/ 
PROCEEDINGS 
OF THE 
National Academy 
OF Sciences 
OF THE UNITED STATES OF AMERICA 
VOLUME 3, 1917 
EDITORIAL BOARD 
Arthur A. Noyes, Chairman 
Arthur L. Day, Rome 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. Coulter 
C. B. Davenport 
Simon Flexner 
E. B. Frost 
R. G. Harrison 
W. H. Holmes 
J. P. Iddings 
R. A. Millikan 
E. H. Moore 
Alexander Smith 
Publication Office: Williams & Wilkins Company, Baltimore 
Editorial Office: Massachusetts Institute of Technology, Cambridge 
Home Office of the Academy : Washington, D. C. 
