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Updated: June 6, 2025
The soil was light and friable, and below lay a bed of silicious tufa; therefore, even without tools, the aperture deepened quickly. It soon became evident that a man, or men, clinging to the sides of the "pah," were cutting a passage into its exterior wall. What could be the object? Did they know of the existence of the prisoners, or was it some private enterprise that led to the undertaking?
The silicious coats of species only known living in the waters of the South Polar Ocean, have, during past ages, contributed to the formation of rocks; and thus they outlive several successive creations of organized beings.
Near to Babylonia the most common kind was limestone; but about Had-disah on the Euphrates there was also a gritty, silicious rock alternating with iron-stone, and in the Arabian Desert were sandstone and granite. Such stone as was used in Babylon itself, and in the other cities of the low country, probably either came down the Euphrates, or was brought by canals from the adjacent part of Arabia.
Moreover, in the case of freshwater deposits of this kind it is certain that the action of percolating water may convert the originally soft and friable, fine-grained sandstone into a dense, semi-transparent opaline stone, the silicious organized skeletons being dissolved, and the silex re-deposited in an amorphous state.
a very small village, nestled close in under the hillside, and overshadowed by the high bluffs which seem to threaten its existence, and would quite exterminate it should land-slides ever become possible with these silicious limestone battlements. Beyond being an outlet for surplus products of the back country, it has no importance and no attractions.
In accordance with the existing state of things, the Radiolaria and Diatoms would have a universal distribution, the latter gathering most thickly in the polar regions, while the Foraminifera would be largely, if not exclusively, confined to the intermediate zone; and, as a consequence of this distribution, a bed of "chalk" would begin to form in the intermediate zone, while caps of silicious rock would accumulate on the circumpolar regions.
The remains of those which have perished form great beds and strata in the crust of the earth. The silicious stone, called Tripoli, is entirely composed of such remains; at Bilin, in Bohemia, there is one stratum of this substance, fourteen feet thick, one cubic inch of which is estimated to contain forty-one thousand millions of individuals.
But the occasion justified our eagerness. A smooth silicious basin, seventy-two feet in diameter and four feet deep, with a hole at the bottom as in a washing-basin on board a steamer, stood before us brimful of water just upon the simmer; while up into the air above our heads rose a great column of vapour, looking as if it was going to turn into the Fisherman's Genie.
The base of some of the dunes in the Delta of the Nile is reached by the river during the annual inundation, and the infiltration of the water, which contains lime, has converted the lower strata into a silicious limestone, or rather a calcarous sandstone, and thus afforded an opportunity of studying the structure of that rock in a locality where its origin and mode of aggregation and solidification are known.
The southern ware is characterized by refinement of outline, color, finish and ornament, and is distinguished from that of the Middle Mississippi by its material, which is a fine-grained paste, tempered with very fine silicious matter instead of pulverized shells.
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