This is very remarkable in its volcanic formation. Its appearance on our approach is very singular, no entrance to the harbour being distinguishable until you are close to its mouth. The highest point of the island, or Mt. St Elias, is about 800 feet above the level of the sea, and is conical. The summit was formerly a place of observation for pilots, but now for pirates who infest the Archipelago. On the North side of the island, and about half a mile from it, are some basaltic rocks—very curious in appearance, without containing Zeolite. Upon ascending from the harbour to the town we pass over hills and rocks of lava, in which Opal is found, and pumice stone and sulphur, and beds of limestone which has been burnt but still retains many perfect shells which soon absorb moisture and fall to pieces on exposure to the air. In one part of a rock of sandstone, at about the middle of the entrance into the Port, are some singular catacombs in the perpendicular rock—some of them capable of containing four, six, or eight bodies; and they are also seen in the rock 10 or 20 feet below the level of the water. This then is a strong proof that the harbour was the crater of a volcano, as these tombs must have been formed before the grand eruption which gave access to the sea.