BULLETIN ^7:^ 



of the 



ILLINOIS NATURAL HISTORY SURVEY 



HARLOW B. MILLS, Chief 



Hill Prairies 

 of Illinois 



ROBERT A. EVERS 



Printed by Authority of the 



STATE OF ILLINOIS 



WILLIAM G. STRATTON, Governor 



DEPARTMENT OF REGISTRATION AND EDUCATION 



VERA M. BINKS, Director 



