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Volume 2(2);  February 1916
The cover of the journal
Astronomy
On the Albedo of the Planets and Their Satellites
Henry Norris Russell
Proc Natl Acad Sci U S A. 1916 February; 2(2): 74–77.
PMCID: PMC1090947
The Minute Structure of the Solar Atmosphere
George E. Hale and Ferdinand Ellerman
Proc Natl Acad Sci U S A. 1916 February; 2(2): 102–108.
PMCID: PMC1090954
Monochromatic Photography of Jupiter and Saturn
R. W. Wood
Proc Natl Acad Sci U S A. 1916 February; 2(2): 109–112.
PMCID: PMC1090955
Botany
Recent Explorations in the Cactus Deserts of South America
J. N. Rose
Proc Natl Acad Sci U S A. 1916 February; 2(2): 73–74.
PMCID: PMC1090946
Chemistry
Polypeptide-Hydantoins
Treat B. Johnson
Proc Natl Acad Sci U S A. 1916 February; 2(2): 69–73.
PMCID: PMC1090945
The Chemical Activity of the Ions of Hydrochloric Acid Determined by Electromotive Force Measurements
James H. Ellis
Proc Natl Acad Sci U S A. 1916 February; 2(2): 83–87.
PMCID: PMC1090949
Geology
The Results of Investigations of the Ecology of the Floridian and Bahaman Shoal-Water Corals
Thomas Wayland Vaughan
Proc Natl Acad Sci U S A. 1916 February; 2(2): 95–100.
PMCID: PMC1090952
Paleontology
Cambrian Trilobites
Charles D. Walcott
Proc Natl Acad Sci U S A. 1916 February; 2(2): 101.
PMCID: PMC1090953
Physics
Quantum Relations in Photo-Electric Phenomena
R. A. Millikan
Proc Natl Acad Sci U S A. 1916 February; 2(2): 78–83.
PMCID: PMC1090948
The Emission Quanta of Characteristic X Rays
David L. Webster
Proc Natl Acad Sci U S A. 1916 February; 2(2): 90–94.
PMCID: PMC1090951
Psychology
Personal Equation and Steadiness of Judgment in the Estimation of the Number of Objects in Moderately Large Samples
J. Arthur Harris
Proc Natl Acad Sci U S A. 1916 February; 2(2): 65–69.
PMCID: PMC1090944
Zoology
Effects of Centrifugal Force on the Polarity of the Eggs of Crepidula
Edwin G. Conklin
Proc Natl Acad Sci U S A. 1916 February; 2(2): 87–90.
PMCID: PMC1090950
Journal Matter
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