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The sun himself represents a crowd of pending problems. His peculiar mode of rotation; the level of sunspots; the constitution of the photospheric cloud-shell, its relation to faculae which rise from it, and to the surmounting vaporous strata; the nature of the prominences; the alternations of coronal types; the affinities of the zodiacal light all await investigation.
"How beautiful!" he thought, looking at the strange, as it were, mother-of-pearl shell of white fleecy cloudlets resting right over his head in the middle of the sky. "How exquisite it all is in this exquisite night! And when was there time for that cloud-shell to form? Just now I looked at the sky, and there was nothing in it only two white streaks.
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