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 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. 



MACROCYSTJS PYRIFERA, OK MAGELLAN KELP, 



