ICE AND GLACIEKS. 



109- 



slowly. That this must be the case follows from the con- 

 siderations by which I have endeavoured to explain the origin 

 of a glacier. For as the ice is being constantly diminished at 



FIG. 18. 



the lower end by melting, it would entirely disappear if fresh ice 

 did not continually press forward from above, which, again, is 

 made up by the snowfalls on the mountain tops. 



But by careful ocular observation we may convince ourselves 

 that the glacier does actually move. For the inhabitants of the 



