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Volume 6(4);  April 1920
The cover of the journal
Botany
The Formation of the Cell Plate in the Cambium of the Higher Plants
Irving W. Bailey
Proc Natl Acad Sci U S A. 1920 April; 6(4): 197–200.
PMCID: PMC1084462
Chemistry
The Influence of Ions on the Osmotic Pressure of Solutions
Jacques Loeb
Proc Natl Acad Sci U S A. 1920 April; 6(4): 211–217.
PMCID: PMC1084465
Genetics
The Evidence for the Linear Order of the Genes
T. H. Morgan, A. H. Sturtevant, and C. B. Bridge
Proc Natl Acad Sci U S A. 1920 April; 6(4): 162–164.
PMCID: PMC1084455
The Arrangement of Genes in Drosophila Virilis
Charles W. Metz
Proc Natl Acad Sci U S A. 1920 April; 6(4): 164–166.
PMCID: PMC1084456
A Contribution of Genetics to the Practical Breeding of Dairy Cattle
Raymond Pearl
Proc Natl Acad Sci U S A. 1920 April; 6(4): 225–233.
PMCID: PMC1084468
Geology
Differentiation by Deformation
N. L. Bowen
Proc Natl Acad Sci U S A. 1920 April; 6(4): 159–162.
PMCID: PMC1084454
Mathematics
The Starting of a Ship
James K. Whittemore
Proc Natl Acad Sci U S A. 1920 April; 6(4): 182–185.
PMCID: PMC1084460
A Thermodynamic Study of Electrolytic Solutions
Frank L. Hitchcock
Proc Natl Acad Sci U S A. 1920 April; 6(4): 186–197.
PMCID: PMC1084461
Functionals Invariant under One-Parameter Continuous Groups of Transformations in the Space of Continuous Functions
I. A. Barnett
Proc Natl Acad Sci U S A. 1920 April; 6(4): 200–204.
PMCID: PMC1084463
Physics
The Functions of Intensity and Phase in the Binaural Location of Pure Tones
G. W. Stewart
Proc Natl Acad Sci U S A. 1920 April; 6(4): 166–169.
PMCID: PMC1084457
The Measurement of Small Time Intervals and Some Applications, Principally Ballistic
L. T. E. Thompson, C. N. Nickman, and N. Riffolt
Proc Natl Acad Sci U S A. 1920 April; 6(4): 169–178.
PMCID: PMC1084458
Charcoal Activation
H. H. Sheldon
Proc Natl Acad Sci U S A. 1920 April; 6(4): 178–182.
PMCID: PMC1084459
Physiology
Thermokinetics of Liometopum Apiculatum Mayr
Harlow Shapley
Proc Natl Acad Sci U S A. 1920 April; 6(4): 204–211.
PMCID: PMC1084464
Psychology
A Study of the Persistence of Vision
Arthur C. Hardy
Proc Natl Acad Sci U S A. 1920 April; 6(4): 221–224.
PMCID: PMC1084467
Zoology
Evidence on the Nature of Nuclear Activity
David H. Tennent
Proc Natl Acad Sci U S A. 1920 April; 6(4): 217–221.
PMCID: PMC1084466
Journal Matter
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