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Volume 18(4);  April 1932
The cover of the journal
Botany
The Penetration of 1-Naphthol-2-Sulphonate Indophenol, o-Chloro Phenol Indophenol and o-Cresol Indophenol into Species of Valonia from the South Seas
Matilda Moldenhauer Brooks
Proc Natl Acad Sci U S A. 1932 April; 18(4): 297–298.
PMCID: PMC1076214
Chemistry
Interatomic Distances in Covalent Molecules and Resonance between Two or More Lewis Electronic Structures
Linus Pauling
Proc Natl Acad Sci U S A. 1932 April; 18(4): 293–297.
PMCID: PMC1076213
Genetics
Studies on Mouse Leukemia: VI. The Predominating Cell Type in Line I
James S. Potter and Maurice N. Richter
Proc Natl Acad Sci U S A. 1932 April; 18(4): 298–303.
PMCID: PMC1076215
Geology and Paleontology
The Miocene Flora of Idaho
Edward W. Berry
Proc Natl Acad Sci U S A. 1932 April; 18(4): 289–292.
PMCID: PMC1076212
Mathematics
Proof of Gibbs' Hypothesis on the Tendency toward Statistical Equilibrium
Eberhard Hopf
Proc Natl Acad Sci U S A. 1932 April; 18(4): 333–340.
PMCID: PMC1076222
Regular Families of Curves: II
Hassler Whitney
Proc Natl Acad Sci U S A. 1932 April; 18(4): 340–342.
PMCID: PMC1076223
Physics
A Critique of Recent Quantum Theories: II
R. J. Seeger
Proc Natl Acad Sci U S A. 1932 April; 18(4): 303–310.
PMCID: PMC1076216
The Ionization of Argon and Neon by Neutral Argon Beams
Otto Beeck
Proc Natl Acad Sci U S A. 1932 April; 18(4): 311–313.
PMCID: PMC1076217
Ionization in Gases by Ions and Atoms
F. Zwicky
Proc Natl Acad Sci U S A. 1932 April; 18(4): 314–318.
PMCID: PMC1076218
The Mass of the Electron
William Duane
Proc Natl Acad Sci U S A. 1932 April; 18(4): 319–322.
PMCID: PMC1076219
An Instrument for the Photometering of the New X-Ray Lines
William Duane
Proc Natl Acad Sci U S A. 1932 April; 18(4): 322–328.
PMCID: PMC1076220
The Pressure Variation of the Heat Function as a Direct Measure of the van der Waals Forces
Frederick G. Keyes and Samuel C. Collins
Proc Natl Acad Sci U S A. 1932 April; 18(4): 328–333.
PMCID: PMC1076221
Journal Matter
Administrative content — journal masthead, notices, indexes, etc.
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