which neither emits fmoke nor flame, but
burns like charcoal. 6. Jet, which he fays
is found in England and other parts in detached
and feparate maffes; he then compares
the different kinds of coal with the
different kinds of wood, and points out
p. 254, the extraordinary appearance of
coal at Caftle Lead, in the eaft of Rofshire,
where it affumes the form of rake veins,
and as he afterwards explains in granite.
He alfo found coal in the ifle of Mull ;
he returns to fhew the abfurdity of fupport-
ing that petroleum and far lefs ochre, are
any indications of coal,
PART
P A R T II.
Mineral veins and other Bedsy and Repo->
' Jitories o f the precious and- ufeful Metals,
J H e divides mineral veins into four kinds,
I. rake, 2. pipe, 3. flat or dilated, 4. accumulated,
He obferves, p. 271, that the
vein at Strontian may be called a gafh,
and that it is in grey granite, in which
he is miftaken or inaccurate, faults too
common in this work, for it is in red
granite. In p, 274, he again returns to
Llangunog, and afterwards gives an account
of the lead mine at Daven Jaur in
Cardiganfhire, and of mineral veins on
the Scotifh fhores.
In