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Volume 6(5);  May 1920
The cover of the journal
Chemistry
The Relation Between the Iso-Electric Point of a Globulin and Its Solubility and Acid Combining Capacity in Salt Solution
Edwin J. Cohn
Proc Natl Acad Sci U S A. 1920 May; 6(5): 256–263.
PMCID: PMC1084499
Genetics
Calculating Ancestral Influence in Man: A Mathematical Measure of the Demonstrated Facts of Bi-Sexual Heredity
Harry H. Laughlin
Proc Natl Acad Sci U S A. 1920 May; 6(5): 235–242.
PMCID: PMC1084494
A Note on the Human Sex Ratio
C. C. Little
Proc Natl Acad Sci U S A. 1920 May; 6(5): 250–253.
PMCID: PMC1084497
Geology
A General Sinking of Sea-Level in Recent Time
Reginald A. Daly
Proc Natl Acad Sci U S A. 1920 May; 6(5): 246–250.
PMCID: PMC1084496
Mathematics
On Kummer's Memoir of 1857 Concerning Fermat's Last Theorem
H. S. Vandiver
Proc Natl Acad Sci U S A. 1920 May; 6(5): 266–269.
PMCID: PMC1084501
Physics
The Existence of Homogeneous Groups of Large Ions
Oswald Blackwood
Proc Natl Acad Sci U S A. 1920 May; 6(5): 253–256.
PMCID: PMC1084498
An Improved Form of High Tension D. C. Apparatus
David L. Webster
Proc Natl Acad Sci U S A. 1920 May; 6(5): 269–272.
PMCID: PMC1084502
Physiology
The Effect of Anesthetics on Living Cells
Grace Medes and J. F. McClendon
Proc Natl Acad Sci U S A. 1920 May; 6(5): 243–246.
PMCID: PMC1084495
The Carbon Dioxide: Heat Ratio in Cattle
Henry Prentiss Armsby, J. August Fries, and Winfred Waite Braman
Proc Natl Acad Sci U S A. 1920 May; 6(5): 263–265.
PMCID: PMC1084500
Zoölogy
The Effect of the Concentration of Nitrates on the Reducing Powers of Bacteria
R. W. Glaser
Proc Natl Acad Sci U S A. 1920 May; 6(5): 272–274.
PMCID: PMC1084503
Journal Matter
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