i4 flDf $e ^©et^antcal ©tfgine 



EXP EEL VIL 



THis brings into my mind, that 

 though Gunpowder feems to 

 be of fo igneous a nature^ that, when 

 'tis put upon a Goal, it is turn'd pre- 

 fently into flame capable of promo* 

 ting the deflagration of the Char- 

 coal 3 and kindling divers bodies it 

 meets with in its way 5 yet if fome 

 ounces of Gunpowder reduced to 

 powder be thrown into four or five 

 times as much water, it will very 

 manifeftly impart a Coldnefs to it, as 

 experience made with , as well as 

 without, a feal'd Thermofcope has af- 

 fured me. 



This and the foregoing Experi- 

 ment do readily fuggeft an Inquiry 

 into the nature of the Coldnefs^ 

 which Philofophers are wont to op- 

 pofe to that which immediately and 

 upon the firft contaft afFeft the or- 

 gans of fenfe, and which therefore 

 they call A&ual or Formal. 



The 



