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VOLUME 8 
OCTOBER, 1922 
NUMBER 10 
PROCEEDINGS 
OF THE 
National Academy 
OF Sciences 
OF THE 
UNITED STATES OF AMERICA 
^ APR 3 0 1926 ^ 
/ 
EXECUTIVE COMMITTEE 
Edwin BidweIvIv Wii^son, Managing Editor 
Raymond Pearl Vernon Kei^IvOGG 
I PUBLISHED MONTHLY 1 
i Publication Office: Eschenbach Printing Company, Easton, Pa. I 
1 Editorial Office: Harvard School of Public Health, Boston 17 1 
1 Home Office of the Academy: Washington, D. C. 1 
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Entered us second-class matter June 21, 1920, at the postoflSce at Easton, Pennsylvania, under the act of August 24, 1912. 
Acceptance for mailing at special rate of postage provided for in section llOS, Act of October 3, 1917. Authorized June 18, 1920. 
Price per annum, $5.00 
