and^oljurttonofcaDlattltt^ 29 



firjiy the parts of the former may be 

 much more difpofed for avolation 

 than is necefTary to their own Vola- 

 tility* As when in the making of 

 Sal Armoniac, the faline particles of 

 Urine and of Soot are more fugitive 

 than they need be to be themfelves 

 fublimedj and thereby are advanta- 

 ged to carry up with them the more 

 iluggifti corpufcles whereof Sea- fait 

 confifts. And next they may be of 

 figures fo proper to faften them well 

 to the body to be elevated, that the 

 more fugitive will not be driven a- 

 way or disjoyned from the more fixt 

 by fuch a degree of Heat as is fuffici- 

 ent to raife them both together : To 

 which efFefl: the congruity or figura- 

 tion is as well required, as the light- 

 nefs or volatility of the particles of 

 the additament. And therefore fome 

 of the fugitiveft bodies that we 

 know, as Spirit of Wine, Cam- 

 phire^ &c* will not volatilize many 

 bodies which will be elevated by 

 far lefs fugitive additaments \ becaufe 

 the corpufcles of Spirit of Wine ftick 



not 



