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Volume 7(12);  December 1921
The cover of the journal
Mathematics
Group of Isomorphisms of a Transitive Substitution Group
G. A. Miller
Proc Natl Acad Sci U S A. 1921 December; 7(12): 325–328.
PMCID: PMC1084915
Einstein Static Fields Admitting a Group G2 of Continuous Transformations into Themselves
L. P. Eisenhart
Proc Natl Acad Sci U S A. 1921 December; 7(12): 328–334.
PMCID: PMC1084916
Geometric Aspects of the Abelian Modular Functions of Genus Four (II)
Arthur B. Coble
Proc Natl Acad Sci U S A. 1921 December; 7(12): 334–338.
PMCID: PMC1084917
Physics
The Growth and Decay of Photo-thermionic Currents from Oxide Coated Filaments
H. D. Arnold and Herbert E. Ives
Proc Natl Acad Sci U S A. 1921 December; 7(12): 323–325.
PMCID: PMC1084914
Journal Matter
Original table of contents page
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