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Volume 6(2);  February 1920
The cover of the journal
Anthropology
Central American Calendars and the Gregorian Day
Herbert J. Spinden
Proc Natl Acad Sci U S A. 1920 February; 6(2): 56–59.
PMCID: PMC1084405
Astronomy
The Larger Opportunities for Research on the Relations of Solar and Terrestrial Radiation
C. G. Abbot
Proc Natl Acad Sci U S A. 1920 February; 6(2): 82–95.
PMCID: PMC1084415
Chemistry
An Apparent High Pressure Due to Adsorption, the Heat of Adsorption, and the Density of Gas-Mask Charcoals
William D. Harkins and D. T. Ewing
Proc Natl Acad Sci U S A. 1920 February; 6(2): 49–56.
PMCID: PMC1084404
Genetics
Selective Fertilization in Pollen Mixtures
D. F. Jones
Proc Natl Acad Sci U S A. 1920 February; 6(2): 66–70.
PMCID: PMC1084410
Model of the Linkage System of Eleven Second Chromosomegenes of Drosophila
W. E. Castle
Proc Natl Acad Sci U S A. 1920 February; 6(2): 73–77.
PMCID: PMC1084412
Mathematics
Groups Generated by Two Operators, s1, s2, Which Satisfy the Conditions s1m = s2n, (s1s2)k = I, s1s2 = s2s1
G. A. Miller
Proc Natl Acad Sci U S A. 1920 February; 6(2): 70–73.
PMCID: PMC1084411
Pathology
Calcium and Magnesium Metabolism in Certain Diseases
Frank P. Underhill, James A. Honeij, and L. Jean Bogert
Proc Natl Acad Sci U S A. 1920 February; 6(2): 79–81.
PMCID: PMC1084414
Physics
The Torsional Magnetic Energy Absorption of an Iron Conductor
Carl Barus
Proc Natl Acad Sci U S A. 1920 February; 6(2): 59–61.
PMCID: PMC1084406
A Study of Absorption Spectra with the Electric Furnace
Arthur S. King
Proc Natl Acad Sci U S A. 1920 February; 6(2): 63–65.
PMCID: PMC1084408
A Study of the Effect of a Magnetic Field on Electric Furnace Spectra
Arthur S. King
Proc Natl Acad Sci U S A. 1920 February; 6(2): 65–66.
PMCID: PMC1084409
Physiology
The Adjustment to the Barometer of the Hematorespiratory Functions in Man
Yandell Henderson
Proc Natl Acad Sci U S A. 1920 February; 6(2): 62–63.
PMCID: PMC1084407
Zoölogy
The Development of Connective Tissue in the Amphibian Embryo
George A. Baitsell
Proc Natl Acad Sci U S A. 1920 February; 6(2): 77–79.
PMCID: PMC1084413
On the Hyperplasia of Nerve Centers Resulting from Excessive Peripheral Loading
S. R. Detwiler
Proc Natl Acad Sci U S A. 1920 February; 6(2): 96–101.
PMCID: PMC1084416
Journal Matter
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