( 394 } 



the neck of the retort began to be covered 

 with a white veil, which afterwards became 

 more denfe. No kind of gas was formed 

 on the mercury. 



' Having broken the retort, I found that 

 this veil was only the more fubtile part of 

 the pulverized glafs, fublimed by the heat, 

 and remaining adhefive to the retort. No 

 fufion followed in the glafs. The two drops 

 of water, which might amount in quantity 

 to nine or ten grains, were extremely acid 

 to the tafte, and it appeared from the appli- 

 cation of re- agents that the acid was purely 

 muriatic. 



The glafs remaining untouched, this ex- 

 periment fhowed that the water and the 

 muriatic acid were not in combination with 

 the parts of the glafs, but only adhefive to 

 them ; it appeared, likewife, that the quan- 

 tity of acidulous water produced was not 

 equal to that obtained in the matrafies, be^ 

 caufe the heat was not fo great. 



The 



