this crater there has been no eruption since 1706, when the finest
harbour in the island was destroyed. But from the side of the peak
there rises a supplementary mountain named Chahorra, on the top of
which there is also a crater, whence there was an eruption in 1798.
So great was its violence, that masses of rock were thrown to a
height of upwards of 3000 feet. In the neighbouring island of Palma
there is a volcanic crater named the Great Caldera, whose depth is
said to be upwards of 5000 feet.

Almost due east of Palma, and much nearer the African coast, lies
the Island of Lancerote, on which are a great many volcanic cones,
arranged nearly in a straight line. These were for the most part
formed by a long series of eruptions which took place during the
years from 1730 to 1736. Such immense quantities of lava were
poured forth in the course of those six years, that about a third
of the surface of the island was covered by them, and many towns
and villages were destroyed. St. Catalina, a populous and thriving
town, was first overflowed by a lava-stream, and then a new crater
burst forth on its very site, raising over it a hill 400 feet high.
All the cattle in the island fell down dead in one day, and nearly
about the same time--they were suffocated by deadly vapours that
rose from the ground. The volcanic activity of this island was
renewed in August 1824, when there was formed, near the port of
Rescif, a new crater, which vomited forth such quantities of
stones, ashes, and other volcanic matters, that in the short space
of twenty-four hours they formed a hill of considerable height.

The Cape de Verde Islands, lying to the south-westward of the
Canaries, are also volcanic. In 1847 a volcano named Fuego,
situated in one of them, after remaining at rest about fifty years,