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Updated: June 24, 2025
It is clear that water percolating such strata may soon remove the calcareous matter of the shell; and unless circumstances cause the carbonate of lime to be again deposited, the grains of sand will not be cemented together; in which case no memorial of the fossil will remain.
They tell me this is caused by the rain percolating through the dead leaves on the surface of the ground far above, and thus the water becomes saturated with carbonic acid gas, and so dissolves the limestone until the granite is reached, and the granite forms the bed of these underground rivers.
"Well, Dick," exclaimed Grosvenor, as the door was closed upon them and they looked round them in the dim light percolating through the long, narrow aperture in the wall which afforded their only supply of air and illumination, "what is your present opinion of things in general?"
Maybe thar's more of 'em." He pulled a few bricks out of the jamb, and raked the hollow space inside with his hand, and brought forth a steel purse of English manufacture, filled with shillings at one end, and fifteen golden guineas at the other; they rolled out through the decayed filigree, rusted, probably, by the rain percolating through the chimney, and the purse crumbled to iron-mould in his hand.
Had he been asked to state how he felt, he would merely have said that he was having a good time; for he was unaware in his self-consciousness of the potent charm of nature that was percolating through his city-rotted body and brain potent, in that he came of an abysmal past of wilderness dwellers, while he was himself coated with but the thinnest rind of crowded civilization.
Every timber in the structure seemed to keep pace with that resistless shaking as the tables slid to and fro, dripping from the water percolating at their heads, to distribute the fine silt of crushed, muddy ore evenly over the plates in the steady downward slant. Already the bright plates of copper, coated with quicksilver, were catching, retaining, amalgamating the gold.
This experiment explains how it is that water percolating through or running over limestone strata dissolves out the insoluble chalk. Such water, hard from dissolved carbonate of lime, can be softened by merely boiling the water, for the excess of carbonic acid is then expelled, and the chalk is precipitated again.
I have had occasion to work out the nature of fossil remains, of which there was nothing left except casts of the bones, the solid material of the skeleton having been dissolved out by percolating water.
"T minus one and counting...." Bessie continued officially. "Fifty, forty, thirty, twenty...." The faint whine of high-speed centrifugal compressors could be heard through the ship. "Ten...." The jets that had previously bubbled almost inaudibly took on the sound of a percolating coffee pot. "... Four, three, two, one, mark."
"It would be better, I think, if we were in a more sheltered position before it begins. Ha! there it comes though, in earnest." A smart shower began to fall as he spoke, and, percolating through the old roof, descended rather copiously on the mud floor. In a few minutes there was a heaving of the ground under their feet!
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