and psoimttiott of CKolatilttp* I s 



the volatilization of it, I (hall add* 

 that in fome cafes the Comminution 

 may be much promoted by employ- 

 ing Phyfical, after Mechanical, ways> 

 and that, when the parts are brought 

 to fueh a Ach of exiguity, they may 

 be elevated much better than before. 

 Thus, if you take filings of Mars, and 

 mix them with Sal Armontack^ fome 

 few parts may be fublimed } but if> 

 as I have done, you diflblve thofe fi- 

 lings in good Spirit of Salt inftead of 

 Oil of Vitriol^ and having coagula- 

 ted the folution, you calcine the gree- 

 nifh Cry (tails or vitriolum Martis that 

 will be afforded, you may with eafe, 

 and in no long time, obtain a Crocus 

 Martis of very fine parts 5 fo that I 

 remember, when we exquifttely min- 

 gled this very fixt powder with a 

 convenient proportion of Sal Armo- 

 niaci and gradually prefs'd it with a 

 competent fire, we were able to ele- 

 vate at the firft Sublimation a confix 

 derable part of it } and adding a like, 

 or fomewhat inferiour, proportion of 

 frefh SalArmoniac to the Caput Mor- 



tuumm 



