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Daubeny of decomposition of trachytic rocks by sulphureted hydrogen and muriatic acid gases in the Solfatara, near Naples. In all these instances it is clear that the gaseous fluids must have made their way through vast thicknesses of porous or fissured rocks, and their modifying influence may spread through the crust for thousands of yards in thickness.
M. de Chateaubriand does not agree with those who conclude it to be the crater of a volcano; for, having seen Vesuvius, Solfatara, the Peak of the Azores, and the extinguished volcanoes of Auvergne, he remarked in all of them the same characters; that is to say, mountains excavated in the form of a tunnel, lava, and ashes, which exhibited incontestable proof of the agency of fire.
Along the base of the volcano lie the towns of Portici, Annunziata, and Torre del Greco, everything glittering in the light of the rising sun. The eyes cannot rest upon a spot which has not its classic association, turn which way we will. In the distance eastward is seen Castellamare and Sorrento on the right curve of the crescent-shaped shore, while on the left lie Solfatara and Pozzuoli.
All around sulphurous fumes issue from crevices in the rocks, and in one special place the Solfatara reveals its subterranean activity by the emergence of fine, many-coloured sand, which oozes up like boiling liquid from the depths below. The whole region gives the impression of being in a state of labile balance.
The Anio or Teverone, which almost approaches in beauty to the Velino in the number and variety of its falls and cascatelle, is likewise a calcareous water; and there is still a more remarkable one which empties itself into this river below Tivoli, and which you have probably seen in your excursions in the campagna of Rome, called the lacus Albula or the lake of the Solfatara."
The road now went downwards between large banks, formed by the dross deposited here from the smelting furnaces, and which looks like burnt-out hardened lava. No sprout or shrub was to be seen, not a blade of grass peeped forth by the way-side, not a bird flew past, but a strong sulphurous smell, as from among the craters in Solfatara, filled the air.
The night was passed in a ruined shed at the south-east of the lake Malaksan; and on the following morning we climbed the south side of the mountain ridge and, skirting the solfatara of the Danan, arrived in an hour and a half at lake Jaruanan.
Every one of course visits the Solfatara, that curious semi-extinct crater, the Forum Vulcani of Strabo, which has remained for over seven hundred years in its present condition of languor.
Lucia, a very active solfatara, named Oualibou, two or three hundred toises high; jets of hot water, by which small basins are periodically filled. Martinique, three great extinguished volcanoes; Vauclin, the Paps of Carbet, which are perhaps the most elevated summits of the smaller islands, and Montagne Pelee. Thermal waters of Precheur and Lameutin. Dominica, completely volcanic.
Supposing these particulars to be correct, we must next ascertain what proportion of these changes of level is due to the floods, and how much to volcanic elevation; which, if we may judge by the neighboring active solfatara at Leyte, must always be of considerable amount.
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