I am not so ignorant about glacial movement, now, as I was when I took passage on the Gorner Glacier. I have "read up" since. I am aware that these vast bodies of ice do not travel at the same rate of speed; while the Gorner Glacier makes less than an inch a day, the Unter-Aar Glacier makes as much as eight; and still other glaciers are said to go twelve, sixteen, and even twenty inches a day. One writer says that the slowest glacier travels twenty-five feet a year, and the fastest four hundred.

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