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IT is now generally conceded by those who have given the subject much attention that the greater portion of North America above the latitude of 39 Degrees north to the shores of the Arctic Ocean has been furrowed and scoured by the action of ice. Vast traces of ancient glaciers are also found in Europe; for it is reported that ice-sheets have left unmistakable marks of having overrun the greater part of the lands lying between the arctic seas and the latitude of the Pyrenees. In Asia evidences of glacial action have been noticed from Northern Siberia to the mountains of Syria. The great glaciers of Himalaya have in times past attained gigantic proportions. In Northern China huge bowlders are found scattered over the valleys, and a long distance from the mountains.

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