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Volume 34(4);  April 1948
The cover of the journal
Biochemistry
The Protein of the Salivary Gland Secretion in Drosophila
Masuo Kodani
Proc Natl Acad Sci U S A. 1948 April; 34(4): 131–135.
PMCID: PMC1062935
Genetics
Linkage Studies of the Rat: IX. Cataract
W. E. Castle and Helen Dean King
Proc Natl Acad Sci U S A. 1948 April; 34(4): 135–136.
PMCID: PMC1062936
The Suppression of Crossing Over in Inversion Heterozygotes of Drosophila Pseudoobscura
Theodosius Dobzhansky and Carl Epling
Proc Natl Acad Sci U S A. 1948 April; 34(4): 137–141.
PMCID: PMC1062937
The Rôle of Mutation and of Selection in the Frequency of Mutants Among Microörganisms Grown on Irradiated Substrate
Wilson S. Stone, Felix Haas, J. Bennett Clark, and Orville Wyss
Proc Natl Acad Sci U S A. 1948 April; 34(4): 142–149.
PMCID: PMC1062938
Mathematics
On the Average Value of Arithmetic Functions
Richard Bellman
Proc Natl Acad Sci U S A. 1948 April; 34(4): 149–152.
PMCID: PMC1062939
An Inversion and Representation Theory for Convolution Transforms with Totally Positive Kernels
I. I. Hirschman, Jr. and D. V. Widder
Proc Natl Acad Sci U S A. 1948 April; 34(4): 152–156.
PMCID: PMC1062940
The Laplace Transform for Locally Compact Abelian Groups
George W. Mackey
Proc Natl Acad Sci U S A. 1948 April; 34(4): 156–162.
PMCID: PMC1062941
On the Asymptotic Distribution of the Sum of a Random Number of Random Variables
Herbert Robbins
Proc Natl Acad Sci U S A. 1948 April; 34(4): 162–163.
PMCID: PMC1062942
On Variation-Diminishing Integral Operators of the Convolution Type
I. J. Schoenberg
Proc Natl Acad Sci U S A. 1948 April; 34(4): 164–169.
PMCID: PMC1062943
Physics
Physical Curves in Generalized Fields of Force
Edward Kasner and John De Cicco
Proc Natl Acad Sci U S A. 1948 April; 34(4): 169–172.
PMCID: PMC1062944
Journal Matter
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