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Volume 37(2);  February 1951
The cover of the journal
Biochemistry
The Mechanism of Rhodopsin Synthesis
Ruth Hubbard and George Wald
Proc Natl Acad Sci U S A. 1951 February; 37(2): 69–79.
PMCID: PMC1063306
Genetics
Polyploidy in Yeast and its Bearing on the Occurrence of Irregular Genetic Ratios
Herschel Roman, Donald C. Hawthorne, and Howard C. Douglas
Proc Natl Acad Sci U S A. 1951 February; 37(2): 79–84.
PMCID: PMC1063307
Mathematics
On the Functional Equations of the Dirichlet Series Derived from Siegel Modular Forms
Richard Bellman
Proc Natl Acad Sci U S A. 1951 February; 37(2): 84–87.
PMCID: PMC1063308
The Structure of Alternative Division Rings
R. H. Bruck and Erwin Kleinfeld
Proc Natl Acad Sci U S A. 1951 February; 37(2): 88–90.
PMCID: PMC1063309
Hausdorff Measure and Lebesgue Area
Herbert Federer
Proc Natl Acad Sci U S A. 1951 February; 37(2): 90–94.
PMCID: PMC1063310
On the Structure of Extremal Polynomials
Michael Fekete
Proc Natl Acad Sci U S A. 1951 February; 37(2): 95–103.
PMCID: PMC1063311
On the Boundary Behavior of Minimal Surfaces
Hans Lewy
Proc Natl Acad Sci U S A. 1951 February; 37(2): 103–110.
PMCID: PMC1063312
The Connectedness of the Orthogonal Group in Hilbert Space
Calvin R. Putnam and Aurel Wintner
Proc Natl Acad Sci U S A. 1951 February; 37(2): 110–112.
PMCID: PMC1063313
A Class of Soluble Diophantine Equations
Morgan Ward
Proc Natl Acad Sci U S A. 1951 February; 37(2): 113–114.
PMCID: PMC1063314
Physics
The Determination of Crystal Structures from X-Ray Data Without a Knowledge of the Phases of the Fourier Coefficients
Dan McLachlan, Jr.
Proc Natl Acad Sci U S A. 1951 February; 37(2): 115–124.
PMCID: PMC1063315
Psychology
Prior Learning as a Factor in Shaping Performance Curves
Don Lewis and Alfred H. Shephard
Proc Natl Acad Sci U S A. 1951 February; 37(2): 124–131.
PMCID: PMC1063316
Journal Matter
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