Ice-cap definition

Over the deepest valleys of the land in the interior this ice-cap must be at least 6000 or 7000 ft.

The ice-cap of Greenland must to some extent be considered as a viscous mass, which, by the vertical pressure in its interior, is pressed outwards and slowly flows towards the coasts, just as a mass of pitch placed on a table and left to itself will in the course of time flow outwards towards all sides.