( 390 ) 



of the muriate of filver, the eighty grains 

 of liquor muft have contained two grains 

 of this acid. 



It is not eafy to exprefs the furprife I 

 felt at the prefence of this fait, and this 

 water, within a flony fubftance which had 

 not only been fufed, but even vitrified by 

 fubterranean fires. It could not be fufpeded 

 that they had both adhered to the matrait-', 

 fince, befides that it was a new one, like all 

 the others employed in thefe experiments, 

 this was the firft time I had made ufe of it. 



The extraordinary nature of the hd de- 

 termined me to repeat the experiment with 

 the fame fpotted glafs. As 1 had feveral 

 large pieces of ir, I reduced a part of them 

 to powder, which I put into another ma- 

 trafs, and proceeded in the fame manner as 

 before. But, in this cafe, after half an 

 hour's continuance in the fire, the white 

 cloud began to appear in the receiver, 

 which, at length, it entirely filled ; and, 

 afterwards difperfuig, covered the fides with 



a Vs'ater 



