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Volume 25(4);  April 1939
The cover of the journal
Botany
Leaf Growth Factors II—The Activity of Pure Substances in Leaf Growth
David M. Bonner and A. J. Haagen-Smit
Proc Natl Acad Sci U S A. 1939 April; 25(4): 184–188.
PMCID: PMC1077741
Genetics
The Occurrence of Parthenogenetic Diploids in Tetraploid Maize
L. F. Randolph and Harold E. Fischer
Proc Natl Acad Sci U S A. 1939 April; 25(4): 161–164.
PMCID: PMC1077736
Mathematics
An Ergodic Theorem for n-Parameter Groups
Nelson Dunford
Proc Natl Acad Sci U S A. 1939 April; 25(4): 195–196.
PMCID: PMC1077743
On Analogues of the Bernoulli and Allied Numbers
H. S. Vandiver
Proc Natl Acad Sci U S A. 1939 April; 25(4): 197–201.
PMCID: PMC1077744
General Self-Adjoint Boundary Conditions for Certain Partial Differential Operators
J. W. Calkin
Proc Natl Acad Sci U S A. 1939 April; 25(4): 201–206.
PMCID: PMC1077745
On the Gaussian Law of Errors in the Theory of Additive Functions
P. Erdös and M. Kac
Proc Natl Acad Sci U S A. 1939 April; 25(4): 206–207.
PMCID: PMC1077746
On the Connectivity Ring of a Lattice
J. W. Alexander
Proc Natl Acad Sci U S A. 1939 April; 25(4): 208–209.
PMCID: PMC1077747
Characterization of the Moebius Group of Circular Transformations
Edward Kasner and John De Cicco
Proc Natl Acad Sci U S A. 1939 April; 25(4): 209–213.
PMCID: PMC1077748
On the Intersections of Algebraic Differential Manifolds
J. F. Ritt
Proc Natl Acad Sci U S A. 1939 April; 25(4): 214–215.
PMCID: PMC1077749
The Plateau Problem for Non-Relative Minima
Max Shiffman
Proc Natl Acad Sci U S A. 1939 April; 25(4): 215–220.
PMCID: PMC1077750
Consistency-Proof for the Generalized Continuum-Hypothesis
Kurt Gödel
Proc Natl Acad Sci U S A. 1939 April; 25(4): 220–224.
PMCID: PMC1077751
Physiology and Biochemistry
The Synthesis and Destruction of Vitamin B1 by Phycomyces
James Bonner and Edwin R. Buchman
Proc Natl Acad Sci U S A. 1939 April; 25(4): 164–171.
PMCID: PMC1077737
Temperature and the Critical Intensity for Response to Visual-Flicker: III. On the Theory of the Visual Response Contour, and the Nature of Visual Duplexity
W. J. Crozier and E. Wolf
Proc Natl Acad Sci U S A. 1939 April; 25(4): 171–175.
PMCID: PMC1077738
Specific Constants for Visual Excitation: IV. On the Nature of Genetic Differences
W. J. Crozier and E. Wolf
Proc Natl Acad Sci U S A. 1939 April; 25(4): 176–179.
PMCID: PMC1077739
Psychology and Anthropology
A Note on Polarity Potentials from the Human Eye
Donald B. Lindsley and Walter S. Hunter
Proc Natl Acad Sci U S A. 1939 April; 25(4): 180–183.
PMCID: PMC1077740
Zoölogy and Anatomy
Centrioles and Chromosomes in the Atypical Spermatogenesis of Vivipara
Arthur Wagg Pollister
Proc Natl Acad Sci U S A. 1939 April; 25(4): 189–195.
PMCID: PMC1077742
Journal Matter
Administrative content — journal masthead, notices, indexes, etc.
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