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 quarter long and 2,000 feet thick he could completely hide the city of New York under it, and Trinity steeple would only stick up into it relatively as far as a shingle nail would stuck up into the bottom of a Saratoga trunk.

"The boulders from Mont Blanc, upon the plain below Ivria, assure us that the glacier which transported them existed for a prodigious length of time. Their present distance



from the cliffs from which they were derived is about 420,000 feet, and if we assume that they traveled at the rate of 400 feet per annum, their journey must have occupied them no less than 1055 years! In all probability they did not travel so fast."

Glaciers are sometimes hurried out of their characteristic snail-pace. A marvelous spectacle is presented then. Mr. Whymper refers to a case which occurred in Iceland in 1721:

"It seems that in the neighborhood of the mountain Kotlugja, large bodies of water formed underneath, or within the glaciers (either on account of the interior heat of the