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Are their lungs, muscles, and nervous systems so constructed as to be adapted to a dry, rare, crisp atmosphere, which would prove injurious, perhaps fatal, to birds of a different structural organization? Who can tell? At all events, they live on these towering elevations all summer long, woo their plainly-clad mates, build their nests, and rear their happy families.
I have enlarged my notions , though not being able to see the movements, and having not time to peep closely, I know less than I might. I was less weary, and had better breath, as I walked farther. Ruthin Castle is still a very noble ruin; all the walls still remain, so that a compleat platform, and elevations, not very imperfect, may be taken. It encloses a square of about thirty yards.
But in the Silurian age, when there were no elevations higher than the Canadian hills, when water covered the face of the earth, with the exception of a few isolated portions lifted above the almost universal ocean, how monotonous must have been the conditions of life! And what should we expect to find on those first shores?
A delicate cleft, not very clearly traceable as a whole, begins near its N. end, and terminates amid the ramifications of the Apennines S. of Marco Polo. TAQUET. A conspicuous little crater on the S. border of the Mare Serenitatis at the foot of the Haemus Mountains. A branch of the great Serpentine ridge, which traverses the W. side of this plain and other lesser elevations, runs towards it.
I can also employ certain instruments, invented by man, to measure heights, suppose of a tower, and, by experiments made in ways independent of these instruments, verify or otherwise the report of these instruments. The height of the Monument of London is something more than two hundred feet. Other elevations, the produce of human labour, are considerably higher.
Her usual walk was over the cliffs toward the bay, where, from some of the elevations near Russian Hill, she could look out to the Golden Gate, or across to Tamalpais or the Contra Costa shores.
To enable the vulture to accomplish the work assigned him, he is endowed with an inconceivable strength of wing, to sustain his flight over the vast distances which he has to traverse, and up to the vast elevations to which he must sometimes soar; and also with some mysterious and extraordinary sense, whether of sight or smell, to enable him readily to find, at any hour, the spot where his presence is required, however remote or however hidden it may be.
While the coral reefs and islands of the Pacific may be recognised by their slight elevation above the surface of the waters, those of volcanic origin and containing active or extinct craters of eruption generally rise into lofty elevations, so that the two kinds are called the Low Islands and High Islands respectively.
For the more extended climbs or for excursions in the direction of the Schwarzsee, the Staffel Alp or the Trift, Zermatt is the starting point. The place abounds in walks, most of them being the first part of the routes to the high mountains, so that those who are fond of tramping but not of climbing can reach high elevations with a little hard work, but no great difficulty.
Subsequently, with fresh elevation, a new cycle is commenced. So much for the simple case, but in fact nearly all cases are modified by unequal elevations due to landslips, by variation in hardness of rock, &c. Hence modification in positions of river courses and the fact of different parts of a single river being in different stages of cycle.
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