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Water may percolate underground along this surface and loosen the cohesion between the upper and the underlying strata by converting the upper surface of a shale to soft wet clay, by dissolving layers of a limestone, or by removing the cement of a sandstone and converting it into loose sand. When the inclined surface is thus lubricated the overlying masses may be launched into the valley below.
About the middle of November it settled down in earnest and rained steadily for a month; sometimes it merely drizzled, at other times it poured; but it never stopped, except for an hour or so. The constant tramp of many feet speedily churned into mud the clay turf overlaying the chalk, and the rain could not percolate through this mixture as it did the unbroken sod.
It began to rise above the populace, and to percolate through higher ground. Amongst those who were fond of, and ran after, strange foreign curiosities and prodigies, it was known that there was somewhere in existence, leading a wandering life, now here, now there, an extraordinary monster. They talked about him, they sought him, they asked where he was.
It therefore appears that, although one ventricle of the heart, the left to wit, would suffice for the distribution of the blood over the body, and its eduction from the vena cava, as indeed is done in those creatures that have no lungs, nature, nevertheless, when she ordained that the same blood should also percolate the lungs, saw herself obliged to add the right ventricle, the pulse of which should force the blood from the vena cava through the lungs into the cavity of the left ventricle.
It is well ascertained that springs, whether hot or cold, charged with carbonic acid, especially with hydrofluoric acid, which is often present in small quantities, are powerful causes of decomposition and chemical reaction in rocks through which they percolate.
Even so, a great light was beginning to percolate to my innermost consciousness. A grave doubt pestered me through our days of camping there in the autumnal wilderness.
The Lundé forms a marsh on one side, and the Luapula lets water percolate through sand and mud, and so does the Robukwé, which makes the path often knee deep. He said he would send men to conduct me to Moero, a little further down, and added that we had got very little to eat from him, and he wanted to give more. Moero's south end is about 9° 30' S.
This water was found to be highly charged with carbonic acid holding lime in solution. It is well known that the waters of all springs are more or less charged with earthy, alkaline, or metallic ingredients derived from the rocks and mineral veins through which they percolate. Silex is especially abundant in hot springs, and carbonate of lime is almost always present in greater or less quantity.
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