560 Anthracite Coal of Rhode-Istand. 
choidal. A similar fracture is sometimes observed rannmg 
in a diagonal direction through these small solids. 
It is not improbable that in exploring for this anthracite, it 
will be fonnd, that the masses which come from the greatest 
depth, far removed from the action of meteoric causes, will 
be found to be more firm and compact than any hitherto dis- 
covered.* 
Componitior: 00 grains eo. from 90 to 94 grains of 
carbon, the fea beng iron an (Me ade.) 
100 grains ie cubis 90. 
water 
aides of iron and 
manganese 2.50 
43 
100 
{n another specimen, 
100 grains afforded — 77.70 
6.70 
ex 8.50 
oxides of iron and 
manganese 7.10 
alumine, a frace 
ph £ hes 
_(Vanuxem.) 
The ashes are fot more abundant than in the Pelaesioe 
nia anthracites. They a are of a reddish brown colour, and 
sopeacty talon magnet. A true furnace slag is 
the combustion, and req to be remov 
ulres ed, as 
it impedes the draft. This slag is principally of a shining 
black colour—it is partly compact and partly cavernous, and 
masses as large as a pea are instantly lifted by the magnet. 
The powder of the coal before combustion is not magnetic. 
“It is very curious, tha g the structure 
i out, the Rhode-Isiand thon is ee ter hard to sexi pe terer 
t ng about two » each 
way, resisted the heavy blows from the the head of an axe; i it was  penbe a 
to sever the pieces, by using the edge of this instrumen 
becam 
cessary to apply stout iron wedges, driven by a rot “i ie difficult also t0 
the smaller pieces, with the poker; when th re ignited in in the fur- 
