STATE OF ILLINOIS 

 NATURAL HISTORY SURVEY DIVISION 



STEPHEN A. FORBES, CHIEF 



BOARD OF NATURAL RESOURCES AND CONSERVATION 



WILLIAN TRELEASE. Biology 



JOHN M. COULTER .:.... Forestry 



ROLLIN D. SALISBURY Geology 



WILLIAM A. NOTES Chemistry 



JOHN W. ALVORD Engineering 



KENDRIC C. BABCOCK . . . University of Illinois 

 FRANCIS W. SHEPARDSON . Director 



FRANK 0. LOWDEN, GOVERNOR 



SPRINGFIELD, ILL. 



ILLINOIS STATE JOURNAL Co., STATE PRINTERS 

 1920 



