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Volume 20(9);  September 1934
The cover of the journal
Botany
Application of the Altmann Freezing-Drying Technique to Plant Cytology
T. H. Goodspeed and Fred M. Uber
Proc Natl Acad Sci U S A. 1934 September; 20(9): 495–501.
PMCID: PMC1076465
Chemistry
Reversible Coagulation in Living Tissue: XII
Wilder D. Bancroft and John E. Rutzler, Jr.
Proc Natl Acad Sci U S A. 1934 September; 20(9): 501–509.
PMCID: PMC1076466
Genetics
Genetic Evolutionary Processes
Ernest B. Babcock
Proc Natl Acad Sci U S A. 1934 September; 20(9): 510–515.
PMCID: PMC1076467
Preferential Segregation of the Fourth Chromosomes in Drosophila melanogaster
A. H. Sturtevant
Proc Natl Acad Sci U S A. 1934 September; 20(9): 515–518.
PMCID: PMC1076468
Geology and Paleontology
On the Occurrence of an Oreodont Skeleton in the Sespe of South Mountain, California
Chester Stock
Proc Natl Acad Sci U S A. 1934 September; 20(9): 518–523.
PMCID: PMC1076469
Mathematics
On a Theorem of Carleman
Norman Levinson
Proc Natl Acad Sci U S A. 1934 September; 20(9): 523–525.
PMCID: PMC1076470
Physics
Some Special Cases of the Indeterminacy Principle
F. E. White
Proc Natl Acad Sci U S A. 1934 September; 20(9): 525–529.
PMCID: PMC1076471
Modified Ritz Method
D. H. Weinstein
Proc Natl Acad Sci U S A. 1934 September; 20(9): 529–532.
PMCID: PMC1076472
Psychology and Anthropology
A Discrimination without Previous Conditioning
B. F. Skinner
Proc Natl Acad Sci U S A. 1934 September; 20(9): 532–536.
PMCID: PMC1076473
Zoölogy and Anatomy
Experiments on Early Developing Stages of Fundulus
Jane M. Oppenheimer
Proc Natl Acad Sci U S A. 1934 September; 20(9): 536–538.
PMCID: PMC1076474
Journal Matter
Administrative content — journal masthead, notices, indexes, etc.
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