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Volume 17(9);  September 1931
The cover of the journal
Botany
The Chromosomes of Lathyrus Tuberosus
Emma L. Fisk
Proc Natl Acad Sci U S A. 1931 September; 17(9): 511–513.
PMCID: PMC1076103
Genetics
Evidence for Multiple Sex Factors in the X-Chromosome of Drosophila Melanogaster
Th. Dobzhansky and Jack Schultz
Proc Natl Acad Sci U S A. 1931 September; 17(9): 513–518.
PMCID: PMC1076104
Physics
Why Crystals Exist
F. Zwicky
Proc Natl Acad Sci U S A. 1931 September; 17(9): 524–532.
PMCID: PMC1076106
On the Air Resistance of Projectiles
Paul S. Epstein
Proc Natl Acad Sci U S A. 1931 September; 17(9): 532–547.
PMCID: PMC1076107
High Vacuum Pressure Control Apparatus
T. L. Ho
Proc Natl Acad Sci U S A. 1931 September; 17(9): 548–550.
PMCID: PMC1076108
Physiology and Pathology
Body Pattern as Related to Mammary Gland Secretion
John W. Gowen
Proc Natl Acad Sci U S A. 1931 September; 17(9): 518–523.
PMCID: PMC1076105
Journal Matter
Administrative content — journal masthead, notices, indexes, etc.
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