fpecificated Menftruum, 'twill very 

 much disfavour the Opinion of the 

 Chymifts, that will have fome Bo- 

 dies diflbluble onely by Acids as 

 fuch , others by fixt Alkalys , and 

 others again by Volatile Salts 5 fince 

 a Menftruum , that is neither Acid, 

 Lixiviate ^ nor Urinous, is able to 

 difTolve bodies , in fome of which 

 one 5 and in others another of thofe 

 Principles is predominant: So that, 

 if a Liquor be conveniently qualifi- 

 ed y it is not neceflary that it (hould 

 be either Acid to diflblve Pearl or 

 Coral, or Alkalizate to difTolve Sul- 

 phur. But upon what Mechanical 

 account an analyzing Menftruum my 

 operate^ is not neceflary to be here 

 detertaio'd. And I elfewhere offer 

 fome thoughts of miae about it. 



G 4 EX- 



