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The skin, being richly supplied with nerves, is an important organ of sensibility and touch. In some parts it is closely attached to the structures beneath, while in others it is less firmly adherent and rests upon a variable amount of fatty tissue. It thus assists in relieving the abrupt projections and depressions of the general surface, and in giving roundness and symmetry to the entire body.
The great advantage arising from depressions and elevations of the soil, is not often brought home to the mind. The two miserable springs in the long passage between the Rio Negro and Colorado were caused by trifling inequalities in the plain, without them not a drop of water would have been found.
The depressions for the Pacchionian glands are deep and numerous; and there is an unusually deep vascular groove immediately behind the coronal suture, which, as it terminates in the foramen, no doubt transmitted a 'vena emissaria'. The course of the frontal suture is indicated externally by a slight ridge; and where it joins the coronal, this ridge rises into a small protuberance.
This went on for a week, and then the people were terrified at finding that water was pouring up through all the depressions of the land, cutting off the highlands from Pike's Peak with an arm of the sea. It was evident that the flood had been rapidly rising, and if it should rise but little higher they would be caught in a trap.
Lakes filled all depressions of the valleys before their waters dug out those permanent channels which, during a subsequent epoch, became our rivers. And wherever we explore, in Europe, Asia, or America, the shores of the literally numberless lakes of that period, whose proper name would be the Lacustrine period, we find traces of neolithic man.
Any geologist who knows how strata have been contorted and tilted up, and how elevations and depressions must often have occurred alternately, not once or twice only, but scores and even hundreds of times, will have no difficulty in admitting that such changes as have been here indicated, are not in themselves improbable.
The road is macadamized with white granite, and after one of those tremendous downpourings that occur every hour or so the wheel-worn depressions on either side become narrow streams, divided by the white central ridge. Down the long, straight slopes these twin rivulets course right merrily, the whirling wheels of the bicycle flinging the water up higher than my head.
The numerous toy villages, with tiny spires projecting out of them, were just as the children might have left them when done with play the day before; the forest tracts were diminished to cushions of moss; one or two big lakes were dwarfed to ponds, the smaller ones to puddles though they did not look like puddles, but like blue teardrops which had fallen and lodged in slight depressions, conformable to their shapes, among the moss-beds and the smooth levels of dainty green farm-land; the microscopic steamboats glided along, as in a city reservoir, taking a mighty time to cover the distance between ports which seemed only a yard apart; and the isthmus which separated two lakes looked as if one might stretch out on it and lie with both elbows in the water, yet we knew invisible wagons were toiling across it and finding the distance a tedious one.
Others he investigated by riding in a little way, sending a glance around and riding out again. Just before dusk, as he was returning disappointedly after looking as far as was practicable, his horse Sandy swung into one of the open-mouthed depressions of his own accord. Probably he had become convinced that they were hunting stock, and that every niche must be entered. Johnny did not say a word.
Even though there may be a trail already, you cannot be sure that it will continue; it is much safer to depend upon your own blazing. Often in trailing along the mountain you will find huge rocks and steep depressions, or small lakes which you cannot cross over but must go around, and in so doing change your direction, perhaps strike off at an angle.
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