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doi: 10.1038/002048c0
Your correspondent “H. A. N.” will find some interesting remarks on the blueness of the sky in Professor Tyndall's “Glaciers of the Alps” (p. 257, c and in expeditions to mountains of nearly the same height I have not often seen it approached, never surpassed. Mr. Hincliff in his “Summer Months among the Alps,” p. III, calls attention to the same phenomenon on Monte Rosa, and very appositely quotes Shelley : The sun's unclouded orb Rolled through the black concave.
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