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Volume 17(3);  March 1931
The cover of the journal
Engineering
The Convention of Equidimensional Electric and Magnetic Units
Arthur E. Kennelly
Proc Natl Acad Sci U S A. 1931 March; 17(3): 147–153.
PMCID: PMC1076017
Mathematics
On the Groups of Orientable Two-Manifolds
Tsai-Han Kiang
Proc Natl Acad Sci U S A. 1931 March; 17(3): 142–144.
PMCID: PMC1076015
Inverse Commutator Subgroups
G. A. Miller
Proc Natl Acad Sci U S A. 1931 March; 17(3): 144–147.
PMCID: PMC1076016
Physics
On Thermodynamic Equilibrium in a Static Einstein Universe
Richard C. Tolman
Proc Natl Acad Sci U S A. 1931 March; 17(3): 153–160.
PMCID: PMC1076018
Answer to Prof. Störmer's Remark
Paul S. Epstein
Proc Natl Acad Sci U S A. 1931 March; 17(3): 160–161.
PMCID: PMC1076019
Zoölogy
Reactions of Dermal Melanophores in Necturus to Heat and to Cold
Elsie H. Field
Proc Natl Acad Sci U S A. 1931 March; 17(3): 137–140.
PMCID: PMC1076013
Histological Polarization of Lateral Giant-Fibres in the Crayfish
Stanley G. Warner
Proc Natl Acad Sci U S A. 1931 March; 17(3): 140–141.
PMCID: PMC1076014
Journal Matter
Administrative content — journal masthead, notices, indexes, etc.
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