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Volume 7(9);  September 1921
The cover of the journal
Chemistry
The Effect of Temperature and of the Concentration of Hydrogen Ions upon the Rate of Destruction of Antiscorbutic Vitamin (Vitamin C)
H. C. Sherman, V K. La Mer, and H. L. Campbell
Proc Natl Acad Sci U S A. 1921 September; 7(9): 279–281.
PMCID: PMC1084895
Mathematics
The Average of an Analytic Functional
Norbert Wiener
Proc Natl Acad Sci U S A. 1921 September; 7(9): 253–260.
PMCID: PMC1084890
Semi-covariants of a General System of Linear Homogeneous Differential Equations
E. B. Stouffer
Proc Natl Acad Sci U S A. 1921 September; 7(9): 273–276.
PMCID: PMC1084893
An Algorism for Differential Invariant Theory
Oliver E. Glenn
Proc Natl Acad Sci U S A. 1921 September; 7(9): 276–279.
PMCID: PMC1084894
Physics
On the Calculation of the X-Ray Absorption Frequencies of the Chemical Elements
William Duane
Proc Natl Acad Sci U S A. 1921 September; 7(9): 260–267.
PMCID: PMC1084891
On the Calculation of the X-Ray Absorption Frequencies of the Chemical Elements (Second Note)
William Duane
Proc Natl Acad Sci U S A. 1921 September; 7(9): 267–273.
PMCID: PMC1084892
Journal Matter
Original table of contents page
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