1* for each 45 feet of descent, it follows that boiling springs must 

 come from a depth of 7;290 feet, and at its starting point has 

 been subject to a pressure of 214 atmospheres, or 3,200 lbs. on 

 the square inch — a pressure sufficient, one would think, to force 

 it through the rocks in its ascent, and so drain it a^vay and 

 prevent its arrival at the surface. 



Now it Avould seem that by an analysis of the waters them- 

 selves, you might gather from whence they had come, through 

 what strata they had passed. 



The principal salts found in the Bath waters are Sulphate of 

 Lime, Chloride of Sodium, Chloride of JMagnesium, and Sulphate 

 of Soda. 



From whence then come these salts 1 lime, soda, and magnesia 

 are to be found in the Granite, and in the oldest rocks of the 

 earth ; but then they are in the form of silicates ; for the solution 

 of those silicates, water charged with carbonic acid gas, or even 

 super-heated water would be sufficient, but in the one case the 

 solution would be carbonates of lime, soda, or magnesia, with 

 silica pure, or in the other, silicate of lime, soda, or magnesia, 

 which, as it cooled, would gradually deposit the silica, and carry 

 off the lime, soda, and magnesia, ultimately to become carbonates. 

 It is even possible, if we can imagine sulphuric acid to be evolved 

 at the same time into the solutions formed by the carbonated 

 water, or the super-heated Avater, that we might have sulphates 

 of lime, soda, and magnesia, but we should never get the chlorides- 

 of sodium and magnesium. And, moreover, it is quite impossible 

 that all these four different salts could be formed at the same 

 time from the same source, the sulphuric acid would decompose 

 the chlorides, even if they could be formed. Hence we must 

 conclude that these salts are not derived from the solution of any 

 igneous rock, in which the bases exist in the form of silicates, 

 that they cannot have been brought from any one common source, 

 and therefore Ave must conclude that they have been in existence 

 previous to their solution as sulphates and chlorides, or at least 

 some of them. 



