and J^olmitfpn of WloUtility* 5 



niac, whether it be a natural or fac- 

 titious things or whether it be per- 

 fectly fimilar, or compounded of dif- 

 fering parts., I look upon the intire 

 Corpufcle as a volatile portion of 

 matter 3 and fo I doe on a Corpufcle 

 of Sulphur, though experience (hews 

 when 'tis kindled, that it has great 

 ftore of acid Salt in it, but which is 

 not extricated by bare fublicnation : 

 And fo Colcothar of Vitriol falls un- 

 der our confederation as a fixt body, 

 without inquiring what cupreous or 

 other mineral and not totally fixt 

 parts may be united with the Earthly 

 ones 5 fince the fires, we expofe it 

 to 5 do not feparate them. 



And this being premifed in the ge- 

 neral, I now proceed to fome parti- 

 culars* And firft to make a volatile 

 body, the parts fhould be very fmall. 

 For, ceteris parihus^thofe that are fo, 

 are more eafily put into motion by 

 the aftion of the fire and other A- 

 gents, and confequently more apt to 

 be elevated, when, by the determi- 

 nation of the movent* the (ituatiqp 

 A3 of 



