96 ILUNOJS 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 

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

 Station 26. 



