VOLUME 2 OCTOBER, 1916 NUMBER 10 
PROCEEDINGS 
OF THE 
National Academy 
OF Sciences 
OF THE 
UNITED STATES OF AMERICA 
i 
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 
J. M. Clarke 
E. G. Conklin 
J. M. COULIER 
C. B. Davenport 
Simon Flexner 
E. B. Frost 
R. G. Harrison 
W. H. Holmes 
J. P. Iddings 
R. A. Miliikan 
E. H. Moore 
Alexander Smith 
Publication Office: Williams & Wilkins Comoanv, Baltimore 
Editorial Office: Massachusetts Institute of Technology, Cambridge 
Home Office of the Academy: Washington, D. C. 
IDIDiltillHIIHIIIIilliUinHliniUUUiM 
Bntavd as second^ss matter at the Post Office at Baltimore, Md., under the Act of Atiaost Zi. iSXtZ 
