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Volume 25(5);  May 1939
The cover of the journal
Astronomy
Influences of Limiting Magnitude upon Meteor Frequency
Fletcher Watson
Proc Natl Acad Sci U S A. 1939 May; 25(5): 243–245.
PMCID: PMC1077757
Botany
Cell Polarity and the Differentiation of Root Hairs
Edmund W. Sinnott and Robert Bloch
Proc Natl Acad Sci U S A. 1939 May; 25(5): 248–252.
PMCID: PMC1077759
Genetics
The Time Factor in X-Ray Production of Chromosome Aberrations
Karl Sax
Proc Natl Acad Sci U S A. 1939 May; 25(5): 225–233.
PMCID: PMC1077754
Induction of Triploidy and Haploidy in the Newt, Triturus Viridescens, by Cold Treatment of Unsegmented Eggs
Gerhard Fankhauser and Raymond B. Griffiths
Proc Natl Acad Sci U S A. 1939 May; 25(5): 233–238.
PMCID: PMC1077755
The Rôle of Developmental Rates in the Production of Notched Wing Characters in Drosophila Melanogaster
Werner Braun
Proc Natl Acad Sci U S A. 1939 May; 25(5): 238–242.
PMCID: PMC1077756
Mathematics
On Molecular and p-Adic Representations of Algebras
Richard Brauer
Proc Natl Acad Sci U S A. 1939 May; 25(5): 252–258.
PMCID: PMC1077760
Number of the Subgroups of Any Abelian Group
G. A. Miller
Proc Natl Acad Sci U S A. 1939 May; 25(5): 258–262.
PMCID: PMC1077761
The Transformation of a Lagrangian Series into a Newtonian Series
H. Bateman
Proc Natl Acad Sci U S A. 1939 May; 25(5): 262–265.
PMCID: PMC1077762
Physiology and Biochemistry
Is Auxin Produced in Roots?
J. van Overbeek
Proc Natl Acad Sci U S A. 1939 May; 25(5): 245–248.
PMCID: PMC1077758
Journal Matter
Administrative content — journal masthead, notices, indexes, etc.
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