ee ae - oe, in one aaah be made to boil, and the 
om of another included cylinder, 
busing notes of aipentite the steam, when let out un- 
“der a moderate pressure, carries off with it a sufficient quan- 
tity of the spirit to burn with a pleasant white flame, free 
from smoke ; by increasing the pressure, the flame will be- 
come in part or wholly blue. Here as in many other ex- 
‘periments, I have noticed, that different coloured flames 
may be produced from the same materials—are the products 
of the combustion different : 
If the steam of water, containing a small proportion of the 
vapour of rosin be driven against iron, at or below a red 
heat, it burns with a pleasant ‘blue flame, which will be ex- 
tended some way back into the column of the vapour, inter- 
mixed with innumerable sparks of very white flame, evi- 
dently particles of the rosin. 
If the vapours, when the proportion of rosin is very stall, 
are made to pass between two plates of iron, at or near a 
red heat, they can be inflamed on the opposite sides of 
the plates, and will then, sometimes, burn with an entirely 
blue flame, although the vapour cannot be inflamed, with- 
: ‘oe the intervention of the 
If the steam of boiling water, be led to the bottom and 
passed up through tallow at a high ——o and then 
cold water to condense the vapour, ned 
; saihaee will float on the surface : and on apiied a flame, it 
would sometimes, take fire, some distance before the flame 
reached it, at rates times it would require, to be in contact 
a few seconds, always beginning to burn with a blue flame, 
and after the whole surface had been sometime enveloped 
m flame, and the heat was such, against one side of the top 
or rim of the vessel, as to cause the water below the oil on 
that side to boil, and pass up through the oil, the flame op 
— this side would be chiefly blue. Does not this show that the 
_ steam was on this side decomposed in passing through the 
- inflamed tallow, and from its sometimes taking fire on the 
es eae: ofa “serge it would appear clearly that there was 
a evaporation of hydrogen, from the tallow, and whe» 
rap with the same sized wick, it appeared to. me to give 
three or four times as much light as other tallow, whicl! 
‘pointed out as I ary that it was rendenea in the — 
mehiy combustible. 
