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..