PNAS — Table of Contents — May 15, 1940, 26 (5)

May 15, 1940; 26 (5)

Anthropology and Psychology

Astronomy:
- Harlow Shapley,
- Virginia McKibben,
- and Jenka Mohr
Galactic and Extragalactic Studies
Proc Natl Acad Sci U S A 1940 26:326-332
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Astronomy:
- F. Zwicky
Further Remarks on the Cosmological Time Scale
Proc Natl Acad Sci U S A 1940 26:332-333
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Physiology and Biochemistry:
- W. J. Crozier
The Theory of the Visual Threshold
Proc Natl Acad Sci U S A 1940 26:334-339
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Mathematics:
- G. A. Miller
Abelian Groups Which Contain No More Than 25 Proper Subgroups
Proc Natl Acad Sci U S A 1940 26:350-354
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Mathematics:
- J. F. Ritt
On the Intersections of Irreducible Components in the Manifold of a Differential Polynomial
Proc Natl Acad Sci U S A 1940 26:354-356
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Mathematics:
- A. D. Michal
Differentials of Functions with Arguments and Values in Topological Abelian Groups
Proc Natl Acad Sci U S A 1940 26:356-359
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Mathematics:
- Stewart S. Cairns
Triangulated Manifolds Which Are Not Brouwer Manifolds
Proc Natl Acad Sci U S A 1940 26:359-361
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