$36 luthracite Coal of Pennsylvania. 
of comparing the colour of the flame, I burned the gases, 
successively, from a jet, with the aid of pressure ;—the gas 
from the Schuylkill coal burned with a yellow flame—that 
from the Lehigh with a similar appearance but paler— 
that from the Wilkesbarre coal was tinged with blue, purple 
and red—while that from the bituminous coal and especially 
from the cannel coal gave, in its combustion, a brilliant white 
light, similar to that of the heavy carburetted hydrogen gas; 
but less intense. 
The flame from both Lehigh and Schuy!kill coal is often 
of a delicate yellow in the furnaces, and not unfrequently, it 
is tinged with rich green and blue, indicating foreign sub- 
stances, perhaps copper, and sulphur, in solution in the gas 
or in mixture in the form of vapour. 
If we admit the Pennsylvania coal east* of the Alleghany, 
to be anthracite (and no one I believe has ever questioned the 
fact) we must hereafter qualify our statements as to the flame 
obtained by the combustion of the anthracite, and say that 
it sometimes burns with abundant flame—so abundant indeed 
that it affords an easy method of obtaining a pleasing variety 
of carburetted hydrogen gas, for exhibition in a lecture 
room.t Noone would, however, have supposed that the an- 
thracite would in any case afford as much inflammable gas as 
the bituminous coal, and even sometimes as much as the 
richest variety. The difference then seems to be not so 
much in the quantity, as in the quality, of the gas : that from 
the anthracite is unfit for artificial illumination, as the light 
which it affords is too pale, while that from bituminous coal 
burns with a brighter flame—sometimes equal to that of the 
brightest lamps and candles—but at other times it is com- 
paratively pale, although it is believed to be generally 
brighter than that from the anthracite. I have not recently 
seen the Rhode Island anthracite burn; we should expeet 
. — 2 eaten pepe CIS VRE Miller tern” 
the loss of weight sustained by the different varieties of coal, and for its 
want of cerrespondence with the gas evolved. It is certainly possible 
that it may be owing to water, no steps having been taken to collect 
that fluid. 
* That west of the Alleghany is bituminous as that at Pittsburgh, &e. 
+ And this without the incumbrance of bitumen and other products of 
the distillation of that species ‘of coal, of wood, &c. and probably wifh 
ess carbonic acid than in most similar cases. 
