104 ILLINOIS BIOLOGICAL MONOGRAPHS [202 
EXPLANATION OF PLATE 
Fic. 8. Bench mark 655, Salt Fork, above road bridge. Station 17. September 13, 1918. 
Fic. 9. Salt Fork two and a half miles north of Sidney, looking north, the Champaign 
moraine on the left, a flood plain on the right. Station 18. September 13, 1918. 
