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Volume 27(1);  January 15, 1941
Botany
The Twelfth Primary Trisomic Type in Nicotiana Sylvestris
T. H. Goodspeed and P. Avery
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 13–14.
PMCID: PMC1078264
Chemistry
Purine and Pyrimidine as Growth Substances for Lactic Acid Bacteria
Esmond E. Snell and Herschel K. Mitchell
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 1–7.
PMCID: PMC1078262
Genetics
The Time Interval between X-Radiation of Sperm of Drosophila and Chromosome Recombination
B. P. Kaufmann
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 18–24.
PMCID: PMC1078266
Mechanism of the Origin of X-Ray Induced Notch Deficiencies in Drosophila Melanogaster
M. Demerec and U. Fano
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 24–31.
PMCID: PMC1078267
Another Case of Unequal Crossing-Over in Drosophila Melanogaster
E. B. Lewis
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 31–35.
PMCID: PMC1078268
Position of Adult Testes in Drosophila Melanogaster Meigen
Albert Miller
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 35–41.
PMCID: PMC1078269
An Analysis of X-Ray Induced Single Breaks in Neuroblast Chromosomes of the Grasshopper (Chortophaga Viridifasciata)
J. Gordon Carlson
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 42–47.
PMCID: PMC1078270
Discovery of a Predicted Gene Arrangement in Drosophila Azteca
Th. Dobzhansky
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 47–50.
PMCID: PMC1078271
Mathematics
Critical Points and Unstable Minimal Surfaces
Richard Courant
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 51–57.
PMCID: PMC1078272
A Note on Conformal Geometry
N. Coburn
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 57–60.
PMCID: PMC1078273
Homotopy Relations in Fibre Spaces
W. Hurewicz and N. E. Steenrod
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 60–64.
PMCID: PMC1078274
Note on Linear Difference and Differential Equations
George D. Birkhoff
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 65–67.
PMCID: PMC1078275
Maximal Subgroups of a Given Group
G. A. Miller
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 68–71.
PMCID: PMC1078276
A Unified Theory of Integration
H. M. MacNeille
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 71–76.
PMCID: PMC1078277
On Improperly Irregular Cyclotomic Fields
H. S. Vandiver
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 77–83.
PMCID: PMC1078278
A General Theory of Spectra: II
M. H. Stone
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 83–87.
PMCID: PMC1078279
General Invariants of Irregular Analytic Elements
Edward Kasner and John De Cicco
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 88–92.
PMCID: PMC1078280
Pathology and Bacteriology
Contact and Measles
Edwin B. Wilson and Jane Worcester
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 7–13.
PMCID: PMC1078263
Zoölogy and Anatomy
Isolating Mechanisms in Tree Frogs
Albert P. Blair
Proc Natl Acad Sci U S A. 1941 January 15; 27(1): 14–17.
PMCID: PMC1078265
Journal Matter
Original table of contents page
Administrative content — journal masthead, notices, indexes, etc.
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