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Volume 6(9);  September 1920
The cover of the journal
Mathematics
A New Proof of a Theorem Due to Schoenflies
J. R. Kline
Proc Natl Acad Sci U S A. 1920 September; 6(9): 529–531.
PMCID: PMC1084608
On the Structure of Finite Continuous Groups with Exceptional Transformations
S. D. Zeldin
Proc Natl Acad Sci U S A. 1920 September; 6(9): 541–543.
PMCID: PMC1084611
Pathology
Are the Superior Cervical Ganlia Indispensable to the Maintenance of Life?
S. J. Meltzer
Proc Natl Acad Sci U S A. 1920 September; 6(9): 532–539.
PMCID: PMC1084609
Physics
Further Measurements of the Effects of Pressure on Resistance
P. W. Bridgman
Proc Natl Acad Sci U S A. 1920 September; 6(9): 505–508.
PMCID: PMC1084604
Characteristic Absorption of X-rays: L. Series
William Duane and R. A. Patterson
Proc Natl Acad Sci U S A. 1920 September; 6(9): 509–518.
PMCID: PMC1084605
On the Relative Positions and Intensities of Lines in X-ray Spectra
William Duane and R. A. Patterson
Proc Natl Acad Sci U S A. 1920 September; 6(9): 518–527.
PMCID: PMC1084606
On a Differential Equation Occurring in Page's Theory of Electromagnetism
H. Bateman
Proc Natl Acad Sci U S A. 1920 September; 6(9): 528–529.
PMCID: PMC1084607
Physiology
Observations on the Body Temperature of Dry Cows
Max Kriss
Proc Natl Acad Sci U S A. 1920 September; 6(9): 539–541.
PMCID: PMC1084610
Journal Matter
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