^ga f t<iiaHmiiHi»i»iii iiinii mi ii ihii i iHiiut Kim fiiiiiiuiu »«i in nitii Mt»i ii t« mill i iii iiiiuiiiii iiimuininiiiHaiiiiitRiiiitiiiii t ■tiHiitiiitiHiii nun«i»H) ■■linn lEHii ■»nuntuisauninii:!Haiinn r uiHmuKSiiininif Mf HUM 
1 
5 VOLUME 4 MAY, 1918 NUMBER 5 
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PROCEEDINGS 
I 
I OF THE 
f National Academy 
of Sciences 
I OF THE 
I 
UNITED STATES OF AMERICA 
I 
i 
i 
EDITORIAL BOARD 
3= 
| Raymond Pearl, Chairman Edwin B. Wilson, Managing Editor 
% Arthur L. Day, Home Secretary George E. Hale, Foreign Secretary 
J. J. Abel J. P. Iddings E. H. Moore 
J. M. Clarke Jacques Loeb A. A. No yes 
H. H. Donaldson Graham Lusk Alexander Smith 
E. B. Frost A. G. Mayer . E. L. Thorndike 
R. A. Harper R. A. Millikan W. M. Wheeler 
1 
1 
Publication Office: Williams & Wilkins Company, Baltimore 
Editorial Office: Massachusetts Institute of Technology, Cambridge 
Home Office of the Academy: Washington, D. C. 
