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Volume 7(1);  January 1921
The cover of the journal
Anthropology
Chronology of the San Juan Area
Earl H. Morris
Proc Natl Acad Sci U S A. 1921 January; 7(1): 18–22.
PMCID: PMC1084724
Astronomy
Internal Motion in the Spiral Nebula Messier 33: Preliminary Results
Adriaan van Maanen
Proc Natl Acad Sci U S A. 1921 January; 7(1): 1–5.
PMCID: PMC1084720
Botany
The Vascular Anatomy of Normal and Variant Seedlings of Phaseolus vulgaris
J. Arthur Harris and Edmund W. Sinnott
Proc Natl Acad Sci U S A. 1921 January; 7(1): 35–41.
PMCID: PMC1084727
Chemistry
Experiments on the Electrical Conduction of a Hydrogen Alloy
Donald P. Smith
Proc Natl Acad Sci U S A. 1921 January; 7(1): 28–34.
PMCID: PMC1084726
Geology
Some Geologic Conclusions from Geodetic Data
William Bowie
Proc Natl Acad Sci U S A. 1921 January; 7(1): 23–28.
PMCID: PMC1084725
Physics
The Attachment of Electrons to Neutral Molecules in Air
Leonard B. Loeb
Proc Natl Acad Sci U S A. 1921 January; 7(1): 5–10.
PMCID: PMC1084721
On the Reflection and Re-emission of Electrons from Metal Surfaces: and a Method of Measuring the Ionizing Potential of Such Surfaces
R. A. Millikan and I. G. Barber
Proc Natl Acad Sci U S A. 1921 January; 7(1): 13–18.
PMCID: PMC1084723
Physiology
The Basal Metabolism of Girls 12 to 17 Years of Age
Francis G. Benedict, Mary F. Hendry, and Marion L. Baker
Proc Natl Acad Sci U S A. 1921 January; 7(1): 10–13.
PMCID: PMC1084722
Zoology
The Present Status of the Long-Continued Pedigree Culture of Paramecium Aurelia at Yale University
Lorande Loss Woodruff
Proc Natl Acad Sci U S A. 1921 January; 7(1): 41–44.
PMCID: PMC1084728
Journal Matter
Original table of contents page
Administrative content — journal masthead, notices, indexes, etc.
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