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Glacialist Washburn explained that glaciers move because of pressure in their catchment basins at their sources.

This enthusiastic glacialist has spent many summers tracing the terminal moraine with its fringe along the lines heretofore indicated.

Much of the history of those times is a sealed book, but the persevering energy of the glacialist and archæologist is gradually turning the leaves of this old book and revealing new chapters of the wonderful story of the ice.