Abstract
IN a most interesting article on the planet Mars, in your issue of NATURE for Feb. 19, which has just been shown to me, the Rev. T. W. Webb directs attention to the question of the colours of Mars being due to effects of contrast or not, and says—“Nor does it seem to have been noticed that no effect of contrast has been traced in the Polar snows.”
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KNOBEL, E. Mars. Nature 9, 383 (1874). https://doi.org/10.1038/009383c0
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DOI: https://doi.org/10.1038/009383c0
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