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Volume 9(9);  September 1923
The cover of the journal
Astronomy
The Asymmetry in the Distribution of Stellar Velocities
Gustaf Strömberg
Proc Natl Acad Sci U S A. 1923 September; 9(9): 312–317.
PMCID: PMC1085410
On the Mean Absolute Magnitudes of the K and M Giants and the Systematic Errors in Trigonometric Parallaxes
Willem J. Luyten
Proc Natl Acad Sci U S A. 1923 September; 9(9): 317–323.
PMCID: PMC1085411
Chemistry
A Theory of Color Production: I
Julius Stieglitz
Proc Natl Acad Sci U S A. 1923 September; 9(9): 303–308.
PMCID: PMC1085408
A Theory of Color Production: II, Inorganic Compounds
Julius Stieglitz
Proc Natl Acad Sci U S A. 1923 September; 9(9): 308–312.
PMCID: PMC1085409
Mathematics
Groups of Order 2m in Which the Number of the Sub-Groups of at Least One Order Is of the Form 1 + 4k
G. A. Miller
Proc Natl Acad Sci U S A. 1923 September; 9(9): 326–328.
PMCID: PMC1085413
Physics
The Motion of a Falling Chronograph Projectile
L. Thompson
Proc Natl Acad Sci U S A. 1923 September; 9(9): 329–334.
PMCID: PMC1085414
Psychology
Measurements on the Expression of Emotion in Music
C. E. Seashore
Proc Natl Acad Sci U S A. 1923 September; 9(9): 323–325.
PMCID: PMC1085412
Journal Matter
Original table of contents page
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