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On the ground of these differences we divide it into two principal sections; the lower Placentals or Indecidua, and the higher Placentals or Deciduata. They are only loosely connected with the mucous coat of the uterus, so that the whole foetal membrane with its villi can be easily withdrawn from the uterine depressions like a hand from a glove.
Now and then they crossed a shallow little creek, and occasionally they came to pools, some of which were tinged with alkali. There were numerous small depressions, two or three feet deep, and Dick knew that they were "buffalo wallows." He and Albert examined them with interest. "This is buffalo country again," said Dick. "Everything proves it.
"The general history of the world," he says, "ought to precede the special history of its productions; and the details of singular facts touching the life and habits of animals, or touching the culture and vegetation of plants, belong perhaps less to natural history than do the general results of the observations which have been made on the different materials which compose the terrestrial globe, on the elevations, the depressions, and the unevennesses of its form, on the movement of the seas, on the trending of mountains, on the position of quarries, on the rapidity and effects of the currents of the sea this is nature on the grand scale."
Still one cannot but experience a shock on seeing the plough driven through an ancient, smooth turf, curiously marked with barrows, lynchetts, and other mysterious mounds and depressions, where sheep have been pastured for a thousand years, without obscuring these chance hieroglyphs scored by men on the surface of the hills.
And when we continually come upon such little anomalies of distribution as that just now described, we find the only rational explanation of them, in those repeated elevations and depressions which have left their record in mysterious, but still intelligible characters on the face of organic nature.
There are also weedy patches, bare sand-banks of limited extent, uncovered at low water, and muddy depressions both in the deep and shallow portions and clean sand. Strong currents race past the sand-spit and across the bay, carrying, no doubt, continual supplies of spat from elsewhere to settle in quiet places.
Money will seldom be wasted which is spent in promoting kinds of knowledge, enterprise or research that bring no certain remuneration proportioned to their value; in assisting poor young men of ability and industry to develop their special talents; in encouraging in their many different forms thrift, self-help and co-operation; in alleviating the inevitable suffering that follows some great catastrophe on land or sea, or great transitions of industry, or great fluctuations and depressions in class prosperity; in giving the means of healthy recreation or ennobling pleasures to the denizens of a crowded town.
The boy had kept well down in the ravines and depressions, in order to screen himself from observation and possible pursuers. We, however, were not obliged to follow his tracks; Vic did that, and we took the general direction from her, cutting across turnings and windings, and making much better progress than the thief could have done.
These depressions in the plain generally have one side lower than the others, but there are no outlets for drainage. Under a less dry climate, an outlet would soon have been formed, and the salt washed away.
In addition to te above conventional signs, we have CONTOURS to show the elevations, depressions, slope, and shape of the ground. Abroad, HACHURES are much used, but they serve only to indicate elevation, and, as compared to contours, are of little value. They simply show slopes, and, when carefully drawn, show steeper slopes by heavier shading and gentler slopes by the fainter hachures.
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