Analyfis of the Air . 283 
And when a Brimfione Match which was 
placed in an cxhaufted receiver was heated 
by the focus of a burning glafs fo as to melt 
the Brimftone , yet it did not kindle into 
fire nor confume, notwithftanding the 
ftrength and vigour of the adionandre-a&ion 
that is obferved between light and fulphure- 
ous bodies. Which is affigned by the illuf- 
trious Sir Ifaac Newton , as “ one reafon 
“ why fulphureous bodies take fire more 
“ readily, and burn more vehemently than 
“ other bodies do, qu. 7.” What his notion 
of fire and flame is, he gives us in qu e 
9. and 10. Qu. 9* “ Is not fire a body heated 
“ fo hot as to emit light copioufly? For 
“ what e 1 fe is a red hot /wz than fire? And 
“ what elfe is a burning Coal , than red hot 
“ Wood? Qu. 10. Is not flame a vapour, 
“ fume or exhalation heated red hot, that is 
C€ fo hot as to flame ? For bodies do not flame 
“ without emitting a copious fume, and 
u this fume burns in the flame. Some 
“ bodies heated by motion or fermentation, 
<c if the heat grow intenfe, fume copioufly, 
“ and if the heat be great enough, the fumes 
u will fhine and become flame : Metals in 
“ fufion do not flame for want of a copious 
u fume,except fpelter which fumes copioufly, 
“ and 
