u. 
S. DEPARTMENT of agriculture 
BUREAU OF BiOLOGICAt. SURVEY 
Form Bi-689 
NOTICE 
This book is Government property. The finder 
is requested to mail it to the Bureau op Bio¬ 
logical Survey, Department of Agriculture, 
Washington, D. C., or deliver it to the official 
whose name appears above. A detachable addressed 
frank will be found on the last page; by tying this 
on the cover the book may be mailed without post¬ 
age or wrapping if fastened shut. 
GOVERNMENT PRINT WO OITICE 
8—4826 
