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Volume 27(9);  September 15, 1941
Astronomy
Galactic and Extragalactic Studies: XII. The Giant Globular Cluster 47 Tucanae and Its Long-Period Variables
Harlow Shapley
Proc Natl Acad Sci U S A. 1941 September 15; 27(9): 440–445.
PMCID: PMC1078358
Botany
The Pyridine Analog of Thiamin and the Growth of Fungi
William J. Robbins
Proc Natl Acad Sci U S A. 1941 September 15; 27(9): 419–422.
PMCID: PMC1078353
Thiazole Effect on Phycomyces
William J. Robbins and Frederick Kavanagh
Proc Natl Acad Sci U S A. 1941 September 15; 27(9): 423–427.
PMCID: PMC1078354
Genetics
The Probable Explanation of Low Transmission Ratios of Certain Monosomic Types of Nicotiana Tabacum
Walter H. Greenleaf
Proc Natl Acad Sci U S A. 1941 September 15; 27(9): 427–430.
PMCID: PMC1078355
Natural and Induced Changes in Chromosome Structure in Maize Endosperm
Donald F. Jones
Proc Natl Acad Sci U S A. 1941 September 15; 27(9): 431–435.
PMCID: PMC1078356
Antithetical Dominance in North American Maize
Edgar Anderson and Ralph O. Erickson
Proc Natl Acad Sci U S A. 1941 September 15; 27(9): 436–440.
PMCID: PMC1078357
Mathematics
Groups Containing a Maximal Proper Subgroup of Order 4
G. A. Miller
Proc Natl Acad Sci U S A. 1941 September 15; 27(9): 445–448.
PMCID: PMC1078359
Topology Based upon the Concept of a Pseudo-Norm
J. P. Lasalle
Proc Natl Acad Sci U S A. 1941 September 15; 27(9): 448–451.
PMCID: PMC1078360
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