I have already described the granular appearance of glacier ice as seen in polarized light and also the striations on the granules as shown by pencil rubbings. Last summer I succeeded in obtaining exact reproductions, in plaster of Paris, of the ice surface-structure in the upper cave in the Rhone Glacier. These are shown in Figs. 1–3.
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R. M. Deeley (1910) studied this question.