Cn) 



ftone. 'Tis true, that the force of fuch 

 Inftancesis indireft, and that they do not 

 cxprcfly prove the Hypotkefts in whofe fa-- 

 vour they are alledgedi but yet they 

 may do it good fervice by difproving the 

 Grounds and Conclufions of the Advcr- 

 faries, and fo (by removing Prejudices ) 

 making way for the better entertainment 

 of the truth. 



Secondly* we may fometimes obtain the 

 fame or the like Quality by Artificial and 

 fometimes even temporary Compofitions, 

 which* being but fa<3ritious bodies, are by 

 Learned Adverfaries confefsM not to have 

 Subftantial Forms , and can indeed rea- 

 fonab!y be prefum'd to have but refulting 

 Temperaments: As will be hereafter ex- 

 emplifi'd in the produ#ion of Green by 

 compounding Blew and Yellow > and in 

 the Eleftrical Faculty of Glafs ; and in the 

 temporary whitcnefs produced by beating 

 clear Oyl and fair Water into an Oint- 

 ment, and by beating water into a froth, 

 and, more permanently, in making Coral 

 white by flawing it with heat j and in 

 divers other Particulars , that will more 

 properly be elfewhere mentioned. 



"Thirdly then, in fome cafes the Quality 

 proposed may be either introducedyOtvaryd* 

 or d(flroy^d in an inanimate body, when 

 no change appears to be made in the bo- 



