336 Anthracite 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, 
ss intense. 
The flame from both Lehigh and Schuylkill coal is often 
of adelicate 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. 
ev S 
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- 
Sgn pale, although it is believed to be generally 
ighter than that from the anthracite. 1 have not recently 
seen the Rhode Island anthracite burn; we should expect 
Bs 
the loss of weight sustained by the different varieties of coal, and for its 
want of correspondence with the gas evolved. It is certainly 
— ‘it may be owing to water, no steps having been taken to collect 
“s That west of the Alleghany is bituminous as that at Pittsburgh, oe 
+ And this without the incumbrance of bitumen and other products 
the distillation of that species of coal, of wood, &c. and pro with 
less carbonic acid than in mostsimilar cases. 
. 
Ls 
Sates Wy eet 
