28 $f t#e ^edjanical flD^igine 



in the Experiment above recited we 

 obferv'd, that Oyl of Vitriol and wa- 

 ter being firft thaken together , the 

 volatil fait of Sal Armoniac being 

 afterwards put to them, produced a 

 fenfible Coldnefs > yet I found, that if 

 a little Oyl of Vitriol and of the vo- 

 latile Salt were firft put together, 

 though foon after a confiderable pro- 

 portion of water were added, there 

 would be produc'd not a Coldnefs, 

 but a manifeft degree of Heat, which 

 would impell up the liquor in the 

 Thermofcope to the height of fome 

 inches. And I remember too, that 

 though Salt of Tartar will, a* we 

 (hall fee e're long, grow hot in the 

 water , yet having diftill'd fome Salt 

 of Tartar and Cinaber in a ftrong 

 fire, and put the whole Caput mor* 

 tuum into diftiU'd or Rain- water , it 

 made indeed a hiding there as if it 

 had been Quick-lime, but produced 

 no Heat, that I could by feeling per- 

 ceive. I (hall adde, that notonely, 

 as we have (een already , fome un- 

 heeded Circumftances may promote 



or 



