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Volume 28(7);  July 1942
The cover of the journal
Botany
Synthesis of Vitamins by Intestinal Bacteria
Paul R. Burkholder and Ilda McVeigh
Proc Natl Acad Sci U S A. 1942 July; 28(7): 285–289.
PMCID: PMC1078469
Chemistry
Purines as Growth Requirements of Spirillum Serpens
Derrol E. Pennington
Proc Natl Acad Sci U S A. 1942 July; 28(7): 272–276.
PMCID: PMC1078466
Genetics
Chromosomes of the Red Fox
Louise Wipf and Richard M. Shackelford
Proc Natl Acad Sci U S A. 1942 July; 28(7): 265–268.
PMCID: PMC1078464
Salivary Gland Type Chromosomes in Mosquitoes
Eileen Sutton
Proc Natl Acad Sci U S A. 1942 July; 28(7): 268–272.
PMCID: PMC1078465
Mathematics
Stationary Points of Transformation Groups
P. A. Smith
Proc Natl Acad Sci U S A. 1942 July; 28(7): 293–297.
PMCID: PMC1078471
Note on the t-Test
Edwin B. Wilson and Jane Worcester
Proc Natl Acad Sci U S A. 1942 July; 28(7): 297–301.
PMCID: PMC1078472
Physics
The Distribution of Metallic Atoms in Two-Component Glasses
Joseph S. Lukesh
Proc Natl Acad Sci U S A. 1942 July; 28(7): 277–281.
PMCID: PMC1078467
A New Fourier Series Technique for Crystal Structure Determination
M. J. Buerger
Proc Natl Acad Sci U S A. 1942 July; 28(7): 281–285.
PMCID: PMC1078468
Psychology
Theory of the Effects of Light Intensity and Duration in Determining Visual Responses
N. R. Bartlett and G. E. Hudson
Proc Natl Acad Sci U S A. 1942 July; 28(7): 289–292.
PMCID: PMC1078470
Journal Matter
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