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Volume 6(6);  June 1920
The cover of the journal
Astronomy
Studies of Magnitudes, in Star Clusters: XI. Frequency of Curves the Absolute Magnitude and Color Index for 1152 Giant Stars
Harlow Shapley
Proc Natl Acad Sci U S A. 1920 June; 6(6): 293–300.
PMCID: PMC1084525
Chemistry
Alkyl Amides of Isothiocyanacetic Acid
Treat B. Johnson, Arthur J. Hill, and Erwin B. Kelsey
Proc Natl Acad Sci U S A. 1920 June; 6(6): 290–293.
PMCID: PMC1084524
Anomalous Osmose
F. E. Bartell
Proc Natl Acad Sci U S A. 1920 June; 6(6): 306–310.
PMCID: PMC1084528
Genetics
The Relative Importance of Heredity and Environment in Determining the Piebald Pattern of Guinea-Pigs
Sewall Wright
Proc Natl Acad Sci U S A. 1920 June; 6(6): 320–332.
PMCID: PMC1084532
Geology
Fossil Plants from the Late Cretaceous of Tennessee
Edward W. Berry
Proc Natl Acad Sci U S A. 1920 June; 6(6): 333–334.
PMCID: PMC1084533
Mathematics
On the Distortion in Conformal Mapping When the Second Coefficient in the Mapping Function Has an Assigned Value
T. H. Gronwall
Proc Natl Acad Sci U S A. 1920 June; 6(6): 300–302.
PMCID: PMC1084526
Conformal Mapping of a Family of Real Conics on Another
T. H. Gronwall
Proc Natl Acad Sci U S A. 1920 June; 6(6): 312–315.
PMCID: PMC1084530
National Research Council
Notes from the Minutes of the Meetings in January and February, 1920, of the Executive Board and Interim Committee of the National Research Council
Proc Natl Acad Sci U S A. 1920 June; 6(6): 335–339.
PMCID: PMC1084534
Report of the Meetings of the International Research Council and of the Affiliated Unions Held at Brussels, July 18-28, 1919
W. W. Campbell
Proc Natl Acad Sci U S A. 1920 June; 6(6): 340–348.
PMCID: PMC1084535
Report on the Organization of the International Astronomical Union
W. W. Campbell and Joel Stebbins
Proc Natl Acad Sci U S A. 1920 June; 6(6): 349–396.
PMCID: PMC1084536
Physics
On the Springfield Rifle and the Leduc Formula
Arthur Gordon Webster
Proc Natl Acad Sci U S A. 1920 June; 6(6): 289.
PMCID: PMC1084523
On the Connection of the Specific Heats with the Equation of State of a Gas
Arthur Gordon Webster
Proc Natl Acad Sci U S A. 1920 June; 6(6): 302–306.
PMCID: PMC1084527
A Photographic Method of Finding the Instantaneous Velocity of Sound Waves at Points Near the Source
Arthur L. Foley
Proc Natl Acad Sci U S A. 1920 June; 6(6): 310–312.
PMCID: PMC1084529
Experiments on the Vibration of Air in Conical Horns
Arthur Gordon Webster
Proc Natl Acad Sci U S A. 1920 June; 6(6): 316–320.
PMCID: PMC1084531
Statistics
On the Rate of Growth of the Population of the United States since 1790 and Its Mathematical Representation
Raymond Pearl and Lowell J. Reed
Proc Natl Acad Sci U S A. 1920 June; 6(6): 275–288.
PMCID: PMC1084522
Journal Matter
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