124 ILLINOIS BIOLOGICAL MONOGRAPHS [222 
EXPLANATION OF PLATE 
Fic. 42. Salt Fork canal looking east from Cottonwood’s road bridge. Note bare patches 
of bottom. September 14, 1920. 
Fic. 43. Salt Fork canal looking southeast from last north and south road bridge. 
September 24, 1920. 
Fic. 44. Salt Fork canal looking west from last farmer’s bridge above St. Joseph. Sep- 
tember 24, 1920. 
