Anthracite Goal of Pennsylvania. 333. 
“Fhe different varieties of coal began to give out gas within a, 
Tew minutes—but the Schuylkill began before the Lehigh, and 
in the earlier stages of the experiment, the gas from that coal 
was the most abundant; soon however the gas came from 
both with apparently equal rapidity, the Schuylkill ceased 
first, and that from the Lehigh continued to come over after 
the other had done, until the entire product of gas was nearly 
the same from both varieties of coal, but rather greater 
from the Lehigh. The Wilkesbarre coal much exceeded both 
the others in the abundance of gas which it afforded. The 
more precise results will be given ina table farther on, along 
ivith those obtained from some other varieties. ke 
The most remarkable of these was the Rhode Island an- 
thracite. From this I obtained no gas at all, although the ex- 
periment was conducted in the same manner with the others 
that have been related. The specimen of coal was one that 
had lain several years in a garret, but I am not aware that this 
could have had any other effect than to dissipate any moisture 
that might have been in the fissures. Combined hydrogen, or 
combined moisture, could scarcely have been affected merely 
by exposure toa dry atmosphere; still I presume that a spe- 
cimen recently taken from the mines, would afford some gas. 
The Wilkesbarre coal had however lain several years ina very 
dry upper room. I next tried a comparative experiment 
with good bituminous Liverpool coal, using the same quantity, 
and proceeding in the same manner. I found the result such 
as I had many times before obtained, from this species of coal. 
The inflammable gas was readily and abundantly obtained, 
but not much more so than from the Lehigh anthracite. It 
will be seen in the table that it yielded but one twentieth part 
more gas than the Lehigh, and only half as much as the an- 
thracite of Wilkesbarre. 
Sp. grav.) Sp. grav.| Weight lost; Inflammable 
vJinthracite. before after ig- |by aon gas givenout Hardee 
grains.{ignition. | nition. | grains. | wine pints. ‘gmibion.: 
Lehigh, 876} 1,55 1,77 259 19 | Scratch the hard- 
Schuylkill, sr 1,52 1,77 324 18 jest window glass 
Wilkesbarre, 876] 1,55 1,77 170 40 readily. 
Bhode Island, 876] 1,75 100 8 do. do. 
Bit. Coal. < 
» Liverpool, $76] 1,33 0,65 | 836 | 20 do. do. 
Cannel, - 876} 1,33 0,83* 352 40,75 do do. 
* It may at first view appear very extraordinary, that while the an- 
thracites experienced so remarkable an inerease of specific gravity by _ 
