26 GLATJCUS; OR, 



having no large and deep outlet, has not slid 

 down in a sufficient stream to reach the vale 

 below, and form a glacier of the first order ; and 

 has therefore stopped short on the other side of 

 the lake, as a glacier of the second order, which 

 ends in an ice cliff hanging high upon the mountain- 

 side, and kept from further progress by daily melt- 

 ing. If you have ever gone up the Mer de Glace 

 to the Tacul, you saw a magnificent specimen of 

 this sort on your right hand, just opposite the 

 Tacul, in the Glacier de Trelaporte, which comes 

 down from the Aiguille de Charmoz. 



This explains our pebble-ridge. The stones which 

 the glacier rubbed off the cliff beneath it, it carried 

 forward, slowly but surely, till they saw the light 

 agam in the face of the ice-cliff, and dropped out 

 of it under the melting of the summer sun, to 

 form a huge dam across the ravine ; till, the " Ice- 

 age" past, a more genial climate succeeded, and 

 neve and glacier melted away : but the " moraine " 

 of stones did not, and remain to this day, the dam 

 which keeps up the waters of the lake. 



