Co?coBbeneftfo?€o?rofib.lft^ 19 



rnedling with Gold, fhould, by the 

 addition of a fourth part of its weight 

 pf Sal Armoniac, be turn'd into A- 

 qna Regia, which, without rnedling 

 with Silver, will diflblve Gold, But 

 there is no neceffity of having re- 

 courfe to (b grofs and compounded 

 a Body as Sal Armoniac to enable 

 Aqua Forth to diflblve Gold : For, 

 the Spirit of common Salt alone be- 

 ing mingled in a due proportion, will 

 fuffice for that purpofe. Which (by 

 the way) (hews, that the Volatile 

 Salt of Urine and Soot, that concur 

 to the making up of Sal Armoniac, 

 are not neceflary to the diflblution 

 of Gold , for which a Solvent may 

 be made with Aqua. Forth and crude 

 Sea-falt. I might adde, that the 

 Mechanical affe&ions of a Menfiruum 

 may have fuch an intereft in its dif- 

 folutive power,' that even Mineral or 

 Metalline Corpufcles may become 

 ufeful Ingredients of it, though per- 

 haps it be a diftill'd Liquor 5 as might 

 be illuftrated by the Operations of 

 fotqe compounded Solvents, fuch as 

 B 3 is 



