or p^oijuctton of f tjtnefo 23 



Coalition, being put into a Retort., 

 may be kept a pretty while in fufion, 

 before the metal will let go the Ni- 

 trous fpirits. When we poured Oil 

 of Vitriol upon the Calx of Vitriol, 

 though many Phlegmatick and p- 

 ther Sulphureous particles were dri- 

 ven away by the excited Heat 5 yet 

 the faline parts, that combined with 

 the fixt ones of the Colcothar, ftuck 

 faft enough to them, not to be eafily 

 driven away. And if Oil of Vitriol 

 be in a due proportion dropt upon 

 Salt of Tartar, there refults a Tarta* 

 rum vitriolatum^ wherein the acid 

 and alkalizate parts cohere fo ftrong* 

 ly, that 'tis not an ordinary degree 

 of fire will be able todisjoyn them. 

 Infomuch that divers Chymifts have 

 (though, very erroniouily) thought 

 this compounded Salt to be indeftru- 

 ftible. But a lefs heavy liqueur than 

 the ponderous Oil of Vitriol may by 

 an Alkaly be more ftrongly detained 

 than that Oil it felf 5 experience ha- 

 ving affured me, that Spirit of Salt 

 being dropt to fatiety upon a fixt 



B4 : 4k* l h 



