GLACIERS AND ICE. 
45 
blished the fact of a continued motion. But it is chiefly from 
the repeated examinations of Principal Forbes, who has de- 
voted many years to a critical survey of the glaciers of 
Norway and the Alps, and the intrepid observations of 
Professor Tyndall, that the movement of glaciers was found to 
be subject to certain laws which have been sought out and 
* This and the following woodcut are taken from the “ Glaciers of the 
Alps,” — published by Murray. 
