I am unwilling to weary my readers by dwelling upon appearances identical with those already described; but I may state, for the guidance of those who wish to investigate these traces for themselves, that any recently uncovered ledge of rock in our neighborhood, the surface of which has not been altered by atmospheric agencies, presents the glacier-worn surfaces with the characteristic _striae_ and furrows. These marks may be traced everywhere, even to the sea-shore, not only down to the water's edge, but beneath it, where-ever the harder rocks have resisted the action of the tides and retain their original character. In our granitic regions intersected by innumerable trap dikes, as, for instance, at Nahant, the smooth surface of many of the rocks, where sienite and trap have been evenly levelled, shows that the same inexorable saw, cutting alike through hard and soft materials, has passed over them. In the hills of pudding-stone in the neighborhood of Roxbury, we have quartz pebbles cut down to the same level with the softer paste in which they lie imbedded with pebbles of sandstone, clay-slate, gneiss, and limestone. In the limestone regions of Western New York and Northern Ohio, about the neighborhood of Buffalo and Cleveland, the flat surfaces of the limestone are most uniformly polished, furrowed, and scratched, the furrows often exhibiting that _staccato_ grating action described in a former article. I have observed the same traces in the vicinity of Milwaukee and Iowa City, and we know, from the accounts given by Arctic travellers of their overland expeditions, that these peculiar appearances of the surface are characteristic of the rocks in those regions, wherever they are not disintegrating under the influence of the present atmospheric agents.