FIRST SERIES No. 35 SEPTEMBER, 1920 



' ■ ■ 



UNIVERSITY OF IOWA 

 STUDIES 



STUDIES IN NATURAL 

 HISTORY 



Volume IX Number 1 



A LIMNOLOGICAL RECONNAISSANCE OF 

 WEST OKOBOJI 



by 

 E. A. BIRGE and CHANCEY JUDAY 



PUBLISHED BY THE UNIVERSITY, IOWA CITY 



ttflued monthly throughout the year. Entered at the post ofiiee at Iowa City, Iowa, 

 at aecond class matter. Acceptance for mailing at special rates of postage provided 

 (or in Motion 1103. Act of October 9, 1017, authorised on July 8. 1018. 



