". . . Will these trees, That have outlived the eagle, page thy steps And skip, when thou point'st out?" {p. 27} But if the point of elevation was whisked away from east to west, how could an ice-sheet a mile thick instantaneously adapt itself to the change? For all these markings took place in the interval between the time when the external force, whatever it was, struck the rocks, and the time when a sufficient body of "till" had been laid down to shield the rocks and prevent further wear and tear. Neither is it possible to suppose an ice-sheet, a mile in thickness, moving in two diametrically opposite directions at the same time. Again: the ice-sheet theory requires an elevation in the north and a descent southwardly; and it is this descent southwardly which is supposed to have given the momentum and movement by which the weight of the superincumbent mass of ice tore up, plowed up, ground up, and smashed up the face of the surface-rocks, and thus formed the Drift and made the _striæ_. But, unfortunately, when we come to apply this theory to the facts, we find that it is the _north_ sides of the hills and mountains that are striated, while the _south sides have gone scot-free!_ Surely, if weight and motion made the Drift, then the groovings, caused by weight and motion, must have been more distinct upon a declivity than upon an ascent. The school-boy toils patiently and slowly up the hill with his sled, but when he descends he comes down with railroad-speed, scattering the snow before him in all directions. But here we have a school-boy that tears and scatters things going _up_-hill, and sneaks down-hill snail-fashion. "Professor Hitchcock remarks, that Mount Monadnock, New Hampshire, 3,250 feet high, is scarified from top to bottom on its northern side and western side, but not on, the southern."[1] This state of things is universal in North America. [1. Dana's "Manual of Geology," p. 537.] {p. 28} But let us look at another point: If the vast deposits of sand, gravel, clay, and bowlders, which are found in Europe and America, were placed there by a great continental ice-sheet, reaching down from the north pole to latitude 35° or 40°; if it was the ice that tore and scraped up the face of the rocks and rolled the stones and striated them, and left them in great sheets and heaps all over the land--then it follows, as a matter of course, that in all the regions equally near the pole, and equally cold in climate, the ice must have formed a similar sheet, and in like manner have torn up the rocks and ground them into gravel and clay. This conclusion is irresistible. If the cold of the north caused the ice, and the ice caused the Drift, then in all the cold north-lands there must have been ice, and consequently there ought to have been Drift. If we can find, therefore, any extensive cold region of the earth where the Drift is not, then we can not escape the conclusion that the cold and the ice did not make the Drift.