of <£&pmual precipitation* 5 



rality oi Precipitations this Do&rine 

 will hold ; For in fome that we have 

 made of Gold and Silver in proper 

 Menftruums, after the fubfiding mat- 

 ter had been well waflied and dried, 

 feveral Precipitates of Gold made, 

 Tome with oil of Tartar, which a- 

 bounds with a fixed fait, and is 'the 

 ufual Precipitant, and fome with an 

 Urinous Spirit, which works by Ver- 

 tue of a fait highly fugitive or Vo- 

 latile, I found the powder to exceed 

 the weight of the Gold and Silver I 

 had put to diflblve $ and the Eye it 

 felf fufficiently difcovers fuch Preci- 

 pitates not to be meer metalline pow- 

 ders, but Compofitions, whofecon- 

 fifting,not (as hath been by fome bo- 

 dy fufpe&ed) of the combined Salts 

 alone, but of the metalline parts 

 alfo 5 may be ftrongly concluded not 

 only from the ponderoufnefs of di- 

 vers of them in reference to their 

 bulk,but alfomanifeftly from the re- 

 duction of true malleable metals from 

 feveral of them, 



CHAP, 



