STATE OF ILLINOIS 



DEPARTMENT OF REGISTRATION AND EDUCATION 



A. M. SnELTON, Director 



BOARD OF 



NATURAL RESOURCES AND CONSERVATION 



A. M. S HELTON, Chairman 



William Trelease, Biology 

 Henry C. Cowles, Forestry 

 Edson S. Bastin, Geology 

 William A. Notes, Chemistry 



John W. Alvord, Engineering 

 Charles M. Thompson, Representing 



the President of the University of 



Illinois 



THE NATURAL HISTORY SURVEY DIVISION 

 Stephen A. Forbes, Chief 



SCHNEPP & Barnes. Printers 



Springfield, III. 



1927 



65530—500 



