690 



GEOLOGY OF OHIO. 



Limestone gravel soil. 



White clay — unproductive. 



Subsoil of No. 5. 



Yellow clay, or common upland soil. 



Subsoil to No. 7. 



Yellow clay, or common upland soil. 



Upland prairie soil. 



V. WATER-SUPPLY. 



Brief mention must be made, in conclusion, of the water-supply of the 

 county. The subject is one of great scientific and practical interest. It 

 falls strictly within the purview of Geology, while at the same time it 

 has most important relations to sanitary science. 



Greene county has certainly a fair water-supply. It is not quite equal 

 in this respect to Madison county, which must be set down as having, on 

 the whole, the best watered area of the Third Geological District, but, 

 • on the other hand, its natural supply is infinitely better than that of 

 ■ Clermont, Brown, and Hamilton counties. A larger proportion of the 

 water used by man and beast is derived from springs and the streams 

 flowing from them than is usual in this section of the State. The Drift 

 beds give rise to a part of these natural fountains, but all of these will be 

 left out of present account, and attention will be asked only to the springs 

 •■ fchat issue from the bedded rocks. 



