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Volume 7(2);  February 1921
The cover of the journal
Chemistry
The Correlation of Compound Formation, Ionization and Solubility in Solutions: Outline of a Modified Ionization Theory
James Kendall
Proc Natl Acad Sci U S A. 1921 February; 7(2): 56–62.
PMCID: PMC1084745
Genetics
A Preliminary Note on the Results of Crossing Certain Varieties of Nicotiana Tabacum
William Albert Setchell, Thomas Harper Goodspeed, and Roy Elwood Clausen
Proc Natl Acad Sci U S A. 1921 February; 7(2): 50–56.
PMCID: PMC1084744
Mathematics
On the Roots of Bessel's Functions
J. H. McDonald
Proc Natl Acad Sci U S A. 1921 February; 7(2): 66–68.
PMCID: PMC1084747
Physics
Positive Ray Analysis of Magnesium
Arthur J. Dempster
Proc Natl Acad Sci U S A. 1921 February; 7(2): 45–47.
PMCID: PMC1084742
The Energy Content of the Diapason
Carl Barus
Proc Natl Acad Sci U S A. 1921 February; 7(2): 47–50.
PMCID: PMC1084743
The Pelter Effect
Edwin H. Hall
Proc Natl Acad Sci U S A. 1921 February; 7(2): 62–66.
PMCID: PMC1084746
Journal Matter
Original table of contents page
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