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Volume 1(9);  September 1915
The cover of the journal
Agronomy
The Nitrogen Problem in Arid Soils
Chas. B. Lipman
Proc Natl Acad Sci U S A. 1915 September; 1(9): 477–480.
PMCID: PMC1090868
Anthropology
The Indian and Nature
Alice C. Fletcher
Proc Natl Acad Sci U S A. 1915 September; 1(9): 467–473.
PMCID: PMC1090866
Astronomy
A Notation for use in the Discussion of Star Colors
Frederick H. Seares
Proc Natl Acad Sci U S A. 1915 September; 1(9): 481–482.
PMCID: PMC1090869
Distribution of Colors Among the Stars of N. G. C. 1647 and M 67
Frederick H. Seares and Harlow Shapley
Proc Natl Acad Sci U S A. 1915 September; 1(9): 483–487.
PMCID: PMC1090870
Radial Velocities of the Planetary and Irregular Nebulae
W. W. Campbell and J. H. Moore
Proc Natl Acad Sci U S A. 1915 September; 1(9): 496–498.
PMCID: PMC1090873
Physics
On Thiele's `Phase' in Band Spectra
Horace Scudder Uhler
Proc Natl Acad Sci U S A. 1915 September; 1(9): 487–490.
PMCID: PMC1090871
Physiology
The Mechanism of Antagonistic Salt Action
Jacques Loeb
Proc Natl Acad Sci U S A. 1915 September; 1(9): 473–477.
PMCID: PMC1090867
Zoölogy
Why Polar Bodies Do Not Develop
Edwin G. Conklin
Proc Natl Acad Sci U S A. 1915 September; 1(9): 491–496.
PMCID: PMC1090872
Journal Matter
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