C 398 ) 

 gafeous fubftances obtained from them have 

 been already defcribed. It now remains to 

 flate the refuhs relative to the prefent en- 

 quiry. 



From the lava of Vefuviiis, containinir 

 garnets, was obtained in the receiver tv^'o 

 grains of water, which did not in the leaft 

 change the tind:ure of turnfole, but pro- 

 duced a light-blue milkinefs by the mixture 

 of nitrate of filver. It could not, therefore, 

 be faid that this lava was entirely deflitute 

 of muriatic acid. 



The lava of Vefuvius which had flowed a 

 ihort time before I vifited that volcano, left 

 at the bottom of the receiver four grains of 

 water, which, when trred by there-agents, was 

 found not to differ from the diftilled water. 



From_ the lava of Vulcano, which is ex- 

 ternally an enamel, I obtained 4^ grains of 

 water, which was without odour, but fome- 

 v/hat acidulous ; and the precipitation in 

 white fleeces, caufed by the nitrate of fil- 

 ver. 



