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Volume 7(5);  May 1921
The cover of the journal
Astronomy
Measurement of the Diameter of Alpha-Orionis by the Interferometer
A. A. Michelson and F. G. Pease
Proc Natl Acad Sci U S A. 1921 May; 7(5): 143–146.
PMCID: PMC1084808
Studies of Magnitudes in Star Clusters: XIII. Variable Stars in N. G. C. 7006
Harlow Shapley and Beatrice W. Mayberry
Proc Natl Acad Sci U S A. 1921 May; 7(5): 152–154.
PMCID: PMC1084811
Genetics
The Influence of Age on Fertility in Swine
Tage Ellinger
Proc Natl Acad Sci U S A. 1921 May; 7(5): 134–138.
PMCID: PMC1084806
Variation and Inheritance in Size in Trypanosoma lewisi: 1. Life-cycle in the Rat and a Study of Size and Variation in “Pure Line” Infections
W. H. Taliaferro
Proc Natl Acad Sci U S A. 1921 May; 7(5): 138–143.
PMCID: PMC1084807
The Globe, a Simple Trisomic Mutant in Datura
Albert F. Blakeslee
Proc Natl Acad Sci U S A. 1921 May; 7(5): 148–152.
PMCID: PMC1084810
Mathematics
An Overlooked Infinite System of Groups of Order pq2
G. A. Miller
Proc Natl Acad Sci U S A. 1921 May; 7(5): 146–148.
PMCID: PMC1084809
Physics
The Diffusion of Air through Water in the Lapse of Years
Carl Barus
Proc Natl Acad Sci U S A. 1921 May; 7(5): 133–134.
PMCID: PMC1084805
Zoölogy
The Skin Temperature of Pachyderms
Francis G. Benedict, Edward L. Fox, and Marion L. Baker
Proc Natl Acad Sci U S A. 1921 May; 7(5): 154–156.
PMCID: PMC1084812
Journal Matter
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