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Volume 7(6);  June 1921
The cover of the journal
Astronomy
The Angular Diameter of Alpha Bootis by the Interferometer
F. G. Pease
Proc Natl Acad Sci U S A. 1921 June; 7(6): 177–179.
PMCID: PMC1084820
Changes Observed in the Crab Nebula in Taurus
John C. Duncan
Proc Natl Acad Sci U S A. 1921 June; 7(6): 179–180.1.
PMCID: PMC1084821
Biology
Note on Moving Equilibra
Alfred J. Lotka
Proc Natl Acad Sci U S A. 1921 June; 7(6): 168–172.
PMCID: PMC1084818
Genetics
Variation and Inheritance in Size in Trypanosoma Lewisi: II. The Effects of Growing “Pure Lines” in Different Vertebrate and Invertebrate Hosts and a Study of Size and Variation in Infections Occurring in Nature
W. H. Taliaferro
Proc Natl Acad Sci U S A. 1921 June; 7(6): 163–168.
PMCID: PMC1084817
Mathematics
A Formula for the Vicosity of Liquids
H. B. Phillips
Proc Natl Acad Sci U S A. 1921 June; 7(6): 172–177.
PMCID: PMC1084819
Physiology
Feeding Experiments with Mixtures of Foodstuffs in Unusual Proportions
Thomas B. Osborne and Lafayette B. Mendel
Proc Natl Acad Sci U S A. 1921 June; 7(6): 157–162.
PMCID: PMC1084816
Journal Matter
Original table of contents page
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