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Volume 20(5);  May 1934
The cover of the journal
Astronomy
On Super-Novae
W. Baade and F. Zwicky
Proc Natl Acad Sci U S A. 1934 May; 20(5): 254–259.
PMCID: PMC1076395
Cosmic Rays from Super-Novae
W. Baade and F. Zwicky
Proc Natl Acad Sci U S A. 1934 May; 20(5): 259–263.
PMCID: PMC1076396
The Velocity-Distance Relation for Isolated Extragalactic Nebulae
Edwin Hubble and Milton L. Humason
Proc Natl Acad Sci U S A. 1934 May; 20(5): 264–268.
PMCID: PMC1076397
Botany
Causes of Color Change in Blue-Green Algae
Marston C. Sargent
Proc Natl Acad Sci U S A. 1934 May; 20(5): 251–254.
PMCID: PMC1076394
Genetics
Heat Induced Mutations in Drosophila
H. H. Plough and P. T. Ives
Proc Natl Acad Sci U S A. 1934 May; 20(5): 268–273.
PMCID: PMC1076398
Blood-Group Incompatibility in Rabbit Embryos and in Man
Clyde E. Keeler and W. E. Castle
Proc Natl Acad Sci U S A. 1934 May; 20(5): 273–276.
PMCID: PMC1076399
Linkage Studies of Brachyury (Short Tail) in the House Mouse
Frank H. Clark
Proc Natl Acad Sci U S A. 1934 May; 20(5): 276–279.
PMCID: PMC1076400
Geology and Paleontology
Miocene Patagonia
Edward W. Berry
Proc Natl Acad Sci U S A. 1934 May; 20(5): 280–282.
PMCID: PMC1076401
Mathematics
On Certain Invariants of Closed Extremals
Marston Morse and Everett Pitcher
Proc Natl Acad Sci U S A. 1934 May; 20(5): 282–287.
PMCID: PMC1076402
Confusions in the Use of the Mathematical Term Group
G. A. Miller
Proc Natl Acad Sci U S A. 1934 May; 20(5): 288–291.
PMCID: PMC1076403
Physics
The Strontium II and Barium II Spectra
F. A. Saunders, E. G. Schneider, and Emily Buckingham
Proc Natl Acad Sci U S A. 1934 May; 20(5): 291–296.
PMCID: PMC1076404
Physiology and Biochemistry
The Effect of Intensity and Wave-Length on the Response of Avena to Light
Charles Haig
Proc Natl Acad Sci U S A. 1934 May; 20(5): 296–303.
PMCID: PMC1076405
Temperature Coefficient of Nerve Degeneration
T. W. Torrey
Proc Natl Acad Sci U S A. 1934 May; 20(5): 303–305.
PMCID: PMC1076406
The Prolonged Activity of Momentarily Stimulated Nerves
G. H. Parker
Proc Natl Acad Sci U S A. 1934 May; 20(5): 306–310.
PMCID: PMC1076407
Psychology and Anthropology
The Central Nervous Mechanism for Emotional Responses: II. A Technique for Destroying the Deeper Nuclear Regions within the Cerebrum with a Minimal Destruction of the Intervening Cortex
Clarence W. Brown and Franklin M. Henry
Proc Natl Acad Sci U S A. 1934 May; 20(5): 310–315.
PMCID: PMC1076408
Raiding and Other Outstanding Phenomena in the Behavior of Army Ants
T. C. Schneirla
Proc Natl Acad Sci U S A. 1934 May; 20(5): 316–321.
PMCID: PMC1076409
Journal Matter
Administrative content — journal masthead, notices, indexes, etc.
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