A treatise on rocks, rock-weathering and soils

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Macmillan, 1906 - Petrology - 400 pages
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Page 387 - The earth is fast becoming an unfit home for its noblest inhabitant, and another era of equal human crime and human improvidence, and of like duration with that through which traces...
Page v - THE ruins of an older world are visible in the present structure of our planet ; and the strata which now compose our continents have been once beneath the sea, and were formed out of the waste of pre-existing continents.
Page 381 - In many parts of England a weight of more than ten tons of dry earth annually passes through their bodies and is brought to the surface on each acre of land; so that the whole superficial bed of vegetable mould passes through their bodies in the course of every few years.
Page 387 - There are parts of Asia Minor, of Northern Africa, of Greece, and even of Alpine Europe, where the operation of causes set in action by man has brought the face of the earth to a desolation almost as complete as that of the moon ; and though, within that brief space of time which we call
Page 387 - When the forest is gone, the great reservoir of moisture stored up in its vegetable mold is evaporated, and returns only in deluges of rain to wash away the parched dust into which that mold has been converted.
Page 52 - Air-castle — and they have a' their different turns, and some can clink verses, wi' their tale, as weel as Rob Burns or Allan Ramsay — and some rin up hill and down dale, knapping the chucky stanes to pieces wi...
Page 386 - The high road has been several times turned to avoid this cavity, the enlargement of which is still proceeding, and the old line of road may be seen to have held its course directly over what is now the widest part of the ravine. In the perpendicular walls of this great chasm appear beds of clay and sand, r.ed, white, yellow, and green, produced by the decomposition in situ of hornblendic gneiss, with layers and veins of quartz, as before-mentioned, and of a rock consisting of quartz and felspar,...
Page 302 - ... which root at the bottom of the basins or swamps and send up their stems and leaves to the surface of the water or above it, where their substance becomes in the sunshine hard and woody. As these plants periodically decay, their remains, of course, drop to the bottom of the water ; and each year the process is repeated, with a more or less marked variation in the species of the plants. After a time the basins become filled by these successive accumulations of years or even centuries, and then...
Page 190 - The finest silt, when treated with a diluted acid to remove the iron stains, shows the remaining granules of quartz, feldspar and epidote beautifully fresh and with sharp, angular borders, the mica being, however, almost completely decolorized and resembling sericite more than biotite.
Page 386 - ... from whence the excavating power worked backwards, till in the course of twenty years, a chasm measuring no less than 55 feet in depth, 300 yards in length, and varying in width from 20 to 180 feet, was the result.

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