Bulletin 



OK THE 



Illinois State Laboratory 



OF 



Natural History 



Urbana, Illinois, U. S. A. 



STEPHEN A. FORBES, Ph.D., L.L.D., 

 Director 



Vol. XL July, 1915 Article L 



AN OUTLINE OF THE RELATIONS OF ANIMALS 

 TO THEIR INL,AND ENVIRONMENTS 



BY 



Charles C. Adams, Ph.D. 



