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Volume 17(1);  January 1931
The cover of the journal
Chemistry
The Thermal Decomposition of Nitrogen Pentoxide at Low Pressures
J. H. Hodges and E. F. Linhorst
Proc Natl Acad Sci U S A. 1931 January; 17(1): 28–33.
PMCID: PMC1075989
On the Transfer of Energy between Atoms at Collision
Oscar Knefler Rice
Proc Natl Acad Sci U S A. 1931 January; 17(1): 34–39.
PMCID: PMC1075990
Mathematics
Groups Which Admit Five-Eighths Automorphisms
G. A. Miller
Proc Natl Acad Sci U S A. 1931 January; 17(1): 39–43.
PMCID: PMC1075991
Multivectorial Curvature
M. S. Knebelman
Proc Natl Acad Sci U S A. 1931 January; 17(1): 43–47.
PMCID: PMC1075992
On the Unified Field Theory: III
Tracy Yerkes Thomas
Proc Natl Acad Sci U S A. 1931 January; 17(1): 48–58.
PMCID: PMC1075993
Physics
Quantum-Mechanical Motion of Free Electrons in Electromagnetic Fields
E. H. Kennard
Proc Natl Acad Sci U S A. 1931 January; 17(1): 58–62.
PMCID: PMC1075994
Remarks on a Paper: Note on the Nature of Cosmic Rays, by Paul S. Epstein
Carl Störmer
Proc Natl Acad Sci U S A. 1931 January; 17(1): 62–63.
PMCID: PMC1075995
The Production of High Speed Canal Rays without the Use of High Voltages
Ernest O. Lawrence and David H. Sloan
Proc Natl Acad Sci U S A. 1931 January; 17(1): 64–70.
PMCID: PMC1075996
On the Interpretation of Dirac's α-Matrices
G. Breit
Proc Natl Acad Sci U S A. 1931 January; 17(1): 70–73.
PMCID: PMC1075997
Physiology and Pathology
The Penetration of 1-Naphthol-2-Sulphonate Indophenol, o-Chloro Phenol Indophenol and o-Cresol Indophenol into Valonia
Matilda Moldenhauer Brooks
Proc Natl Acad Sci U S A. 1931 January; 17(1): 1–3.
PMCID: PMC1075986
The Work of the Kidney in the Production of Urine
Henry Borsook and Howard M. Winegarden
Proc Natl Acad Sci U S A. 1931 January; 17(1): 3–12.
PMCID: PMC1075987
The Energy Cost of the Excretion of Urine
Henry Borsook and Howard M. Winegarden
Proc Natl Acad Sci U S A. 1931 January; 17(1): 13–28.
PMCID: PMC1075988
Journal Matter
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