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Volume 24(9);  September 1938
The cover of the journal
Biophysics
The Mechanism of Delayed Killing of Maize Seeds with X-Radiation
Louis R. Maxwell
Proc Natl Acad Sci U S A. 1938 September; 24(9): 377–384.
PMCID: PMC1077119
Botany
Contact Effects between Plant Roots and Soil Colloids
H. Jenny and R. Overstreet
Proc Natl Acad Sci U S A. 1938 September; 24(9): 384–392.
PMCID: PMC1077120
Genetics
Facet Number and the v+ Hormone in the Bar Eye of Drosophila Melanogaster
Simon Chevais, Boris Ephrussi, and Arthur G. Steinberg
Proc Natl Acad Sci U S A. 1938 September; 24(9): 365–368.
PMCID: PMC1077116
An X-Ray Induced Intercalary Duplication in Drosophila Involving Union of Sister Chromatids
B. P. Kaufmann and Ruth C. Bate
Proc Natl Acad Sci U S A. 1938 September; 24(9): 368–371.
PMCID: PMC1077117
The Distribution of Gene Frequencies in Populations of Polyploids
Sewall Wright
Proc Natl Acad Sci U S A. 1938 September; 24(9): 372–377.
PMCID: PMC1077118
Mathematics
On Locally Connected Sets and Retracts
S. Lefschetz
Proc Natl Acad Sci U S A. 1938 September; 24(9): 392–393.
PMCID: PMC1077121
Conformal Geometry of Horn Angles of Second Order
Edward Kasner and John de Cicco
Proc Natl Acad Sci U S A. 1938 September; 24(9): 393–400.
PMCID: PMC1077122
Statistics
A Skeleton Life Table
Carl R. Doering and Alice L. Forbes
Proc Natl Acad Sci U S A. 1938 September; 24(9): 400–405.
PMCID: PMC1077123
Journal Matter
Original table of contents page
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