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The workman runs the four cadinhes at once, this being easily enough done, since he has neither to bother himself with regulating the wind, which enters always with the same pressure, nor with the flow of the scoriae, which remain always at the bottom of the crucible.

The streams are separated from each other by beds of fragmentary brown scoriae, firmly cemented together, and including a few well-rounded pebbles of lava. From their general appearance, I suspect that these lava-streams flowed at an ancient period under the pressure of the sea, when the Atlantic covered the Pampas and washed the eastern foot of the Cordillera.

From the shortness of our visit, I did not examine these beds with care; some of them, especially those of the white, yellow, and brown shades, originally existed as streams of lava, but the greater number were probably ejected in the form of scoriae and ashes: other beds of a purple tint, porphyritic with crystal- shaped patches of a white, soft substance, which are now unctuous, and yield, like wax, a polished streak to the nail, seem once to have existed as solid claystone-porphyries: the red argillaceous beds generally have a brecciated structure, and no doubt have been formed by the decomposition of scoriae.

Primitive formations are nowhere seen above ground; we find only what belongs unquestionably to volcanoes: feldspar-lava, dolerite, basalt, conglomerated scoriae, tufa, and pumice-stone. Among the limestone formations we must distinguish those which are essentially subordinate to volcanic tufas* from those which appear to be the work of madrepores and other zoophytes.

When he came to himself after the disappearance of Kate, his heart was a wasted field of volcanic action, with ashes and scoriae of infernal blackness on the surface, but the wholesome soil beneath. In spite of her injunction, he set himself to look for her. More than love, more than pity, more than remorse prompted and supported him. She was necessary to his resurrection, to his new birth.

The road soon degenerated into a wood road, then into a bridle track, then into a mere trail ascending all the way; and at dawn, when the rain was over, we found ourselves more than half-way up the mountain, amidst rocks, scoriae, tussocks, ohelos, a few common compositae, and a few coarse ferns and woody plants, which became coarser and scantier the higher we went up, but never wholly ceased; for, at the very summit, 10,200 feet high, there are some tufts of grass, and stunted specimens of a common asplenium in clefts.

I suspect the plains of Patagonia, like those of Australia, are traversed by many watercourses, which only perform their proper parts at certain periods. Probably this is the case with the water which flows into the head of Port Desire, and likewise with the Rio Chupat, on the banks of which masses of highly cellular scoriae were found by the officers employed in the survey.

The ore is flung into the blast furnace, and the scum rises to the surface, and may be ladled off, and the pure stream, cleansed because it is heated, flows out without scoriae or ash. All that was 'fuel for the fire' is burned; and what remains is more truly itself and more precious.

Next day I was in the middle of the Black Country. I had no letters of introduction to employers in Wolverhampton; so that, without stopping there, I proceeded at once to Dudley. The Black Country is anything but picturesque. The earth seems to have been turned inside out. Its entrails are strewn about; nearly the entire surface of the ground is covered with cinder-heaps and mounds of scoriae.

But this question must be enlarged upon more fully in the chapters on Igneous Rocks, in which it will also be shown, that as different sedimentary formations, containing each their characteristic fossils, have been deposited at successive periods, so also volcanic sand and scoriae have been thrown out, and lavas have flowed over the land or bed of the sea, at many different epochs, or have been injected into fissures; so that the igneous as well as the aqueous rocks may be classed as a chronological series of monuments, throwing light on a succession of events in the history of the earth.