VOLUME 2 FEBRUARY, 1916 NUMBER 2 
! PROCEEDINGS 
I 
I OF THE 
I National Academy 
1 OF Sciences 
I 
I OF THE 
I 
1 UNITED STATES OF AMERICA 
I EDITORIAL BOARD 
I Arthur A. Noyes, Chairman Edwin B. Wilson, Managing Editor 
i Arthur L. Day, Home Secretary George E. Hale, Foreign Secretary 
I J. J. Abel J. M. Coulter W. H. Holmes 
I W. B. Cannon C. B. Davenport J. P. Iddings 
I J. McK. Cattell Simon Flexner R. A. Millikan 
I J. M. Clarke E. B. Frost E. H. Moore 
1 E. G. Conklin R. G. Harrison Alexander Smith 
i Publication Office: Williams & Wilkins Company, Baltimore ' i 
— ^ 
g Editorial Office; Massachusetts Institute of Technology, Boston i 
I Home Office of the Academy: Washington, D. C. | 
E M 
1 I 
1 i 
llillllllilllllllliUIIUIIiiHIIIIIIIiilllilllillHtlililllillillliili^ 
Entered as second-class matter at the Post OflSce at Baltimore, Md., under the Act of August 24, 1912 
