Analyjis of the Ah. 285 



And when a Brimjione Match, which was 

 placed in an exhaufted receiver, was heated 

 by the focus of a burning-glafs fo as to melt 

 the Brim/lone, yet it did not kindle into fire, 

 nor confume, notwithstanding the ftrength 

 and vigour of the action and re-a&ion that is 

 obferved between light and fulphureous bo- 

 dies. Which is affigned by the illuftrious Sir 

 Ifaac Newton, as cc one reafon why fulphu- 

 " reous bodies take fire more readily, and 

 " burn more vehemently than other bodies 

 <c do, Qu. 7." What his notion of fire and 

 flame is, he gives us in Qu. 9. and 10. Q11.9. 

 cc Is not Fire a body heated fo hot as to emit 

 " light copioufly ? For what elfe is a red-hot 

 " Iron than Fire ? And what elfe is a burn- 

 < c ing Coal, than red-hot Wood?" Qu. 10. 

 <c Is not Flame a vapour, fume or exhalation, 

 <c heated red-hot, that is, fo hot as to flame? 

 ci For bodies do not flame without emitting 

 " a copious fume, and this fume burns in 



<c the flame. — Some bodies heated bv 



ic motion or fermentation, if the heat grow 

 " intenfe, fume copioufly -, and if the heat be 

 <{ great enough, the fames will fhine, and 

 * become flame: Metals in fufion do noc 

 " flame for want of a copious fume, except 

 <c fpelter, which fumes copioufly, and thcre- 



<( 



bv 



