98 ILUNOIS BIOLOGICAL MONOGRAPHS [196 



EXPLANATION OF PLATE 



Fig. 1. Drainage ditch above Urbana, east of cemetery. Station 2. 



Fig. 2. Salt Fork south of Muncie. Note water willow in center of stream bed; also 

 numerous bare portions of stream bed, the river appearing as a series of pools. October, 1919. 

 Station 26. 



