INTRODUCTION. 
I 
This is the second of a series of publications, issued by authority of the 
State Board of Education of Illinois, and designed especially to elucidate 
the natural history of this State. The first number was published in De- 
cember, 1876, as Bulletin No. 1 of the Illinois Museum of Natural History ; 
but a change in the title of the institution issuing them, necessitates a 
change in the title of the series. 
S. A FORBES, 
Director 111. State Lab. of Nat. Hist. 
Normal, 111., Dec. 12, 1877. 
