132 Illinois IState Laboratory of Natural Ilistory. 



RIVER SLOPES. 



Big Muddy River. 



Mouth 318 



M. & 0. R. R. Crossing 351 



North of Benton 390 



East of Mannen 430 



West of Boyd 500 



Big Vermilion River. 



East line Verniihon count}- 480 



Junction of Middle Fork 530 



West of Higginsville (300 



West line of County (550 



East of Henderson 750 



Crooked Creek. 



Mouth 427 



South line McDonough county 500 



Mouth of Prairie Creek 550 



West of La Crosse GOO 



South of Disco 650 



Desplatnes River. 



Mouth 490 



One mile southwest of Patterson's 500 



Lockport 550 



Lemont 580 



We.st of Thatcher's Park 600 



West of Gurnee 650 



Edwards River. 



Mouth 523 



Near Po meroy 550 



Near Aledo 600 



Near Andover 700 



