vifit it, by rendering them every civility in
his power.
Here is found that Angular variety of
lead ore, called Jlickenfide. This galena
prefents a fmooth furfaee, as if plated.
Sorrietimes it forms the Tides of cavities,* <
and on being pierced with the miners tool,
rends with violence, and explodes with a
crackling noife. The caufe of this phenomenon
has not been fully explained. I
have Teen a man, when he came out of the
mine, only a few minutes after the ex-
plofion, who, regardlefs of the danger, had
pierced the Tides of this fiibftance, and was
much hurt, and cut violently, as if ftabbed
about the neck and other' places with a
chifel, whence he was unable to return to
the mines for two weeks.
The fedtion under the letter L reprefents
part of a" mountain, called the Long Cliff,
forming awful rock fcenery along the road
to
to Manchefter. This mountain is chiefly
of limeftone j and that marked B has every -
appearance of having been feparated from
it. Here is the Speedwell, or navigation
mine, driven north arid fouth, as at S, to
cut acrofs the veins of ore, which^ generally
run eaft and weft. It has not proved
fuccefsful though excavated for half a mile,
and connected with Ammenfe openings, as
at V. Its waters are colledted, and boats
float from the entrance to the Forejield.
In this mountain are feveral fmall rake
veins, containing lead ore, barytes^ fluor,
carbonates of lime, pyrites, rofe-coloured
calcareous fpar, blende, &c. X is a rake
vein running nearly fouth eaft by eaft, and
north weft by w eft; it is called Little Win-
fter, and there are feveral fhafts on it, which
are above twenty fathoms deep. N reprefents
Long Cliff rakes, on which there are a. few
fhafts.
e H reprefents