This does not represent an ice-sheet moving down continuously from
the high grounds and tearing up the rocks. It rather breaks off like
great icicles from the caves of a house.

Again: the ice-sheets to-day do not striate or groove the rocks over
which they move.

Mr. Campbell, author of two works in defense of the iceberg
theory--"Fire and Frost," and "A Short American Tramp"--went, in
1864, to the coasts of Labrador, the Strait of Belle Isle, and the
Gulf of St. Lawrence, for the express purpose of witnessing the
effects of icebergs, and testing the theory he had formed. On the
coast of Labrador he reports that at Hanly Harbor, where

[1. "Popular Science Monthly," April, 1874, p. 646.]

{p. 36}

the whole strait is blocked up with ice each winter, and the great
mass swung bodily up and down, "grating along the bottom at all
depths," he "found the rocks ground smooth, but _not striated_."[1]
At Cape Charles and Battle Harbor, he reports, "the rocks at the
water-line are _not striated_."[2] At St. Francis Harbor, "the
water-line is much rubbed smooth, but _not striated_."[3] At Sea
Islands, he says, "No striæ are to be seen at the land-wash in these
sounds or on open sea-coasts near the present waterline."[4]

Again: if these drift-deposits, these vast accumulations of sand,
clay, gravel, and bowlders, were caused by a great continental
ice-sheet scraping and tearing the rocks on which it rested, and