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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.
These shocks give rise to earthquake waves, and as the crushing of the walls of the fissure developes heat, we have here the vera causa both of volcanic eruptions and earthquake shocks the former intensified into explosions by access of water through the fissures. "On the Dynamics of Earthquakes," Trans. Roy. Irish Acad., vol. xxi. "Rep. on Theories of Elevation and Earthquakes," Brit. Ass.
Thus, volcanos will appear to be not a matter of accident, or as only happening in a particular place, they are general to the globe, so far as there is no place upon the earth that may not have an eruption of this kind; although it is by no means necessary for every place to have had those eruptions.
Redness, scurf, and eruptions were on almost every part. Apply the mange ointment and the alterative and physic balls. On the following day there was an ulcer on the centre of the cornea, with much appearance of pain and impatience of light. Apply an infusion of digitalis, with the liquor plumbi diacetatis.
Off the coast of Iceland islands have appeared during several of the volcanic eruptions which that remote dependency of Denmark has manifested, and at various periods in Iceland's history the sea has been covered with pumice and other debris, which tell their own tale of what has been going on, without being in sufficient quantity to reach the surface in the form of an island mass.
Before this it had borne the reputation of being extinct, but since then it has frequently shown that its fires have not burned out, and has on several occasions given a vigorous display of its powers. During the fifteen hundred years succeeding the destructive event described eruptions were of occasional occurrence, though of no great magnitude.
While sleeping on shore, the house we occupied was one night so shaken that we thought it would fall about our heads; but the inhabitants seemed to take it as a thing of course, and we heard that nearly every month an earthquake occurs. Several most disastrous eruptions of the mountain have taken place, causing great destruction of life and havoc among the plantations.
He lay sick with fever, and I went to him and took his hot hand gently in mine. I shall never forget his look of gratitude. And the next day he borrowed five dollars of me, shedding tears as he put it in his pocket. . . . . At Panama we lose several of our passengers, and among them three Peruvian ladies, who go to Lima, the city of volcanic eruptions and veiled black-eyed beauties.
Since then the condition and form of the mountain has remained very much the same, varied only by the results of occasional eruptions. Before leaving the subject we have been considering, it is necessary that I should mention one remarkable fact connected with the origin of the lavas of Etna and Vesuvius respectively; I refer to their essential differences in mineral composition.
During the heats of summer, some few persons of gross habits have, in consequence of violent exercise and excess, been seized with putrid fevers, attended with exanthemata, erisipelatous, and miliary eruptions, which commonly prove fatal: but the people in general are healthy, even those that take very little exercise: a strong presumption in favour of the climate!
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