vi MOUNTAINS 231 



occupied by another which filled the basin 

 of the Lago Maggiore ; a third occupied the 

 valley of the Dora Baltea, and has left a 

 moraine at Ivrea some twenty miles long, and 

 which rises no less than 1500 feet above the 

 present level of the river. The Scotch and 

 Scandinavian valleys were similarly filled 

 by rivers of ice/ which indeed at one time 

 covered the whole country with an immense 

 sheet, as Greenland is at present. Enor- 

 mous blocks of stone, the Pierre a Niton 

 at Geneva and the Pierre a Bot above 

 Neuchatel, for instance, were carried by 

 these glaciers for miles and miles ; and many 

 of the stones in the Norfolk cliffs were 

 brought by ice from Norway (perhaps, how- 

 ever, by Icebergs), across what is now the 

 German Ocean. Again wherever the rocks 

 are hard enough to have withstood the 

 weather, we find them polished and ground, 

 just as, and even more so than, those at the 

 ends and sides of existing glaciers. 



The most magnificent glacier tracks in the 

 Alps are, in Ruskin's opinion, those on the 

 rocks of the great angle opposite Martigny ; 



