STATE OF ILLINOIS 

 William G. Strattox, Governor 



DEPARTMENT OF REGISTRATION AND EDUCATION 

 Vesa M. Bisks, Director 



NATURAL HIST O R ^' S U R \' E ^' D I \' I S I O N 

 Harlow B. Mills. Chief 



^'olume 26 



HILLFTIX 



Article 5 



Hill Prairies of Illinois 



ROBERT A. EVERS 



Printed liy Authority of the Stale of Illinois 



I' R B A N A . I L I. I X (T I S 

 A II (I II St 1955 



