STATE OF ILLINOIS 
DEPARTMENT OF REGISTRATION AND EDUCATION 
W. H. H. Mrtirr, Director 
BOARD OF 
NATURAL RESOURCES AND CONSERVATION 
W. H. H. Mitter, Chairman 
WILLIAM TRELEASE, Biology JoHn W. Atvorp, Engineering 
Joun M. Courter, Forestry Kenpric C. Bascock, Representing the 
Roitiin D. SaLispury, Geology President of the University of Illi- 
Witr1am A. Noyes, Chemistry nois 
THE NATURAL HISTORY SURVEY DIVISION 
StePpHEN A. Forses, Chief 
eae 
ScHNEPP & BARNES, PRINTERS 
} SPRINGFIELD, ILL. 
1922 
62355—600 
