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Volume 28(5);  May 1942
The cover of the journal
Astronomy
Galactic and Extragalactic Studies: XIII. Note on the Comparative Diameters of Spheroidal and Spiral Galaxies
Harlow Shapley
Proc Natl Acad Sci U S A. 1942 May; 28(5): 186–191.
PMCID: PMC1078446
Galactic and Extragalactic Studies: XIV. On the Magnitude Dispersion in the Period-Luminosity Relation
Harlow Shapley, Virginia McKibben, and Richard A. Craig
Proc Natl Acad Sci U S A. 1942 May; 28(5): 192–199.
PMCID: PMC1078447
Galactic and Extragalactic Studies: XV. On the Distribution of Periods for 343 Cepheids in the Small Magellanic Cloud
Harlow Shapley and Virginia McKibben
Proc Natl Acad Sci U S A. 1942 May; 28(5): 200–204.
PMCID: PMC1078448
Chemistry
Radioactive Carbon as an Indicator of Carbon Dioxide Utilization: IX. The Assimilation of Carbon Dioxide by Protozoa
C. B. van Niel, J. O. Thomas, S. Ruben, and M. D. Kamen
Proc Natl Acad Sci U S A. 1942 May; 28(5): 157–161.
PMCID: PMC1078440
Genetics
Close Linkage between Mutations with Similar Effects
L. C. Dunn and Ernst Caspari
Proc Natl Acad Sci U S A. 1942 May; 28(5): 205–210.
PMCID: PMC1078449
The Effect of pH on Inactivation of Tobacco Mosiac Virus by X-Rays
A. Marshak and William N. Takahashi
Proc Natl Acad Sci U S A. 1942 May; 28(5): 211–216.
PMCID: PMC1078450
Mathematics
On Generalized Biorthogonal Expansions in Metric and Unitary Spaces
Y. Y. Tseng
Proc Natl Acad Sci U S A. 1942 May; 28(5): 170–175.
PMCID: PMC1078443
Representation of One-Parameter Semi-Groups of Linear Transformations
Einar Hille
Proc Natl Acad Sci U S A. 1942 May; 28(5): 175–178.
PMCID: PMC1078444
On a Class of Surfaces
G. Fubini
Proc Natl Acad Sci U S A. 1942 May; 28(5): 178–185.
PMCID: PMC1078445
Physics
The Energy Equation for a Viscous Compressible Fluid
H. J. Stewart
Proc Natl Acad Sci U S A. 1942 May; 28(5): 161–164.
PMCID: PMC1078441
Zoölogy
Sensitization of Melanophores by Nerve Cutting
G. H. Parker
Proc Natl Acad Sci U S A. 1942 May; 28(5): 164–170.
PMCID: PMC1078442
Journal Matter
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