STATE OF ILLINOIS 



DEPARTMENT OF REGISTRATION AND EDUCATION 



A. M. Shelton, Director 



BOARD OF 



NATURAL RESOURCES AND CONSERVATION 



A. M. Shelton, Chairman 



Edson S. Bastin, Geology 

 William A. Noyes, Chemistry 

 John W. Alvord, Engineering 

 William Trelease, Biology 



Henry C. Cowles, Botany 



Charles M. Thompson, Representing 

 the President of the University of Illi- 

 nois 



STATE GEOLOGICAL SURVEY DIVISION 

 M. M. Leighton, Chief 



Jeffersons Printing & Stationfry Co. 



Springfield, Illinois 



1929 



