( 4o<> ) 



rcdj and the acid of which was inanlfeftly 

 muriatic, from the fleecy turbidnefs produced 

 by mixing it with the nitrate of filver. 



On comparing all thefe facls, it appears 

 that, of nine volcanic produd:s expofed to 

 the a(Stlon of the fire and fufed, fix nnani-^ 

 fefted the prefence of the muriatic acid, and 

 in three not the leaft fign of it appeared. 

 From a comparifon of the local circum- 

 ftances of thefe nine produd:s, we mufl: be 

 convinced that the muriatic acid does not 

 exift in thefe produ<51:s when they are either 

 fufed, or heated to rednefs ; but that it 

 unites with them afterwards, fince the three 

 lavas, one from Vefuvius, another from 

 Stromboli, and a third from Etna, which 

 had been recently ejected from the fubter- 

 ranean furnaces, contained none, though 

 they afforded a fmall portion of water ; 

 while the fix others which had ceafed to 

 burn for a longer or (horter time, gave a 

 greater or lefs quantity of this acid. It is 

 alfo a confirmation of this fa<5l, and merits 

 attention, that the fame lava of Stromboli 

 5 war. 



