Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 1 - By Alexander Von Humboldt And Aime Bonpland.
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It Is Contained In The Narrative Of The Voyage
Of Aloysio Cadamusto, Who Landed At The Canaries In 1505.
This
traveller was witness of no eruptions, but he positively affirms
that, like Etna, this mountain burns without interruption, and that
the fire has been seen by christians held in slavery by the
Guanches of Teneriffe.
The Peak, therefore, was not at that time in
the state of repose in which we find it at present; for it is
certain that no navigator or inhabitant of Teneriffe has seen issue
from the mouth of the Peak, I will not say flames, but even any
smoke visible at a distance. It would be well, perhaps, were the
funnel of the Caldera to open anew; the lateral eruptions would
thereby be rendered less violent, and the whole group of islands
would be less endangered by earthquakes.
The eruptions of the Peak have been very rare for two centuries
past, and these long intervals appear to characterize volcanoes
highly elevated. The smallest one of all, Stromboli, is almost
always burning. At Vesuvius, the eruptions are rarer than formerly,
though still more frequent than those of Etna and the Peak of
Teneriffe. The colossal summits of the Andes, Cotopaxi and
Tungurahua, scarcely have an eruption once in a century. We may
say, that in active volcanoes the frequency of the eruptions is in
the inverse ratio of the height and the mass. The Peak also had
seemed extinguished during ninety-two years, when, in 1798, it made
its last eruption by a lateral opening formed in the mountain of
Chahorra.
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