This subject has
lately been treated excellently by Mr. Hayes, in the "Boston
Journal" volume 4 page 426. The author does not appear aware of a
case published by me "Geographical Journal" volume 9 page 528, of a
gigantic boulder embedded in an iceberg in the Antarctic Ocean,
almost certainly one hundred miles distant from any land, and
perhaps much more distant. In the Appendix I have discussed at
length the probability (at that time hardly thought of) of
icebergs, when stranded, grooving and polishing rocks, like
glaciers. This is now a very commonly received opinion; and I
cannot still avoid the suspicion that it is applicable even to such
cases as that of the Jura. Dr. Richardson has assured me that the
icebergs off North America push before them pebbles and sand, and
leave the submarine rocky flats quite bare; it is hardly possible
to doubt that such ledges must be polished and scored in the
direction of the set of the prevailing currents. Since writing that
Appendix I have seen in North Wales "London Philosophical Magazine"
volume 21 page 180) the adjoining action of glaciers and floating
icebergs.
CHAPTER XII.
(PLATE 60. TROCHILUS FORFICATUS.
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