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Volume 35(4);  April 1949
The cover of the journal
Astronomy
Some Problems of the Evolution of Stars
Otto Struve
Proc Natl Acad Sci U S A. 1949 April; 35(4): 161–167.
PMCID: PMC1062991
Genetics
The Action of Alleic Forms of the Gene A in Maize: II. The Relation of Crossing over to Mutation of A
John R. Laughnan
Proc Natl Acad Sci U S A. 1949 April; 35(4): 167–178.
PMCID: PMC1062992
Aberrant Heterozygotes in Escherichia Coli
Joshua Lederberg
Proc Natl Acad Sci U S A. 1949 April; 35(4): 178–184.
PMCID: PMC1062993
The In Vitro Synthesis of Pantothenic Acid by Pantothenicless and Wild Type Neurospora
Robert P. Wagner
Proc Natl Acad Sci U S A. 1949 April; 35(4): 185–189.
PMCID: PMC1062994
Mathematics
Bounds for the Solutions of a Second-Order Linear Differential Equation
Walter Leighton
Proc Natl Acad Sci U S A. 1949 April; 35(4): 190–191.
PMCID: PMC1062995
Principal Quadratic Functionals and Self-Adjoint Second-Order Differential Equations
Walter Leighton
Proc Natl Acad Sci U S A. 1949 April; 35(4): 192–193.
PMCID: PMC1062996
Pathology
The Mechanism of Proteinuria
T. Addis
Proc Natl Acad Sci U S A. 1949 April; 35(4): 194–198.
PMCID: PMC1062997
Physics
Crystallographic Symmetry in Reciprocal Space
M. J. Buerger
Proc Natl Acad Sci U S A. 1949 April; 35(4): 198–201.
PMCID: PMC1062998
Physical Curves in Space of n Dimensions
Edward Kasner and John De Cicco
Proc Natl Acad Sci U S A. 1949 April; 35(4): 201–204.
PMCID: PMC1062999
On Bending of Curved Thin-Walled Tubes
Eric Reissner
Proc Natl Acad Sci U S A. 1949 April; 35(4): 204–208.
PMCID: PMC1063000
Note on the Theory of Lifting Surfaces
Eric Reissner
Proc Natl Acad Sci U S A. 1949 April; 35(4): 208–215.
PMCID: PMC1063001
Zoology
Responses of the Proximal Retinal Pigment of the Isolated Crustacean Eyestalk to Light and to Darkness
L. H. Kleinholz
Proc Natl Acad Sci U S A. 1949 April; 35(4): 215–218.
PMCID: PMC1063002
The Surface Gel Layer of Fundulus Eggs in Relation to Epiboly
J. P. Trinkaus
Proc Natl Acad Sci U S A. 1949 April; 35(4): 218–225.
PMCID: PMC1063003
Journal Matter
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