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Volume 34(2);  February 1948
The cover of the journal
Astronomy
Some Remarks on the Weights of Unknowns as Determined by the Method of Differential Corrections
S. L. Piotrowski
Proc Natl Acad Sci U S A. 1948 February; 34(2): 23–26.
PMCID: PMC1062908
Galactic and Extragalactic Studies: XVIII. The Pulse Index for Eighty-Nine Variable Stars in the Magellanic Clouds
Harlow Shapley
Proc Natl Acad Sci U S A. 1948 February; 34(2): 27–32.
PMCID: PMC1062909
Biochemistry
The p-Aminobenzoic Acid Requirement of the “Sulfonamide-Requiring” Mutant Strain of Neurospora
Marko Zalokar
Proc Natl Acad Sci U S A. 1948 February; 34(2): 32–36.
PMCID: PMC1062910
Genetics
Directed Fertilization in Maize
Herschel Roman
Proc Natl Acad Sci U S A. 1948 February; 34(2): 36–42.
PMCID: PMC1062911
Mathematics
Abstract Ergodic Theorems
W. F. Eberlein
Proc Natl Acad Sci U S A. 1948 February; 34(2): 43–47.
PMCID: PMC1062912
Closed Surfaces Without Conjugate Points
Eberhard Hopf
Proc Natl Acad Sci U S A. 1948 February; 34(2): 47–51.
PMCID: PMC1062913
The Completeness of the Irreducible Unitary Representations of a Locally Compact Group
F. I. Mautner
Proc Natl Acad Sci U S A. 1948 February; 34(2): 52–54.
PMCID: PMC1062914
On Lacunary Trigonometric Series, II
R. Salem and A. Zygmund
Proc Natl Acad Sci U S A. 1948 February; 34(2): 54–62.
PMCID: PMC1062915
Applications of Cyclotomy to the Theory of Non-Homogeneous Equations in a Finite Field
H. S. Vandiver
Proc Natl Acad Sci U S A. 1948 February; 34(2): 62–66.
PMCID: PMC1062916
Physics
A Special Class of Solutions of the Equations of the Gravitational Field Arising from Certain Gauge-Invariant Action Principles
H. A. Buchdahl
Proc Natl Acad Sci U S A. 1948 February; 34(2): 66–68.
PMCID: PMC1062917
Physical Families of Curves in Space
Edward Kasner and John De Cicco
Proc Natl Acad Sci U S A. 1948 February; 34(2): 68–72.
PMCID: PMC1062918
Physiology
A Physiological Basis for Some Suppressor Mutations and Possibly for One Gene Heterosis
Sterling Emerson
Proc Natl Acad Sci U S A. 1948 February; 34(2): 72–74.
PMCID: PMC1062919
Journal Matter
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