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Volume 9(2);  February 1923
The cover of the journal
Astronomy
Photographic Determination of Parallaxes with the 100-Inch Reflector
Adriaan Van Maanen
Proc Natl Acad Sci U S A. 1923 February; 9(2): 38–39.
PMCID: PMC1085235
Light and Color Variations of Nova Aquilae 1918.4
Harlow Shapley
Proc Natl Acad Sci U S A. 1923 February; 9(2): 39–40.
PMCID: PMC1085236
Chemistry
On the Hypothesis of Constant Atomic Radii
Ralph W. G. Wyckoff
Proc Natl Acad Sci U S A. 1923 February; 9(2): 33–38.
PMCID: PMC1085234
Genetics
Studies of Subspecific Hybrids in Peromyscus
F. B. Sumner
Proc Natl Acad Sci U S A. 1923 February; 9(2): 47–52.
PMCID: PMC1085238
Geology
Drowned Coral Reefs South of Japan
W. M. Davis
Proc Natl Acad Sci U S A. 1923 February; 9(2): 58–62.
PMCID: PMC1085241
Mathematics
Sets of Conjugate Cycles of a Substitution Group
G. A. Miller
Proc Natl Acad Sci U S A. 1923 February; 9(2): 52–54.
PMCID: PMC1085239
Physics
A Theory of the Hall Effect and the Related Effect for Several Metals
Edwin H. Hall
Proc Natl Acad Sci U S A. 1923 February; 9(2): 41–46.
PMCID: PMC1085237
Physiology
Leucocytic Secretions
Alexis Carrel
Proc Natl Acad Sci U S A. 1923 February; 9(2): 54–58.
PMCID: PMC1085240
Journal Matter
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