difcovery. It is generally found between the
ftratum of.fhiftus and the limeftone, rarely
in fmall cavities adhering to the gangart,
and fometimes containing lead ore, fluor, See.
Whenfirft detached thetafte is very ftyptic,
as if blended with decompofed pyrites. It
varies in colour from the blackifh or greenifh
brown to the light red brown, and is eafily
comprefled ; but fometimes the fame piece
is lefs elaftic in one part than in another.
On burning it the fmell is rather pleafant.
A piece of the elaftic bitumen, of a red-
dilh brown colour, now before me, contains
nodules of indurated fhining black
bitumen, refembling jet. This kind is very
rare.
Another variety, the only piece I have
feen, is in a marinejhell, in a piece of limeftone.
The elaftic bitumen of a dull red, and
tranfparent,
tranfparent, in cryftallized fluor, extremely
rare.
A variety, yet more fcarce, but lefs elaftic,
appears to be compofed of filaments, and
has a fingular acid tafte. The charadterif-
tics are very different from any other fort;
and might probably, if inveftigated, account
for the origin of this fubftance. On cutting,
and in other circumftances, it refembles foft
cawk, or old bark from a tan-yard.
Indurated bitumen, appearing like jet,
in amorphous mafles, and globules of a
lhining black, but fometimes liver-coloured.
This kind is eledtric when rubbed; and is
fometimes found in barytes.
Elaftic bitumen with afphalt, containing
lead ore. The fame in long filaments,
almoft as fine' as wire.
Sulphur (native) in the" cellular parts of
barofelenite on limeftone.
That