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Updated: May 11, 2025
In the Little Cumbray, one of the Western Islands, near Arran, the amygdaloid sometimes contains elongated cavities filled with brown spar; and when the nodules have been washed out, the interior of the cavities is glazed with the vitreous varnish so characteristic of the pores of slaggy lavas.
A sheet of ancient lava may be distinguished by its composition from the sediments among which it is imbedded. The direction of its flow lines may be noted. The cellular and slaggy surface where the pasty lava was distended by escaping steam is recognized by the amygdules which now fill the ancient steam blebs.
The almost entire absence of associated grasses, which forms so remarkable a feature in the vegetation of this island, may perhaps be accounted for by the land having been aboriginally covered with forest-trees. The soil is volcanic; in several parts we passed over slaggy lavas, and craters could clearly be distinguished on several of the neighbouring hills.
Professor Judd says: "The most interesting fact with regard to the constitution of these Hungarian lavas, which in the central parts of their masses are often found to assume a very coarsely crystalline and almost granitic character, while their outer portions present a strikingly scoriaceous or slaggy appearance, remains to be noticed.
Soundings in the sea surrounding the island show that the bottom gradually shelves around the shores to a depth of nearly 600 fathoms, so that Stromboli is a great conical mass of cinders and slaggy materials, having a height above its floor of about 6600 feet, and a base the diameter of which exceeds four miles.
He had, without explanation, the impression of a slaggy cliff and on it, in silhouette against menacing clouds, a lone and austere figure. He was dismayed by a sudden contempt for his surest friends. He grasped Louetta Swanson's hand, and found the comfort of human warmth. Habit came, a veteran warrior; and he shook himself. "What the deuce is the matter with me, this evening?"
The clergyman led them along the side to avoid the bodies which were littered thickly down the bottom of the khor. It was hard walking over the shingly, slaggy stones, but they made their way to the summit at last. Beneath them lay the vast expanse of the rolling desert, and in the foreground such a scene as none of them are ever likely to forget.
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