Volume XII ^V.^?}u^ 



IIS^o BULLETIN 



OF THK 



SCIENTIFIC LABORATORIES 



OF 



DENISON UNIVERSITY. 



EDITED BY 



W. VV. STOCKBERGER, 



PermaHt'nt Secretary Denison Scientific Association. 



DRAINAGE MODIFICATIONS IN KNOX, LICKING AND COSMOCTON COUNTIES. 



With Plates I— 111- 



By W. BLAIR CLARK. 



Granville, Ohio, June, 1902. 



