dupont's ARTESIAN WELL AT LOUISVILLE. 195 



The Source of the Water.— The question naturally arises, if 

 the vein of water supplying this well has a connection with 

 some distant source higher than the surface of Louisville, 

 where is that source? From all that we have been able to 

 learn of the geology of this county, taking Louisville as a 

 center, the first rocks encountered corresponding to the sand- 

 stone (in which the water of the artesian well was struck) are 

 in Mercer, Jessamine, and G-arrard counties, near Dix Creek, 

 to the east of Harrodsburg. The rocks there are said to be 

 cavernous and water-bearing. The elevation is about five 

 hundred feet greater than Louisville, and about seventy-five 

 miles in a straight line from this city. 



This being the most probable source of the water, whence 

 come its mineral constituents? These are obtained from the 

 rocks through which it percolates in its way from its source to 

 the point below Louisville where it has been tapped, and where 

 it will doubtless flow in undiminished quantity for centuries to 

 come, as wells having such deep sources as this are usually 

 inexhaustible. 



Nature of the Water.— The water is perfectly limpid, with a 

 temperature, as already stated, of 76 -J°, which will be invariable 

 all the year round. Its specific gravity is 1.0113. The solid 

 contents left on evaporating one wine gallon to dryness are 

 91 5 J grains, furnishing on analysis 



Grains. 



Chloride of sodium (common salt) 621.5204 



Chloride of calcium 65.7287 



Chloride of magnesium 14.7757 



Chloride of potassium 4.2216 



Chloride of aluminum 1.2119 



Chloride of lithium 1012 



Sulphate of soda 72.2957 



Sulphate of lime 29.4342 



Sulphate of magnesia 77.3382 



Sulphate of alumina 1.8012 



Sulphate of potash 3.2248 



Bicarbonate of soda 2.7264 



Bicarbonate of lime 5.9915 



Bicarbonate of magnesia 2.7558 



Bicarbonate of iron .3518 



Phosphate of soda 1.5415 



Iodide of magnesium 3547 



Bromide of magnesium 4659 



Silica 8857 



Organic matter .7082 



Loss in analysis 8.1231 



Chlorides of rubidium and caesium traces 



915 4582 



