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ILLINOIS ACADEMY OF SCIENCE 



This map on a very large scale illustrates well the 

 inroads made on the forest area by agriculture. Also by 

 reference to its former forest cover, it shows the marked 

 influence of soil on types of forest growth. Beginning 



Map Area. 



with brown silt loam on the east, there are to be found 

 zones and belts of yellow-gray silt loam, yellow silt loam, 

 and black silt loam, and narrow strij)s of stony loam. All 

 of the 240 acres mapped was covered with forest in 1860; 

 now only 15 acres remain. 



