\ 
SURVEY 
Period 
The finder 
This book is Government property 
is requested to mail it to the Bureau op Bio¬ 
logical Survey, Department of Agriculture, 
Washington, D. 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. 
GOVEKHMENT PRINTING OFFICE 
