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Updated: June 24, 2025
All about him firelights are gleaming, happy families are gathered before the hearthstone, and through the windows the evening yodel may be heard percolating pleasantly. There is every inducement for the youth to drop in and rest his poor, tired, foolish face and hands and thaw out his knee joints and give the maiden a chance to make good on that proposition of hers.
Certainly highly heated solutions forced by an irresistible vis a tergo through rocks of any kind down in the heated zone, would be far more effective leaching agents than cold surface water with feeble solvent power, moved only by gravity, percolating slowly through superficial strata.
The catacombs, abandoned as residences on the construction of the cells above ground, have not escaped disasters by caving in. Drains to carry off the percolating water, and stone arches to support the soil, have been constructed, and a flourishing orchard has been planted above them to aid in holding the soil together.
Many faults have become filled with crystalline minerals in the form of veins of ore, deposited by infiltrating waters percolating through the natural fissures. In considering the formation and structure of the better-known coal-bearing beds of the carboniferous age, we must not lose sight of the fact that important beds of coal also occur in strata of much more recent date.
Moreover, in the fresh-water rotten-stone beds of Bilin, Ehrenberg had traced out the metamorphosis, effected apparently by the action of percolating water, of the primitively loose and friable deposit of organized particles, in which the silex exists in the hydrated or soluble condition.
He turned back into the house, a vague notion of what had befallen percolating feebly through his bewilderment. 'I dunno I dunno, he faltered, rubbing his ear. His mouth was dry, and he moved his lips uneasily, as he gazed with aimless looks about the walls and ceiling. Presently his eyes rested on the child, and 'Milly, he said decisively, 'come an 'ave yer face washed.
When viewing the spot, I imagined that the injection of a large mass of rock. like the cone of phonolite at Fernando Noronha, in a semi-fluid state, by arching the surface might have caused a wedge-shaped hollow with cracks at the bottom, and that the rain- water percolating to the neighbourhood of the heated mass, would during many succeeding years be driven back in the form of steam.
The floor of the cave gradually rises by the accumulation of sand and travertine, and with it rise the walls and floor of the cup by the deposit of successive layers of stalagmite produced by the drop percolating into the limestone of the floor which hardens it still further, but in this peculiar symmetrical way.
"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 root descended rather copiously on the mud floor. In a few minutes there was a heaving of the ground under their feet!
When the percolating acidulated water passes slowly through a pure limestone it is filtered of impurities and deposits a crystal, either pure white or transparent; if it comes in contact with metallic bodies of any kind, it carries away more or less in solution to act as coloring matter; the beautiful pale green onyx in several Missouri counties taking its tint from the copper; in South Dakota, manganese in various combinations produces black and many shades of brown; in both states an excessive flow of water often carries a quantity of red or yellow clay which temporarily destroys the beauty of exposed surfaces, but in after years becomes a fine band of brilliant color.
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