STATE OF ILLINOIS 



DEPARTMENT OF REGISTRATION AND EDUCATION 



DIVISION OF THE 



NATURAL HISTORY SURVEY 



STEPHEN A. FORBES. Chief 



Vol. XV. BULLETIN Article VIL 



Some Observations on the Oxygen Require- 

 ments of Fishes in the Illinois River 



BY 



DAVID H. THOMPSON 



PRINTED BY AUTHORITY OF THE STATE OF ILLINOIS 



URBANA. ILLINOIS 

 October. 1925 



