VOLUME 1 
SEPTEMBER, 1915 
NUMBER 9 
I 
PROCEEDINGS 
OF THE 
National Academy 
OF Sciences 
EDITORIAL BOARD 
Arthur A. Noyes, Chairman 
Arthur L. Day, Home Secretary 
Edwin B. Wilson, Managing 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 
Publication 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 Office at Baltimore, Md., under the Act of August ?.4, 1912 
