18 d)f tl)e ^ec^am'cal Engine of 



Tin-glafs, Spelter, Lapis Calaminam^ 

 &c and the fixed Salt of Nitre ope- 

 rates upon Sulphureous Minerals, as 

 common Sulphur, Antimony, and di- 

 vers other Bodies, of which I elfc- 

 where make mention. 



EX PER. VIIL 



BY the former Trials it has ap* 

 pear'd, that the increafeof Mo- 

 tion in the more penetrating Corpu- 

 (cles of a Liquor, contributes much 

 to its Solutive power $ and I (hall 

 now adde, that the Shape and Size, 

 which are Mechanical affections, and 

 fometimes alfo the Solidity of the 

 fame Corpufcles does eminently con- 

 cur to qualifie a Liquor to diffolve 

 this or that particular body. Of 

 this, even fome of the more famili- 

 ar praftices of Chymifts may fupply 

 us with Inftances. For there is no 

 account fo probable as may be given 

 upon this fuppofition 3 why Aqua For- 

 ^which will diffolve Silvex^without 



medling 



