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Volume 5(4);  April 1919
The cover of the journal
Agriculture
The Growth Rate of an Annual Plant Helianthus
H. S. Reed and R. H. Holland
Proc Natl Acad Sci U S A. 1919 April; 5(4): 135–144.
PMCID: PMC1091551
Archaeology
The Archaeology of the Southwest: A Preliminary Report
N. C. Nelson
Proc Natl Acad Sci U S A. 1919 April; 5(4): 114–120.
PMCID: PMC1091547
Botany
Bud Variation
A. B. Stout
Proc Natl Acad Sci U S A. 1919 April; 5(4): 130–134.
PMCID: PMC1091550
Chemistry
On Some Metallic Derivatives of Ethyl Thioglycollate
Charles A. Rouiller
Proc Natl Acad Sci U S A. 1919 April; 5(4): 145.
PMCID: PMC1091552
Genetics
Piebald Rats and the Theory of Genes
W. E. Castle
Proc Natl Acad Sci U S A. 1919 April; 5(4): 126–130.
PMCID: PMC1091549
Geology
Falklandia
J. M. Clarke
Proc Natl Acad Sci U S A. 1919 April; 5(4): 102–103.
PMCID: PMC1091543
Mathematics
On the Real Folds of Abelian Varieties
S. Lefschetz
Proc Natl Acad Sci U S A. 1919 April; 5(4): 103–106.
PMCID: PMC1091544
Covariants of Binary Modular Groups
Oliver Edmunds Glenn
Proc Natl Acad Sci U S A. 1919 April; 5(4): 107–110.
PMCID: PMC1091545
The General Solution of the Indeterminate Equation: Ax + By + Cz +... = r
D. N. Lehmer
Proc Natl Acad Sci U S A. 1919 April; 5(4): 111–114.
PMCID: PMC1091546
Physics
An Adjustment in Relation to the Fresnel Coefficient
Carl Barus
Proc Natl Acad Sci U S A. 1919 April; 5(4): 120–125.
PMCID: PMC1091548
Physiology
An Analysis of the Relation Between the Temperature and the Duration of a Biological Process
Selig Hecht
Proc Natl Acad Sci U S A. 1919 April; 5(4): 146–148.
PMCID: PMC1091553
Zoölogy
Restoration of Vitality Through Conjugation
Gary N. Calkins
Proc Natl Acad Sci U S A. 1919 April; 5(4): 95–102.
PMCID: PMC1091542
Journal Matter
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