io Jmperferttoitof t|>e d^mift'« 



in an ufual Topic of theirs, according 

 to which they conclude, That I know 

 not how many Qualities, as well ma-- 

 nifeft as occult, muft be explicated 

 by their tria prima, becaufe they are 

 not explicable by the four elements 

 of the Peripatetic^/. To make which 

 argumentation valid, it muft be pro- 

 ved, C which I fear it will never be ) 

 that there are no other Wayes, by 

 which thofe Qualities may be expli- 

 cated., but by a determinate number 

 of Material Principles, whether four 

 or three: Befidesthat, till they have 

 fhewn that fuch Qualities may be in- 

 telligibly explicated by their Prin- 

 ciples, the objection will lye as ftrong 

 for the Ariftoteliant againft them, as 

 for them againft the Arifiotelians. 



CHAP. II. 



NExt I confider, that there are 

 divers Qualities even in mixt 

 bodies, wherein it does not appear, 

 that the ufe of the Chy mical Do&rine 



is 



