The Subject Propounded; h 



with them fome highly predominant and capital 

 matters, namely, a lixivious fait, and a calcarious 

 earth, which cannot be fuppofed to be derived from 

 any one fort of pyrites -, but probably, if not from, 

 common fait, from lime-ftone ; and if not from 

 this laft, from fpac], which is a calcarious fort 

 of flone ; and if not from fpad, from fo fatty 

 an earth and ftone, as that from which the 

 aluminous lime-earth is generated. For, who 

 is not convinced that thefe fprings generally con- 

 tain fomething vitriolic, which remaining un- 

 touched by the lixivious fait, exhibits a formal vi- 

 triol ; or, in other words, its acid fait may be made 

 to feparate from the alcali ; and thus form a bit- 

 ter fpring-falt, its metallic earth falling as an ochre 

 to the bottom. And fulphur itfelf formally efflo- 

 refces about fuch mineral fprings, as thofe of Aix- 

 la-Cbapelle in particular. Now fulphur, the vitri- 

 olic acid, and a metallic ochre, are parts derived 

 from pyrites, and not from ftone-coal or bitumen. 



chap: 



