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Volcanic Mountains: Ottaiano

Nothing could be more dismal than the appearance of Ottaiano after this eruption. Many of the houses were unroofed, and some lay half buried under the black scoriæ and ashes; all the windows toward the mountain were broken, and some of the houses themselves burnt; the streets were choked up with ashes, and in some narrow places it was not less than four feet deep. A few of the inhabitants, who had just returned were employed in clearing them away, and piling them up in hillocks, to get at their ruined houses.

The palace of the prince of Ottaiano is situated on an eminence above the town, and nearer the mountain. The steps leading up to it were deeply covered with volcanic matter; the roof was totally destroyed, and the windows broken; but the house itself being strongly built, had not suffered much dilapidation.

An incredible number of fragments of lava were thrown out during the eruption, some of which were of immense magnitude. The largest measured by Sir William Hamilton was 108 feet in circumference, and seventeen in height: this was thrown at least a quarter of a mile clear of the mouth of the volcano. Another, sixty-six feet in circumference, and nineteen in height, being nearly of a spherical figure, was thrown out at the same time, and fell near the former: this last had all the marks of being rounded, nay, almost polished, by continual exposure to rolling torrents, or the still rougher beat of a sea-shore. Our author conjectures that it might be a spherical volcanic salt, such as that of forty-five feet in circumference mentioned by M. de St. Fond, in his Treatise on Extinguished Volcanoes. A third, of sixteen feet in height, and ninety-two in circumference, was carried much farther, and lay in the valley between Vesuvius and the Hermitage: it appeared, also, from the large fragments that surrounded this mass, that it had been much larger while in the air.

Vesuvius continued to emit smoke for a considerable time after this great eruption, so that our author was apprehensive that another would soon ensue; but from that time nothing comparable to the above has taken place. From the period of this great eruption, to 1786, our informant kept an exact diary of the operations of Vesuvius, with drawings; which shewed, by the comparative quantity of smoke emitted each time, the degree of fermentation within the volcano. The operations of these subterraneous fires, however, appear to be very capricious and uncertain: one day there will be the appearance of a violent fermentation, and the next every thing will be calmed; but whenever there has been a considerable ejection of scoriæ and cinders, it has been constantly observed, that the lava soon made its appearance, either by boiling over the crater, or forcing its way through the crevices in the conical part of the mountain.