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Volume 9(12);  December 1923
The cover of the journal
Genetics
Control of the Appearance of Pupa-Larvae in Paedogenetic Diptera
Reginald G. Harris
Proc Natl Acad Sci U S A. 1923 December; 9(12): 407–413.
PMCID: PMC1085471
Mathematics
Note on an Experimental Problem of the Late A. G. Webster
F. L. Hitchcock
Proc Natl Acad Sci U S A. 1923 December; 9(12): 399–401.
PMCID: PMC1085467
A New Kind of Representation of Surfaces
G. Y. Rainich
Proc Natl Acad Sci U S A. 1923 December; 9(12): 401–403.
PMCID: PMC1085468
The Electromagnetic Field and Curvature
G. Y. Rainich
Proc Natl Acad Sci U S A. 1923 December; 9(12): 404–406.
PMCID: PMC1085469
On the Deformation of an n Cell
J. W. Alexander
Proc Natl Acad Sci U S A. 1923 December; 9(12): 406–407.
PMCID: PMC1085470
Pathology
The Absolute Weight of the Heart and the Spleen
Raymond Pearl and Agnes Latimer Bacon
Proc Natl Acad Sci U S A. 1923 December; 9(12): 428–433.
PMCID: PMC1085475
The Nature of Resistance to Seedling Blight of Cereals
James G. Dickson, Sophia H. Eckerson, and Karl P. Link
Proc Natl Acad Sci U S A. 1923 December; 9(12): 434–439.
PMCID: PMC1085476
Physics
The Wave-Lengths of Secondary X-Rays
George L. Clark and William Duane
Proc Natl Acad Sci U S A. 1923 December; 9(12): 413–418.
PMCID: PMC1085472
The Wave-Lengths of Secondary X-Rays (Second note)
George L. Clark and William Duane
Proc Natl Acad Sci U S A. 1923 December; 9(12): 419–424.
PMCID: PMC1085473
Zoölogy
Symbiosis between Termites and Their Intestinal Protozoa
L. R. Cleveland
Proc Natl Acad Sci U S A. 1923 December; 9(12): 424–428.
PMCID: PMC1085474
Journal Matter
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