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Metallic substances are also thus found in some proportion to the disposition of the particular metals, to resist the mineralising operations, and to their facility of being metallised by fire and fusion. Gold, which refuses to be mineralised with sulphur, is found generally in its native state. Iron, again, which is so easily mineralised and scorified, is seldom found in its malleable state.
Fixed in the crevices of volcanic rocks, they form, as it were, that first layer of vegetable earth with which the currents of lithoid lava are clothed. Wherever these lavas are scorified, and where they have a shining surface, as in the basaltic mounds to the north of Lancerota, the development of vegetation is extremely slow, and many ages may pass away before shrubs can take root.
His beard an' hyar wuz all nyawed off, an' his face an' han's an' neck wuz scorified terrible. Well, he jes' laid Ham Fisher down, an' then he kind o' staggered for'ad, an' ole missis ketch' 'im in her arms. Ham Fisher, he warn' bu'nt so bad, an' he got out in a month to two; an' arfter a long time, ole marster he got well, too; but he wuz always stone blind arfter that.
Above a turf scorched by the heat of an African sun, an arid soil is overspread by the Cladonia paschalis. Towards the summit of the Peak the Urceolarea and other plants of the family of the lichens, help to work the decomposition of the scorified matter. By this unceasing action of organic force the empire of Flora is extended over islands ravaged by volcanoes.
His beard an' hyar wuz all nyawed off, an' his face an' han's an' neck wuz scorified terrible. Well, he jes' laid Ham Fisher down, an' then he kind o' staggered for'ad, an' ole missis ketch' 'im in her arms. Ham Fisher, he warnt bu'nt so bad, an' he got out in a month or two; an' arfter a long time, ole marster he got well, too; but he wuz always stone bline arfter dat.
The whole appearance of this interesting locality showed that the stream of lava was of much more recent date than the rock of the table land, and that the latter was probably formed under water, whilst the cellular scorified lava was poured out into the open air. The stream of lava enlarged so much, and descended into so broad a valley, that I considered it to be the head of the Burdekin.
Their summits, which are sometimes scorified, seem to prove that they have been exposed to a great degree of heat. The soil which covers the plateau, formed by the summit of the Basaltic columns, the sides of which assume towards the Mamelles, the appearance of walls of Trapp, but already, in a great degree, changed into tuf, is arid and covered with briars.
The flanks of the volcano are covered either with blocks of black and scorified lava, or with a luxuriant vegetation, the masses of which reflect the less light, as the leaves of the trees are separated from each other by shadows of more considerable extent than that of the part enlightened.
If the plants of Teneriffe do not reach the summit of the volcano, it is not because the perpetual snow and the cold of the surrounding atmosphere mark limits which they cannot pass; it is the scorified lava of the Malpays, the powdered and barren pumice-stone of the Piton, which impede the migration of plants towards the brink of the crater.
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