Afli 25 1907 



BULLETIN 



OF THE 



ILLINOIS STATE LABORATORY 



OF 



NATURAL HISTORY 



Urbana, Illinois, U. S. A. 



Vol. VII. J" April, 1907 Article VIII. 



ON THE LOCAL DISTRIBUTION OF CERTAIN ILLINOIS FISHES : AN 

 ESSAY IN STATISTICAL ECOLOGY. 



BY 

 S. A. FORBES, Ph.D. 



