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Updated: June 22, 2025
The dangerous look upon his face was succeeded by a glacial calm, which lasted through luncheon, of which he ate nothing. Jack did his best to bring an atmosphere of unconcern but failed and we got up from the table aware of impending trouble. Then Jerry disappeared.
Those who ride into Rubicon Springs from McKinney's, just as they make the last descent, have a wonderful view of Georgetown Mountain before them. Its sloping side is glacially planed off at a steep angle, and it reveals the vast extent the great ice field must have covered in the days of glacial activity. Many bowlders near the Springs are very strongly marked by glacial action.
Another series of observations made by Captain Graah, during a survey of Greenland between 1823 and 1829, and by Dr. Pingel in 1830-32, adds not a little to the geological interest of the "outskirts," in their bearing on glacial phenomena of ancient date. Those Danish investigators, with one of whom, Dr.
Furthermore, because it is distributed along the lower portion of the range, which was the first to be left bare on the breaking up of the ice-sheet at the close of the glacial winter, the soil it is growing upon has been longer exposed to post-glacial weathering, and consequently is in a more crumbling, decayed condition than the fresher soils farther up the range, and therefore offers a less secure anchorage for the roots.
Many such masses must have stranded along the shore, and have left various signs of their presence. In fact, the glacial phenomena of the United States and elsewhere are due to two distinct periods: the first of these was the glacial epoch proper, when the ice was a solid sheet; while to the second belongs the breaking up of this epoch, with the gradual disintegration and dispersion of the ice.
So far as can be positively ascertained, all the authentic relics of man belong to the Glacial Age. They seem first to become numerous in the interglacial period, and continue to increase and become diversified as we descend lower in time. How long ago it was that the sea of ice began its downflow over the earth it is impossible to say.
But the foregoing remarks on distribution apply not only to strictly arctic forms, but also to many sub-arctic and to some few northern temperate forms, for some of these are the same on the lower mountains and on the plains of North America and Europe; and it may be reasonably asked how I account for the necessary degree of uniformity of the sub-arctic and northern temperate forms round the world, at the commencement of the Glacial period.
But above all in educational importance I rank the advantage of seeing human nature in its primitive surroundings, far from the squalid and chilly influences of the tail-end of the Glacial epoch. I admit at once that cold has done much, exceeding much, for human development has been the mother of civilisation in somewhat the same sense that necessity has been the mother of invention.
The glacial developments of these superb ranges are sharply sculptured peaks and crests, with ample wombs between them where the ancient snows of the glacial period were collected and transformed into ice, and ranks of profound shadowy canyons, while moraines commensurate with the lofty fountains extend into the valleys, forming far the grandest series of glacial monuments I have yet seen this side of the Sierra.
So with the new growths of timber springing up in the paths of tornadoes, over large burnt districts, in soils brought up from below the last glacial drift, and in hundreds of other instances which the reader will find conclusively verified in these pages, all making their appearance without the possible intervention of natural seeds.
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