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Volume 20(2);  February 1934
The cover of the journal
Astronomy
The Diameter of the Andromeda Nebula
Joel Stebbins and Albert E. Whitford
Proc Natl Acad Sci U S A. 1934 February; 20(2): 93–98.
PMCID: PMC1076348
Botany
Haploids in Hordeum Vulgare
Donald A. Johansen
Proc Natl Acad Sci U S A. 1934 February; 20(2): 98–100.
PMCID: PMC1076349
Genetics
Possible Cytoplasmic as Well as Chromosomal Control of Sex in Haploid Males
W. E. Castle
Proc Natl Acad Sci U S A. 1934 February; 20(2): 101–102.
PMCID: PMC1076350
Mutation Rate Increased by Aging Seeds as Shown by Pollen Abortion
J. L. Cartledge and A. F. Blakeslee
Proc Natl Acad Sci U S A. 1934 February; 20(2): 103–110.
PMCID: PMC1076351
Three Cases of Deficiency in Chromosome 9 of Zea mays
Harriet B. Creighton
Proc Natl Acad Sci U S A. 1934 February; 20(2): 111–115.
PMCID: PMC1076352
Mathematics
Minimum Number of Squares in a Group When Not All of Them Are Relatively Commutative
G. A. Miller
Proc Natl Acad Sci U S A. 1934 February; 20(2): 127–130.
PMCID: PMC1076357
General Theorems on Trajectories and Lines of Force
Edward Kasner
Proc Natl Acad Sci U S A. 1934 February; 20(2): 130–136.
PMCID: PMC1076358
On the Metrical Transitivity of the Geodesics on a Surface of Constant Negative Curvature
Gustav A. Hedlund
Proc Natl Acad Sci U S A. 1934 February; 20(2): 136–140.
PMCID: PMC1076359
On the Theory of Laplace Integrals: II
Einar Hille and J. D. Tamarkin
Proc Natl Acad Sci U S A. 1934 February; 20(2): 140–144.
PMCID: PMC1076360
Physics
Notes on Intensities in the Spectrum O II
K. G. Emeleus
Proc Natl Acad Sci U S A. 1934 February; 20(2): 115–117.
PMCID: PMC1076353
On the Vector Model for Almost Closed Shells
M. H. Johnson, Jr.
Proc Natl Acad Sci U S A. 1934 February; 20(2): 117–120.
PMCID: PMC1076354
Physiology and Biochemistry
Can Mammalian Eggs Undergo Normal Development in Vitro?
G. Pincus and E. V. Enzmann
Proc Natl Acad Sci U S A. 1934 February; 20(2): 121–122.
PMCID: PMC1076355
Achromobacter Ichthyodermis, N. Sp., The Etiological Agent of an Infectious Dermatitis of Certain Marine Fishes
Nelson A. Wells and Claude E. ZoBell
Proc Natl Acad Sci U S A. 1934 February; 20(2): 123–126.
PMCID: PMC1076356
Journal Matter
Administrative content — journal masthead, notices, indexes, etc.
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