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Volume 26(5);  May 15, 1940
Anthropology and Psychology
Simultaneous Measures of Human Relations and Emotional Activity
Eliot D. Chapple and Charles F. Harding, III
Proc Natl Acad Sci U S A. 1940 May 15; 26(5): 319–326.
PMCID: PMC1078181
Astronomy
Galactic and Extragalactic Studies: VII. Magnitudes of Forty Cepheids in the Large Magellanic Cloud
Harlow Shapley, Virginia McKibben, and Jenka Mohr
Proc Natl Acad Sci U S A. 1940 May 15; 26(5): 326–332.
PMCID: PMC1078182
Further Remarks on the Cosmological Time Scale
F. Zwicky
Proc Natl Acad Sci U S A. 1940 May 15; 26(5): 332–333.
PMCID: PMC1078183
Genetics
Effects of Certain Chemical Treatments on the Morphology of Salivary Gland Chromosomes and Their Interpretation
M. Calvin, M. Kodani, and R. Goldschmidt
Proc Natl Acad Sci U S A. 1940 May 15; 26(5): 340–349.
PMCID: PMC1078185
Mathematics
Abelian Groups Which Contain No More Than 25 Proper Subgroups
G. A. Miller
Proc Natl Acad Sci U S A. 1940 May 15; 26(5): 350–354.
PMCID: PMC1078186
On the Intersections of Irreducible Components in the Manifold of a Differential Polynomial
J. F. Ritt
Proc Natl Acad Sci U S A. 1940 May 15; 26(5): 354–356.
PMCID: PMC1078187
Differentials of Functions with Arguments and Values in Topological Abelian Groups
A. D. Michal
Proc Natl Acad Sci U S A. 1940 May 15; 26(5): 356–359.
PMCID: PMC1078188
Triangulated Manifolds Which Are Not Brouwer Manifolds
Stewart S. Cairns
Proc Natl Acad Sci U S A. 1940 May 15; 26(5): 359–361.
PMCID: PMC1078189
Physiology and Biochemistry
The Theory of the Visual Threshold: II. On the Kinetics of Adaptation
W. J. Crozier
Proc Natl Acad Sci U S A. 1940 May 15; 26(5): 334–339.
PMCID: PMC1078184
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