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Volume 28(12);  December 1942
The cover of the journal
Bacteriology
Oxidized Cotton, an Immunologically Specific Polysaccharide
Michael Heidelberger and Gladys L. Hobby
Proc Natl Acad Sci U S A. 1942 December; 28(12): 516–518.
PMCID: PMC1078530
Botany
Sexual Hormones in Achlya: V. Hormone A′, a Male-Secreted Augmenter or Activator of Hormone A
John R. Raper
Proc Natl Acad Sci U S A. 1942 December; 28(12): 509–516.
PMCID: PMC1078529
Chemistry
The Lower Hydrates of Soap
M. J. Buerger, L. B. Smith, A. de Bretteville, Jr., and F. V. Ryer
Proc Natl Acad Sci U S A. 1942 December; 28(12): 526–529.
PMCID: PMC1078532
The Characteristics of Soap Hemihydrate Crystals
M. J. Buerger
Proc Natl Acad Sci U S A. 1942 December; 28(12): 529–535.
PMCID: PMC1078533
Genetics
The Genetic Nature of X-Ray Induced Changes in Pollen
Charles M. Rick
Proc Natl Acad Sci U S A. 1942 December; 28(12): 518–525.
PMCID: PMC1078531
Mathematics
Statistical Metrics
Karl Menger
Proc Natl Acad Sci U S A. 1942 December; 28(12): 535–537.
PMCID: PMC1078534
Natural Isomorphisms in Group Theory
Samuel Eilenberg and Saunders MacLane
Proc Natl Acad Sci U S A. 1942 December; 28(12): 537–543.
PMCID: PMC1078535
Concerning Intersecting Continua
R. L. Moore
Proc Natl Acad Sci U S A. 1942 December; 28(12): 544–550.
PMCID: PMC1078536
Concerning a Continuum and Its Boundary
R. L. Moore
Proc Natl Acad Sci U S A. 1942 December; 28(12): 550–555.
PMCID: PMC1078537
Concerning Domains Whose Boundaries Are Compact
R. L. Moore
Proc Natl Acad Sci U S A. 1942 December; 28(12): 555–561.
PMCID: PMC1078538
On Sets of Integers Which Contain No Three Terms in Arithmetical Progression
R. Salem and D. C. Spencer
Proc Natl Acad Sci U S A. 1942 December; 28(12): 561–563.
PMCID: PMC1078539
Some Advances in the Combinatory Theory of Quantification
Haskell B. Curry
Proc Natl Acad Sci U S A. 1942 December; 28(12): 564–569.
PMCID: PMC1078540
Journal Matter
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