40 Imptfettlott Mfyt^fMiW*. ■ 



part are natnelefs 5 fo that if need be 

 no wonder , that I fliould make the 

 Mechanical Principles fo much 

 more fertile., that is, applicable to 

 the produ&ion and explication of a 

 fair greater number of Bhtfnomenafh&ix 

 the Chymicalh which, whileft they 

 are confidered but as fimilar bodies, 

 that are Ingredients of mixt and com- 

 pounded ones, are chiefly variable 

 but by the greater or leHer quanti- 

 ty that is employed by Nature or Art 

 to make up the mixt body. And 

 Painters cbferve, that Black and 

 White, though mixt in differing Pro- 

 portions, will ftill make but lighter 

 and darker grays. And if it be faid, 

 that thefe Ingredients, by the Tex~ 

 iure refulting from their mixtures, 

 may acquire Qualities that neither of 

 them had before} I fihall anfwer, that,! 

 toalledge this, is in effeft toconfefs^ 

 that they muft take in the Mechanical 

 Principle^ (for to them belongs the 

 Texture cr Stru&urc of bodies) to af- 

 fift the ChytnicaloxiU. And on this 

 acca(jpn ? to borrow an illuftratt'on 



from 



