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Volume 7(4);  April 1921
The cover of the journal
Genetics
Current Maps of the Location of the Mutant Genes of Drosophila Melanogaster
Calvin B. Bridges
Proc Natl Acad Sci U S A. 1921 April; 7(4): 127–132.
PMCID: PMC1084768
Mathematics
Quaternions and Their Generalizations
Leonard Eugene Dickson
Proc Natl Acad Sci U S A. 1921 April; 7(4): 109–114.
PMCID: PMC1084762
The Mathematical Theory of the Apportionment of Representatives
Edward V. Huntington
Proc Natl Acad Sci U S A. 1921 April; 7(4): 123–127.
PMCID: PMC1084767
Physics
Note on a Method of Determining the Distribution of Pore Sizes in a Porous Material
Edward W. Washburn
Proc Natl Acad Sci U S A. 1921 April; 7(4): 115–116.
PMCID: PMC1084764
An Apparent Case of Non-Mendelian Inheritance in Datura Due to a Disease
Albert F. Blakeslee
Proc Natl Acad Sci U S A. 1921 April; 7(4): 116–118.
PMCID: PMC1084765
Physiology
The Effect of a Variation in Milling on the Digestibility of Wheat Flours
C. F. Langworthy and Arthur D. Holmes
Proc Natl Acad Sci U S A. 1921 April; 7(4): 119–123.
PMCID: PMC1084766
Zoology
Novocaine as a Substitute for Curare
John F. Fulton, Jr.
Proc Natl Acad Sci U S A. 1921 April; 7(4): 114–115.
PMCID: PMC1084763
Journal Matter
Original table of contents page
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