124 ILUNOIS BIOLOGICAL MONOGRAPHS [222 



EXPLANATION OF PLATE 



Fig. 42. Salt Fork canal looking east from Cottonwood's road bridge. Note bare patches 

 of bottom. September 14, 1920. 



Fig. 43. Salt Fork canal looking southeast from last north and south road bridge. 

 September 24, 1920. 



Fig. 44. Salt Fork canal looking west from last farmer's bridge above St. Joseph. Sep- 

 tember 24, 1920. , 



