52 ©f t(je ^ec&am'cal ©i&fite 



merit enough to produce a fenfiblc 

 Heat j efpecially if we admit , that 

 there is fuch a change made in the 

 Pores, as occafions a great increafe 

 of this agitation, by the iogrefs and 

 a&ion of fome fubtile ethereal mat- 

 ter , from which alone Monjieur des 

 Cartes ingemoufly attempts to derive 

 the Incalefcence of Lime and wa- 

 ter , as well as that of metals diiTol- 

 ved in corrofive Liquors \ though as 

 to the ?k£nomena we have been con- 

 lldering, there feems at leaft to con- 

 cur a peculiar difpofnion of body, 

 wherein Heat is to be produced to 

 dp one or both of thefe two things, 

 namely, tp retain good, ftore of the 

 igneous Effluvia , and to be, by their 

 adhefion or fome other operation of 

 the fire , reduced \o fuch a Texture 

 of its component Particles, as to be 

 fit to have them eafily penetrated, 

 and briskly as well as copioufly diffi- 

 pated , by invading water. And 

 this Conje&ure (for I propofe itas 

 no other ) feems favoured by divers 

 fMnomma-i fome whereof I (hall 



now 



