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Volume 4(4);  April 1918
The cover of the journal
Botany
Dynamical Aspects of Photosynthesis
W. J. V. Osterhout and A. R. C. Haas
Proc Natl Acad Sci U S A. 1918 April; 4(4): 85–91.
PMCID: PMC1091408
National Research Council
Minutes of Executive Board of War Organization
John Johnston
Proc Natl Acad Sci U S A. 1918 April; 4(4): 122–127.
PMCID: PMC1091415
Petrology
A Contribution to the Petrography of the South Sea Islands
J. P. Iddings and E. W. Morley
Proc Natl Acad Sci U S A. 1918 April; 4(4): 110–117.
PMCID: PMC1091413
Physics
Mobilities of Ions in Air, Hydrogen, and Nitrogen
Kia-Lok Yen
Proc Natl Acad Sci U S A. 1918 April; 4(4): 91–97.
PMCID: PMC1091409
Thermo-Electric Action with Dual Conduction of Electricity
Edwin H. Hall
Proc Natl Acad Sci U S A. 1918 April; 4(4): 98–103.
PMCID: PMC1091410
Terrestrial Temperature and Atmospheric Absorption
C. G. Abbot
Proc Natl Acad Sci U S A. 1918 April; 4(4): 104–106.
PMCID: PMC1091411
Mobilities of Ions in Vapors
Kia-Lok Yen
Proc Natl Acad Sci U S A. 1918 April; 4(4): 106–109.
PMCID: PMC1091412
Physiology
The Law Controlling the Quantity and Rate of Regeneration
Jacques Loeb
Proc Natl Acad Sci U S A. 1918 April; 4(4): 117–121.
PMCID: PMC1091414
Journal Matter
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