VOLUME 1 DECEMBER, 1915 ^fUMBER 12 
PROCEEDINGS I 
OF THE I 
National Academy | 
OF Sciences I 
1 
OF THE UNITED STATES OF AMERICA I 
1 
EDITORIAL BOARD 
Arthur A. Noyes, Chairman 
Arthur L. Day, Home Secretary 
Edwin B. Wilson, Mana^ng Editor 
George E. Hale, Foreign Secretary 
J. J. Abel 
W. B. Cannon 
J. McK. Cattell 
E. G. Conklin 
J. M. Coulter 
Henry Crew 
C. B. Davenport 
Simon Flexner 
E. B. Frost 
Moses Gomberg 
R. G. Harrison 
W. H. Holmes 
J. F. Kemp 
E. H. Moore 
Charles Schuchert 
Publlcatipn Office; Williams & Wilkins Company, Baltimore 
Editorial Office: Massachusetts Institute of Technology, Boston 
Home Office of the Academy : Washington, D, C. 
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Entered as second-class matter at the Post Oflce at Baltimore, Md., under the Act of August 24, 1913 
