XI 
RECAPITULA TION 
267 
attempting to penetrate a long arm of 
the sea, would behold the not lofty sur¬ 
rounding mountains, sending down their 
many grand icy streams to the sea-coast, 
and their progress in the boats would be 
checked by the innumerable floating 
icebergs, some small and some great ; 
and this would have occurred on our 
twenty-second of June, and where the 
Lake of Geneva is now spread out ! 1 
1 In the former edition and Appendix, I 
have given some facts on the transportal of 
erratic boulders and icebergs in the Antarctic 
Ocean. This subject has lately been treated 
excellently by Mr. Hayes, in the Boston Journal 
(vol. iv. p. 426). The author does not appear 
aware of a case published by me (Geographical 
Journal , vol. ix. p. 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 com¬ 
monly 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 Phil. Mag. vol. xxi. p. 180) the 
adjoining action of glaciers and of floating 
icebergs. 
MACROCYSTIS PYRIFERA, OR MAGELLAN KELP. 
