POMPEIANA. 67
of years, it cracks occasionally with loud
explosion K
The crater, as well as its internal
opening, assumes various forms, and is
acted upon by the casualties of the re-
spective eruptions. In 1766, we find the
inside containing a small plain or crust,
from the midst of which arose a smaller
cone. Of this the apex, gradually increas-
ing, at length became 200 feet higher
than the outer rim. The intermediate
hollow was afterwards filled with the
overflowing lava of succeeding eruptions ;
so that in 1779, we find the whole
strengthened sufficiently to contain that
material in fusion, which suddenly ejected
with violence and descending upon its
sides, added much to the strength of the
boundary.
The explosion of 1794 was attended
by the not unusual, on such occasions,
1 Sir W. Hamilton, three years after the eruption of
1767, fired a stick by thrusting it within one of the cre-
vices.
F 2
of years, it cracks occasionally with loud
explosion K
The crater, as well as its internal
opening, assumes various forms, and is
acted upon by the casualties of the re-
spective eruptions. In 1766, we find the
inside containing a small plain or crust,
from the midst of which arose a smaller
cone. Of this the apex, gradually increas-
ing, at length became 200 feet higher
than the outer rim. The intermediate
hollow was afterwards filled with the
overflowing lava of succeeding eruptions ;
so that in 1779, we find the whole
strengthened sufficiently to contain that
material in fusion, which suddenly ejected
with violence and descending upon its
sides, added much to the strength of the
boundary.
The explosion of 1794 was attended
by the not unusual, on such occasions,
1 Sir W. Hamilton, three years after the eruption of
1767, fired a stick by thrusting it within one of the cre-
vices.
F 2