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