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Volume 4(2);  February 1918
The cover of the journal
Agriculture
Disease Resistance In Cabbage
L. R. Jones
Proc Natl Acad Sci U S A. 1918 February; 4(2): 42–46.
PMCID: PMC1091389
Article
Notice of Biographical Memoirs
Proc Natl Acad Sci U S A. 1918 February; 4(2): 54.
PMCID: PMC1091393
Astronomy
A Determination of the Solar Motion and the Stream Motion Based on Radial Velocities and Absolute Magnitudes
Gustaf Strömberg
Proc Natl Acad Sci U S A. 1918 February; 4(2): 36–41.
PMCID: PMC1091388
Chemistry
The Heat Capacity of Electro Positive Metals and the Thermal Energy of Free Electrons
Gilbert N. Lewis, E. D. Eastman, and W. H. Rodebush
Proc Natl Acad Sci U S A. 1918 February; 4(2): 25–29.
PMCID: PMC1091386
National Research Council
Report of the Committee on Anthropology
W. H. Holmes and Ales Hrdlicka
Proc Natl Acad Sci U S A. 1918 February; 4(2): 52–54.
PMCID: PMC1091392
Physics
Thermo-Electric Diagrams on the P-V-Plane
Edwin H. Hall
Proc Natl Acad Sci U S A. 1918 February; 4(2): 29–35.
PMCID: PMC1091387
Is a Moving Star Retarded by the Reaction of Its Own Radiation?
Leigh Page
Proc Natl Acad Sci U S A. 1918 February; 4(2): 47–49.
PMCID: PMC1091390
On Electromagnetic Induction and Relative Motion: II
S. J. Barnett
Proc Natl Acad Sci U S A. 1918 February; 4(2): 49–51.
PMCID: PMC1091391
Journal Matter
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