large stones found on glaciers, supported on pedestals of ice. The stones attain this peculiar position through the melting away of the ice around them and through the depression of its general surface by the action of the sun and rain. The block, like an umbrella, protects the ice below it from both; and accordingly its elevation measures the level of the glacier at a former period. By and by the stone table becomes too heavy for the column of ice on which it rests, or its equilibrium becomes unstable, whereupon it topples over, and, falling on the surface of the glacier, it covers a new space of ice and begins to form another table. See GLACIERS.