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Volume 21(9);  September 1935
The cover of the journal
Botany
The Assimilation of Ammonium Nitrogen by Nitzchia Closterium and Other Marine Phytoplankton
Claude E. ZoBell
Proc Natl Acad Sci U S A. 1935 September; 21(9): 517–522.
PMCID: PMC1076647
Mathematics
Groups in Which the Squares Generate a Subgroup of Index Less Than Seven
G. A. Miller
Proc Natl Acad Sci U S A. 1935 September; 21(9): 523–525.
PMCID: PMC1076648
“Riemannian” Differential Geometry in Abstract Spaces
A. D. Michal
Proc Natl Acad Sci U S A. 1935 September; 21(9): 526–529.
PMCID: PMC1076649
Asymptotic Representations of Confluent Hypergeometric Functions
E. Fisher
Proc Natl Acad Sci U S A. 1935 September; 21(9): 529–533.
PMCID: PMC1076650
Completely Integrable Differential Equations in Abstract Spaces
A. D. Michal and V. Elconin
Proc Natl Acad Sci U S A. 1935 September; 21(9): 534–536.
PMCID: PMC1076651
An Unbiased Correlation Ratio Measure
Truman L. Kelley
Proc Natl Acad Sci U S A. 1935 September; 21(9): 554–559.
PMCID: PMC1076656
Physics
A Refinement of the Heisenberg Theory of Ferromagnetism, Applicable to Simple Cubic Crystals
Charles H. Fay
Proc Natl Acad Sci U S A. 1935 September; 21(9): 537–542.
PMCID: PMC1076652
Electrical Conductance of Short Gaps in Air
E. Hutchisson, T. H. Osgood, and R. E. Fearon
Proc Natl Acad Sci U S A. 1935 September; 21(9): 542–548.
PMCID: PMC1076653
Zoölogy and Anatomy
The Color Changes in Uca Pugilator
Sven Ph. Carlson
Proc Natl Acad Sci U S A. 1935 September; 21(9): 549–551.
PMCID: PMC1076654
Processes of Localization in Developing Fundulus
Jane M. Oppenheimer
Proc Natl Acad Sci U S A. 1935 September; 21(9): 551–553.
PMCID: PMC1076655
Journal Matter
Administrative content — journal masthead, notices, indexes, etc.
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