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Volume 24(12);  December 1938
The cover of the journal
Astronomy
Some Recent Observations of Sunspot Spectra
Harold D. Babcock
Proc Natl Acad Sci U S A. 1938 December; 24(12): 525–527.
PMCID: PMC1077153
Second Note on a Metagalactic Density Gradient
Harlow Shapley
Proc Natl Acad Sci U S A. 1938 December; 24(12): 527–531.
PMCID: PMC1077154
Reflectivity and Color of Meteorites
Fletcher G. Watson
Proc Natl Acad Sci U S A. 1938 December; 24(12): 532–537.
PMCID: PMC1077155
Genetics
The Effects of Chemicals on the Lethal Mutation Rate in Drosophila Melanogaster
L. W. Law
Proc Natl Acad Sci U S A. 1938 December; 24(12): 546–550.
PMCID: PMC1077158
Mathematics
The Consistency of the Axiom of Choice and of the Generalized Continuum-Hypothesis
Kurt Gödel
Proc Natl Acad Sci U S A. 1938 December; 24(12): 556–557.
PMCID: PMC1077160
The Characterization of Pseudo-Sn,r Sets
Leonard M. Blumenthal and George R. Thurman
Proc Natl Acad Sci U S A. 1938 December; 24(12): 557–558.
PMCID: PMC1077161
On Semi-Groups of Selfadjoint Transformations in Hilbert Space
Béla de Sz. Nagy
Proc Natl Acad Sci U S A. 1938 December; 24(12): 559–560.
PMCID: PMC1077162
Groups of Order pm Containing m — α Independent Generators
G. A. Miller
Proc Natl Acad Sci U S A. 1938 December; 24(12): 561–565.
PMCID: PMC1077163
Physiology
On the Duplexity Theory of Visual Response in Vertebrates: II
W. J. Crozier and E. Wolf
Proc Natl Acad Sci U S A. 1938 December; 24(12): 538–541.
PMCID: PMC1077156
Specific Constants for Visual Excitation: III
W. J. Crozier and E. Wolf
Proc Natl Acad Sci U S A. 1938 December; 24(12): 542–545.
PMCID: PMC1077157
Zoölogy
An Internal Secretion Affecting Viability in Crustacea
Frank A. Brown, Jr.
Proc Natl Acad Sci U S A. 1938 December; 24(12): 551–555.
PMCID: PMC1077159
Journal Matter
Original table of contents page
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