ofAlcaftanD ActDum. i) 



the produ&ion of bubbles is not a 

 neceffary effed or concomitant of 

 Heat excited by Confli&s> but de- 

 pends very much upon the peculiar 

 Difpofition of Bodies put together to 

 extricate^produce, or intercept par- 

 ticles df Air p (or Steams^ for the time 

 equivalent to them^ and therefore as 

 Oil of Vitriol^mixt in a due proporti- 

 on with fair water 5 may be brought to 

 make the water too hot to be held ia 

 ones hand, without exciting bubbles} 

 fo I have found by trials purpofely 

 made*that Alcalizat Spirit of Urine 

 drawn from fome kinds of Quick- 

 lime, being mixt with Oil of Vitriol 

 moderately ftrong 5 wou!d produce art 

 intenfe Heat, whileft it produced ei- 

 ther no manifeft bubbles at al!^ or 

 fcarce any, though the Urinous Spi- 

 rit w?'S ftrong, and in other Trials 

 operated like an Alcaliy.znA although 

 alfo with Spirit of Urin, made prfe 

 the common way, the oil of Vitriol 

 wilt produce a great hiding and a 

 multitude of confpicuous bubbles. 



B Osk 



