These important and involved relations can only be explained by
very accurate crystallographic and chemical investigations. My
fellow-traveler in Siberia, Gustav Rose, and subsequently Hermann Abich,
have already been able, by their fortunate and ingenious researches, to
throw much light on the structural relations of the various kinds of
volcanic rocks.
p 235
The greater part of the ascending vapor is mere steam. When condensed, this
forms springs, as in Pantellaria,Iwhere they are used by the goatherds of
the island.
[footnote] *[Steam issues from many parts of this insular mountain, and
several hot springs gush forth from it, which form together a lake 6000 feet
in circumference. Daubeney, op. cit.] -- Tr.
On the morning of the 26th of October, 1822, a current was seen to flow from
a lateral fissure of the crater of Vesuvius, and was loong supposed to have
been boiling water; it was, however, shown, by Monticelli's accurate
investigations, to consist of dry ashes, which fell like sand, and of lava
pulverized by friction. The ashes, which sometimes darken the air for hours
and days together, and produce great injury to the vineyards and olive
groves by adhering to the leaves, indicate by their columnar ascent,
impelled by vapors, the termination of every great eqrthquake.
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