and^oDutttonofaolatiltt^ 55 



fcarce doubt* but that in ftri&nefs di- 

 vers of thofe bodies that pafs for ab- 

 folutely fixt, are but femi-fixt, or at 

 leaft but comparatively and relative- 

 ly fix'd, that is, in reference to iuch 

 degrees of fire, as they are wont to 

 be expofed to in the Diftillations, 

 Sublimations^ &c. of Chymifts, not 

 fuch as are given in the raging fires of 

 Founders,and Glafs-makers. And per- 

 haps even the fires of Glafs-makers 

 and Say-mafters themfelves are not 

 the moft intenfe that may poffibly 

 be made in a (hort time, provided 

 there be but fmall portions of matter 

 to be wrought on by them. And in 

 efFe&, I know very few bodies, be- 

 fides Gold, that will perfevere totally 

 fixt in the vehementeft degrees of fire 

 that Trials have made me acquainted 

 with. And I elfewhere tell you, that, 

 though Tin, in our Chymical Reyer- 

 beratories themfelves, is wont to be 

 reduced but into a Calx that is repu* 

 ted very fixt 5 yet in thole intenle 

 fires, that a Virtnofo of my acquain- 

 tance ufes in his Tin-Mines, there is 



not 



