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Volume 11(12);  December 1925
The cover of the journal
Chemistry
Researches on Thiazoles: X. The Synthesis of Some 2-Phenyl-benzothiazole Arsonic Acids
Marston Taylor Bogert and Hugh Blake Corbitt
Proc Natl Acad Sci U S A. 1925 December; 11(12): 768–772.
PMCID: PMC1086249
The Origin of Terrestrial Helium and Its Association with Other Gases
S. C. Lind
Proc Natl Acad Sci U S A. 1925 December; 11(12): 772–779.
PMCID: PMC1086250
Genetics
The Third Linkage Group in Oenothera
George H. Shull
Proc Natl Acad Sci U S A. 1925 December; 11(12): 715–718.
PMCID: PMC1086236
Fertility of the Rat, Mus Norvegicus
Horace W. Feldman
Proc Natl Acad Sci U S A. 1925 December; 11(12): 718–721.
PMCID: PMC1086237
Mathematics
Invariants of Relative Quadratic Differential Forms
Tracy Yerkes Thomas
Proc Natl Acad Sci U S A. 1925 December; 11(12): 722–725.
PMCID: PMC1086238
A Property Which Characterizes Continuous Curves
R. L. Wilder
Proc Natl Acad Sci U S A. 1925 December; 11(12): 725–728.
PMCID: PMC1086239
Paleontology
The Origin of Species: II. Distinctions between Rectigradations and Allometrons
Henry Fairfield Osborn
Proc Natl Acad Sci U S A. 1925 December; 11(12): 749–752.
PMCID: PMC1086244
Physics
Telephonic Coupling of Acoustic and Electrical Osciliations Evidenced by the Pinhole Probe
Carl Barus
Proc Natl Acad Sci U S A. 1925 December; 11(12): 728–732.
PMCID: PMC1086240
Interpretation of the Hydrogen and Helium Spectra
J. C. Slater
Proc Natl Acad Sci U S A. 1925 December; 11(12): 732–738.
PMCID: PMC1086241
Radiation Emitted by Optically Excited Zinc Vapor
J. G. Winans
Proc Natl Acad Sci U S A. 1925 December; 11(12): 738–742.
PMCID: PMC1086242
On Contact Rectification by Metallic Germanium
Ernest Merritt
Proc Natl Acad Sci U S A. 1925 December; 11(12): 743–748.
PMCID: PMC1086243
Statistics
Vital Statistics of the National Academy of Sciences: I. Age at Election
Raymond Pearl
Proc Natl Acad Sci U S A. 1925 December; 11(12): 752–757.
PMCID: PMC1086245
Vital Statistics of the National Academy of Sciences: II. Elections of Young Men
Raymond Pearl
Proc Natl Acad Sci U S A. 1925 December; 11(12): 757–760.
PMCID: PMC1086246
Vital Statistics of the National Academy of Sciences: III. Mortality
Raymond Pearl
Proc Natl Acad Sci U S A. 1925 December; 11(12): 760–765.
PMCID: PMC1086247
Vital Statistics of the National Academy of Sciences: IV. The Present Limitation to Total Membership and Other Matters
Raymond Pearl
Proc Natl Acad Sci U S A. 1925 December; 11(12): 765–768.
PMCID: PMC1086248
Journal Matter
Original table of contents page
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