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Volume 25(3);  March 1939
The cover of the journal
Astronomy
A Determination of the Distance to the Galactic Center
Harlow Shapley
Proc Natl Acad Sci U S A. 1939 March; 25(3): 113–118.
PMCID: PMC1077724
Supernovae and Stellar Collisions
Fred L. Whipple
Proc Natl Acad Sci U S A. 1939 March; 25(3): 118–125.
PMCID: PMC1077725
Botany
Embryo-Sac Development in Plumbagella
J. W. Boyes
Proc Natl Acad Sci U S A. 1939 March; 25(3): 141–145.
PMCID: PMC1077729
Genetics
On the Subdivision of the Genus Drosophila
A. H. Sturtevant
Proc Natl Acad Sci U S A. 1939 March; 25(3): 137–141.
PMCID: PMC1077728
Mathematics
The Convex Cells Formed by Seven Planes
H. S. White
Proc Natl Acad Sci U S A. 1939 March; 25(3): 147–153.
PMCID: PMC1077731
On the Existence of Minimal Surfaces of General Critical Types
Marston Morse and C. Tompkins
Proc Natl Acad Sci U S A. 1939 March; 25(3): 153–158.
PMCID: PMC1077732
Additive Set Functions on Groups
S. Bochner
Proc Natl Acad Sci U S A. 1939 March; 25(3): 158–160.
PMCID: PMC1077733
Physiology and Biochemistry
The Distribution of Intermedin in the Pars Anterior of the Chicken Pituitary
L. H. Kleinholz and H. Rahn
Proc Natl Acad Sci U S A. 1939 March; 25(3): 145–147.
PMCID: PMC1077730
Psychology and Anthropology
Reliability of Measurements of the Steady Polarity Potential of the Eye
Walter R. Miles
Proc Natl Acad Sci U S A. 1939 March; 25(3): 128–137.
PMCID: PMC1077727
Zoölogy and Anatomy
Observations on Chromosome Elimination in the Germ Cells of Sciara Ocellaris
R. O. Berry
Proc Natl Acad Sci U S A. 1939 March; 25(3): 125–127.
PMCID: PMC1077726
Journal Matter
Administrative content — journal masthead, notices, indexes, etc.
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