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Volume 25(6);  June 1939
The cover of the journal
Chemistry
The Constitution of Secretin
Carl Niemann
Proc Natl Acad Sci U S A. 1939 June; 25(6): 267–269.
PMCID: PMC1077765
Genetics
Mammary Tumor Development in Mice Ovariectomized at Birth
George Woolley, Elizabeth Fekete, and C. C. Little
Proc Natl Acad Sci U S A. 1939 June; 25(6): 277–279.
PMCID: PMC1077768
Observations on the Mechanism of Induced Chromosome Rearrangements in Sciara
C. W. Metz and R. D. Boche
Proc Natl Acad Sci U S A. 1939 June; 25(6): 280–284.
PMCID: PMC1077769
Geology and Paleontology
Eocene Amynodonts from Southern California
Chester Stock
Proc Natl Acad Sci U S A. 1939 June; 25(6): 270–275.
PMCID: PMC1077766
Mathematics
Class Field Theory of Solvable Algebraic Number Fields
D. M. Dribin
Proc Natl Acad Sci U S A. 1939 June; 25(6): 289–290.
PMCID: PMC1077771
On the Representation of Groups of Finite Order
Richard Brauer
Proc Natl Acad Sci U S A. 1939 June; 25(6): 290–295.
PMCID: PMC1077772
Ordered Sets, Complexes and the Problem of Compactification
J. W. Alexander
Proc Natl Acad Sci U S A. 1939 June; 25(6): 296–298.
PMCID: PMC1077773
Physiology and Biochemistry
The Active Uptake of Ions into Cells and Organisms
August Krogh
Proc Natl Acad Sci U S A. 1939 June; 25(6): 275–277.
PMCID: PMC1077767
Zoölogy and Anatomy
Evidence for the Existence of an Electro-Dynamic Field in Living Organisms
H. S. Burr and F. S. C. Northrop
Proc Natl Acad Sci U S A. 1939 June; 25(6): 284–288.
PMCID: PMC1077770
Journal Matter
Administrative content — journal masthead, notices, indexes, etc.
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