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Volume 6(8);  August 1920
The cover of the journal
Anthropology
The Influence of Environment upon Development
Franz Boas
Proc Natl Acad Sci U S A. 1920 August; 6(8): 489–493.
PMCID: PMC1084596
Astronomy
Studies of Magnitude in Star Clusters: XII. Summary of a Photometric Investigation of the Globular System Messier 3
Harlow Shapley and Helen N. Davis
Proc Natl Acad Sci U S A. 1920 August; 6(8): 486–489.
PMCID: PMC1084595
Botany
The Genus Botrychium and Its Relationships
D. H. Campbell
Proc Natl Acad Sci U S A. 1920 August; 6(8): 502–503.
PMCID: PMC1084600
Petrology
On Chondrules and Chondritic Structure in Meteorites
George P. Merrill
Proc Natl Acad Sci U S A. 1920 August; 6(8): 449–472.
PMCID: PMC1084590
Physics
The Vertical Interferometer
A. A. Michelson
Proc Natl Acad Sci U S A. 1920 August; 6(8): 473–474.
PMCID: PMC1084591
On the Application of Interference Methods to Astronomical Measurements
A. A. Michelson
Proc Natl Acad Sci U S A. 1920 August; 6(8): 474–475.
PMCID: PMC1084592
A Modification of the Revolving Mirror Method for Measuring the Velocity of Light
A. A. Michelson
Proc Natl Acad Sci U S A. 1920 August; 6(8): 476–477.
PMCID: PMC1084593
On the K Series of X-Rays
William Duane and Wilhelm Stenström
Proc Natl Acad Sci U S A. 1920 August; 6(8): 477–486.
PMCID: PMC1084594
The Possibilities of the Rocket in Weather Forecasting
Robert H. Goddard
Proc Natl Acad Sci U S A. 1920 August; 6(8): 493–495.
PMCID: PMC1084597
Note on a Pneumatic Method of Measuring Variations of the Acceleration of Gravity
Carl Barus
Proc Natl Acad Sci U S A. 1920 August; 6(8): 495–498.
PMCID: PMC1084598
Note on Torsional Measurement of Variations of the Acceleration of Gravity by Interference Methods
Carl Barus
Proc Natl Acad Sci U S A. 1920 August; 6(8): 498–502.
PMCID: PMC1084599
Journal Matter
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