i86 



ILLUSTRATIONS OF THE 



efl air, ading on an enormous quantity of 



bullible matter. With 



thefe, fuch d 



of heat cann 



ing into the region of 



Now, in the firll 

 temperature 



be 



g 



gined, without fly 



place, 

 which is here 



bably not neceiTary to the purpofes of 



the high degree of 

 derftood, is pro- 



dpl 



has jufl been fli 



the word, but 



and, in the fe- 

 z ufual fenfe of 

 which is required for that 



th 



jjurpofe ', and there is nothing chimerical in fup- 

 pofing, that nature has the means of producing 



•eat degree, without the 



h 



in a 



very g 



ffiftance of fuel or of 



air. 



Fridion 



foujce of heat, unlimited, for what we know, ir 

 its extent, and fo perhaps are other operations, 

 both chemical ar 

 combuflible fubft 



d mechanical ; 

 inces, or vital 



either 

 :erned 



the heat th 



produced. So alfo the heat of 



the fu 



th 

 of 



that h 



ays in the focus of a burning glafs 



mod intenfe that is kno 



is 



fubft 



dependent 



a 



jull mentioned ; and, thoug 



\j could not calcine a me 



tal 



J 



burn a piece of w 



thout oxyg 



nous gas, it 



Id doubtlefs produce as high 



temperature in the abfence as in the prefe 

 of that gas. 



It 



* Geol. Efiays, p. 454 



