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Volume 26(2);  February 15, 1940
Astronomy
Galactic and Extragalactic Studies: V. The Period Frequency of Classical Cepheids in the Magellanic Clouds
Harlow Shapley and Virginia McKibben
Proc Natl Acad Sci U S A. 1940 February 15; 26(2): 105–115.
PMCID: PMC1078014
Remarks on Zwicky's Paper “On the Formation of Clusters of Nebulae and the Cosmological Time Scale”
M. S. Vallarta
Proc Natl Acad Sci U S A. 1940 February 15; 26(2): 116–117.
PMCID: PMC1078015
The Opacity of Extended Stellar Atmospheres
Otto Struve
Proc Natl Acad Sci U S A. 1940 February 15; 26(2): 117–122.
PMCID: PMC1078016
Genetics
A New Inherited Character in Man
A. H. Sturtevant
Proc Natl Acad Sci U S A. 1940 February 15; 26(2): 100–102.
PMCID: PMC1078012
Influence of Female Stock on the Functioning of Small Pollen Male Gametes
W. Ralph Singleton
Proc Natl Acad Sci U S A. 1940 February 15; 26(2): 102–104.
PMCID: PMC1078013
Mathematics
Normal Algebraic Number Fields
Saunders MacLane and O. F. G. Schilling
Proc Natl Acad Sci U S A. 1940 February 15; 26(2): 122–126.
PMCID: PMC1078017
On an Ergodic Analysis of the Remainder Term of Mean Motions
Aurel Wintner
Proc Natl Acad Sci U S A. 1940 February 15; 26(2): 126–129.
PMCID: PMC1078018
Groups Which Contain Less Than Fourteen Proper Subgroups
G. A. Miller
Proc Natl Acad Sci U S A. 1940 February 15; 26(2): 129–132.
PMCID: PMC1078019
On the Decomposition of Transitive Permutation Groups Generated by the Symmetric Group
J. S. Frame
Proc Natl Acad Sci U S A. 1940 February 15; 26(2): 132–139.
PMCID: PMC1078020
General Expansion Theorems
R. P. Boas, Jr.
Proc Natl Acad Sci U S A. 1940 February 15; 26(2): 139–143.
PMCID: PMC1078021
Some Combinatorial Properties of Complexes
Hassler Whitney
Proc Natl Acad Sci U S A. 1940 February 15; 26(2): 143–148.
PMCID: PMC1078022
On the Theory of Sphere-Bundles
Hassler Whitney
Proc Natl Acad Sci U S A. 1940 February 15; 26(2): 148–153.
PMCID: PMC1078023
Zoölogy and Anatomy
On the Synthesis of Cleavage Chromosomes
Theophilus S. Painter
Proc Natl Acad Sci U S A. 1940 February 15; 26(2): 95–100.
PMCID: PMC1078011
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