appear, I fhallat prefent imploy but 

 thefe two Confiderations. The firji 

 is, that thofe fubftancesthemfelves, 

 that Chyniifts call their Principles 5 

 are each of them indowed with feve- 

 ral Qualities. Thus Salt is a confi- 

 ftent^ not a fluid^ body 5 it has its # 

 weight, 'tis diffoluble in water, is ei- 

 ther diaphanous or opacous, fixt or 

 volatile ? fapid or infipid* (Ifpeak 

 thus disjunctively, becaufe Chymifts 

 are not all agreed about thefe things} 

 and it concerns not my Argument, 

 which of the difputable Qualities be 

 refolved upon.) And Sulphur , ac« 

 cording to them^ is a body fufible, in- 

 flammable^ &c. and^accordiag to Ex- 

 perience^ is confident, heavy, &c. So 

 that 'tis by the help of more primary 

 and general Principles, that we muft 

 explicate fome of thofe Qualities, 

 which being found in bodies^ fuppo- 

 fed to be perfe&ly fimilar or homo- 

 geneous.) cannot be pretended to be 

 derived in one of them from the o- 

 ther. And to fay, that 'tis the nature 

 of a Principle to have this or that 

 B 3 Qaality, 



