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VOLUME 8 
NOVEMBER, 1922 
PROCEEDINGS 
OF THE 
NUMBER 11 
m 
National Academy 
OF Sciences 
OF THE 
UNITED STATES OF AMERICA 
MM I 
^ APR 3 0 mo I 
EXECUTIVE COMMITTEE 
Edwin Bidwkli^ Wilson, Managing Editor 
Raymond Pbarl Vkrnon KelIvOgg 
I PUBLISHED MONTHLY |- 
1 Publication Office : Eschenbach Printing Company, Easton, Pa. 1 
I Editorial Office: Harvard School of Public Health, Boston 17 | 
1 Home Office of the Academy: Washington, D. C. - J 
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Bntered as second-class matter June 21, 1920, at the postoffice at Easton, Pennsylvania, under the act of August 24, 1912. 
Acceptance for mailing at special rate of postage provided for in section 1103, Act of October 3, 1917. Authorized June 18, 1930. 
Price per annum, $5.00 
