Opticks 1717 - Up

ngainfi the Finger~‘fo as to be felt. AlId the
kmx things have been found by rubbi.ng a long
zillld 1ilSge Cjilinder of Glafs Or AlllbCU with a Y+
f’er held in ones ktnd, and continuing the fri-
&ion till the GlaG grew warm.
@i, 3, Is not I&e n Body heated. fo hot aS RI
emit Light copioully ? For wilnt eli‘c is 21 red
hot iron than Fire? And what eli‘e is a burning
Coal than red hot Wood ?
i ’‘<
2~. IO. Is ndt Flame a ‘$Tapow., Fume ox B1:2~!
h&~tJion heated red. hot, that is, f~ hot as ‘tap
flke? For Bddies do not flame without emitting
a copious FLI~II~, and .tliis Fume burns in
the E’lame. The Igtfis J7ai2w5 is 3 Vapr+ flljning
without heat, and is there not the Gune
difkrence between this Vapour and ‘Flame, as
between rotten I&rood flining without heat and
burning Conk of Fire ? In dif~illing hot Spirits,
if the Head of the Still lx taken of?‘, the Vapour
which arcends out of the Stiil will take f-%x
at the Flame of 3 Can&c, and turn into Flame,
and the Fl~lile will run along the Vapour from
the Candle to the Still. Some Bodies heat-d by
Motion or licrmentAion, if the heat groisr in-’
tenfe, fLlil1~ copioufly , and if the heat be great
enough the Fumes wiil flkleand become Flame,
Metals in fuGon do not flame for want df n copious
Fume, except S elter, which fumes copioufly
, and thereby f- I; ames, All flaming Bodies,
as Oil, Tallou7, Wax, Wood, fo@l Co&,
Pitch, Sulphur, by flaming w&e and vani& into
burning Smoke, which Smoke, if the Flame
be put out, is vcsy thick and vifible, and Sometimes
fmells ftrongly, but in the I?lame lofes its
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