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PROCEEDINGS 
OF THE 
National Academy / 
OF Sciences 
OF THE UNITED STATES OF AMERICA 
VOLUME 2, 1916 
EDITORIAL BOARD 
Arthur A. Noyes, Chairman Edwin B. Wilson, Managing Editor 
Arthur L. Day, Home Secretary George E. Hale, Foreign Secretary 
J. J. Abel J. M. Coulter W. H. Holmes 
W. B. Cannon C. B. Davenport J. P. Iddings 
J. McK. Cattell Simon Flexner R. A. Millikan 
J. M. Clarke E. B. Frost E. H. Moore 
E. G. CoNKLiN R. G. Harrison Alexander Smith 
Publication Office: Williams & Wilkins Company, Baltimore 
Editorial Office: Massachusetts Institute of Technology, Cambridge 
Home Office of the Academy: Washington, D. C. 
