$ EeHectiottjsupon itypmfttB* 



Some Spagyrifts, when they fee 

 Aqua fortis dtflolve Filings of Cop- 

 per> conclude from thence^ that the 

 Acid fpirits of the Menfiruum meet in 

 the metal with an Alcali upon which 

 they work ; which is but an unfafe 

 way of arguing, fince good Spirit of 

 Urin, which they take to be a volatile 

 Jieali, and which will make a great 

 Conflid with Aqua fortis^ will, as I 

 have elfewhere iioted 3 diflolye filings 

 of Copper both readily enough and 

 more genuinly than the Acid liquor is 

 wont to do. So when they fee the 

 Magi fiery of Pearl or Coral, made 

 by dropping oil of Tartar into the 

 folutions of thofe bodies made with 

 Ipirit of Vinegar, they afcribe the 

 Precipitation to the fixt Alcali of the 

 Tartar ^ that mortifies the Acidity 

 of the fpirit of Vinegar 5 whereas the 

 Precipitation would no lefs infue,if, 

 infteadofAIcalizatoil of Tartar, we 

 Employ that highly acid liquor which 

 they call Okum Sulpharis per i Cam* 

 panam. 



I 



