Anthracite Coal of Pennsyleania. 333 
"Fhe differe ies It within a 
few ictus the he Schuylkill sale fectibs thé Lehibhcans 
in the earlier stages of the 8 Saegea the gas from — coal 
was the most abundant; soon however the gas came from 
both with apparently équal rapidity , the Schuylkill cea 
first, and that from the Lehigh continued to come over after 
the other had done, until the entire product of gas wa s nearly 
the same from both varieties of coal, but rather greater 
from the Lehigh. The Wilkesbarre coal much exceeded both 
ee in the abundance of gas which it afforded. The 
‘ise results will be — in a table farther yes slong 
with hose obtained from some other varieties. 
“most remarkable of titese was the Rhode Island an- 
chrelves From this I obtained no gas at all, although the ex- 
‘periment was condueted in the same manner with the others 
that have been related. The specimen of he was one that 
had lain several years in a garret, but 1 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 | presume that a spe~ 
cimen recently taken from the mines, would afford some 
The Wilkesbarre coal had however lain several years ina very 
upper room. I next tried a comparative experiment 
with good bituminous Liverpool coal, using the same quantity, 
and nee “Aeal in the same manner. I found the result such 
as Thad | s before obtained, from this species of coal. 
Phe | nmable eee was ad td and money obtained, 
but not much more so. from the Lehigh anthracite. It 
will be seen in the table hat it ae. but one twentieth part 
more gas than the Lehigh, ve aes bes —— as o> y peg 
ihracite of Wilkerbaties™ : 
== Sp. pa Wegition REI 1] 3 ) — he ae eee ae 
Authracite. |e | woe rig: by ignition,|}gas givenout} ~ ive: 
vali ignticn| “grains. “['wine pints. | *® 
Tehigh, = 87 aa } ia 259 19 | Seratch the hard- 
huylkill, 876) . 1,52 1,77 324} 18 est window glass 
ilkesbarre, 876) 1,55 | 1,77 170 40 readily. 
node Island, 8 B75" fp 100 0 do. do. 
— - 76} 193 | 065 | 336 3 
vi pie ABT: nis 0 do. do. * 
Leanets ie 3} eS — 352 40,75 {; do do. 
* It may at first view appear very extraordinary, that while ain 
thracites experienced so remarkable an increase of specific gravity by 
