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Updated: May 5, 2025
They who have visited Switzerland are aware that every torrent which issues from an icy cavern at the extremity of a glacier is densely charged with an impalpable powder, produced by the grinding action to which the subjacent floor of rock and the stones and sand frozen into the ice are exposed in the manner before described.
A correct account of the associated flint tools and of their position was given in 1847 by M. Boucher de Perthes in his work above cited, and they were stated to occur at various depths, often 20 or 30 feet from the surface, in sand and gravel, especially in those strata which were nearly in contact with the subjacent white Chalk.
The land is wholly in the hands of individuals, and, in a climate sufficiently moist, would answer well for cultivation. The road passes near Prospect Hill, which is the most conspicuous eminence in the county, and is cultivated to the summit. The rich red soil derived from the subjacent trap-rock produces crops as abundantly now as when it was first tilled, upwards of thirty years ago.
Such masses, when they run aground on the bottom of the sea, must exert a prodigious mechanical power, and may polish and groove the subjacent rocks after the manner of glaciers on the land. Hence there will often be no small difficulty in distinguishing between the effects of the submarine and supramarine agency of ice.
They were, indeed, in some concern of mind, scanning every fold of the subjacent forest, and betraying both anger and dismay in their impatient gestures. 'I do not see him, Kuno, said the first huntsman, 'nowhere not a trace, not a hair of the mare's tail! No, sir, he's off; broke cover and got away. Why, for twopence I would hunt him with the dogs!
Ulceration and Necrosis of Cartilage. The synovial tissue covering the cartilage causes pitting and perforation of the cartilage and makes its way through it, and often spreads widely between it and the subjacent bone; the cartilage may be detached in portions of considerable size. It may be similarly ulcerated or detached as a result of disease in the bone. Caries of Articular Surfaces.
So it is with the habitable surface of our globe, in its relation to large masses of rock immediately below; it may continue the same for ages, while subjacent materials, at a great depth, are passing from a solid to a fluid state, and then reconsolidating, so as to acquire a new texture.
This sheet of land-ice sliding down to lower levels, ground down and polished the subjacent rocks, sweeping off nearly all superficial deposits of older date, and leaving only till and boulders in their place. To this continental state succeeded a period of depression and partial submergence.
The work was more than unhealthy; it was dangerous. It is true that they had four months and a half of rain, and three floods of the Seine. The fontis which Jean Valjean had encountered was caused by the downpour of the preceding day. The pavement, badly sustained by the subjacent sand, had given way and had produced a stoppage of the water. Infiltration had taken place, a slip had followed.
The excavations in the Montesquieu-Avantes Cave, about six miles from Saint-Girons, have brought to light a hearth covered over with a layer of stalagmite; numerous fragments of human bones, crania, femora, tibiae, humeri, and radii were found in this layer, and in that of the subjacent clay. In many cases the medullary orifice had been enlarged to make it easier to get out the marrow.
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