STATE OF ILLINOIS 
DEPARTMENT OF REGISTRATION AND EDUCATION 
W. H. H. Miter, Director 
BOARD OF 
NATURAL RESOURCES AND CONSERVATION 
W. H. H. Mutter, Chairman 
WILLIAM TRELEASE, Biology JoHN W. AtyorbD, Engineering 
Joun M. Coutter, Forestry Kenpric C. Basecock, Representing the 
Rotimn D. SALispury, Geology President of the University of Illi- 
WittiamM A. Noyes, Chemistry nois 
THE NATURAL HISTORY SURVEY DIVISION 
STEPHEN A. Forses, Chief 
ScHNEPY & BARNES, PRINTERS 
SPRINGFIELD, ILL. 
1921 
47054—1200 
