CLOUDS AND RIVERS, ICE AND GLACIERS. 11/ 



of the glacier, and which must have then appeared as 

 island peaks and crests in the midst of an ocean of ice. 



366. We now scamper down the Siedeihorn, get once 

 more into the valley of Hasli, along which we follow 

 for more than twenty miles the traces of the ice. Fluted 

 precipices, polished slabs, and beautifully -rounded 

 granite domes. Eight and left upon the mountain 

 flanks, at great elevations, the evidences appear. We 

 follow the footsteps of the glacier to the Lake of 

 Brientz ; and if we prolonged our enquiries, we should 

 learn that all the lake beds of this region, at the time 

 now referred to, bore the burden of immense masses 

 of ice. 



367. Instead of the vale of Hasli, we might take the 

 valley of the Ehone. The traces of a mighty glacier, 

 which formerly filled it, may be followed all the way to 

 Martigny, which is 60 miles distant from the present 

 ice. At Martigny the Ehone glacier was reinforced by 

 another from Mont Blanc, and the welded masses 

 moved onward, planing the mountains right and left, to 

 the Lake of Geneva, the basin of which they entirely 

 filled. Other evidences prove that the glacier did not 

 end here, but pushed across the low country until it 

 encountered the limestone barrier of the Jura Moun- 

 tains. 



§ 54. Erratic Blocks. 



368. What are these other evidences ? We have 

 seen mighty rocks poised on the moraines of the Met 



