30 &efletfton#upott fytfymtWis 



fome much more evidently Alcali- 

 zate Bodys than thefe Metals are, 

 which yet do not upon their mix- 

 tures produce any fenfible heat} not, 

 I fay, to mention thefe, it is ealif ih 

 difcern, that this anfwer names in- 

 deed two fuppofed efficients of Heaty 

 but does not explicate or declare 

 how thefe Agents produce that Qua- 

 lity, which depends upon a certain 

 vehement and various agitation of 

 the fingly infenfible parts of Bodys, 

 whether the Duellifts., or any other, 

 though very differing , Caufes put 

 them into a motion fo modified. 

 And therefore Gold and Copper by 

 bare Concuffion may be brought to 

 an intenfe degree of heat without 

 the acceffion of any acid patts to 

 work upon them. But then fur- 

 ther, when we are told, that Aqua 

 Regis by its Acidity working on the 

 Metalline Alcalt makes a dilfolutiotf 

 of the Metal 5 I am told indeed 

 what they think to be the Agent in 

 this change, but not at all fatisfied 



how 



