eclipsing Binary Systems
Zdenĕk Kopal
Proc Natl Acad Sci U S A. 1942 April; 28(4): 133–140.
PMCID: PMC1078433
Bacteriology
The Identification and Characterization of Bacteriophages with the Electron Microscope
S. E. Luria and Thomas F. Anderson
Proc Natl Acad Sci U S A. 1942 April; 28(4): 127–130.1.
PMCID: PMC1078431
Botany
Concentration of Growth Hormone and Fruitfulness in the Montmorency Cherry
Felix G. Gustafson
Proc Natl Acad Sci U S A. 1942 April; 28(4): 131–133.
PMCID: PMC1078432
Genetics
An Autosomal Recessive Factor Inducing Semi-Sterility in Drosophila Melanogaster Females
U. Fano
Proc Natl Acad Sci U S A. 1942 April; 28(4): 119–123.
PMCID: PMC1078429
“Ataxia,” a Hereditary Nervous Disorder of the Rabbit
P. B. Sawin, M. V. Anders, and R. B. Johnson
Proc Natl Acad Sci U S A. 1942 April; 28(4): 123–127.
PMCID: PMC1078430
Mathematics
Certain Direct Products of the Groups of Self-Isometries
G. A. Miller
Proc Natl Acad Sci U S A. 1942 April; 28(4): 141–144.
PMCID: PMC1078434
Certain Congruence Criteria Connected with Fermat's Last Theorem
H. S. Vandiver
Proc Natl Acad Sci U S A. 1942 April; 28(4): 144–150.
PMCID: PMC1078435
Physics
On the Physical Characteristics of the Hydra Cluster of Nebulae
F. Zwicky
Proc Natl Acad Sci U S A. 1942 April; 28(4): 150–155.
PMCID: PMC1078436
Journal Matter
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