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All the differences in the above list are subject to several doubts, and many of the records have been noted without a very strict attention to the question. I have, in the Cycle, mentioned the many disagreements between the tints of stars as given by Sir William Herschel and myself; and the anomaly is partly accounted for by his peculiarity of vision, and the tone of metal in his reflectors. But I am at a loss why refractors should differ so widely as here shown; and therefore hope the subject will be more closely pursued than it has hitherto been. I am aware that the notations independently made at various epochs will vary in term, though to the observer's eye they may mean nearly the same tint; but some of the differences mentioned by Signior Sestini in his interesting Memoir are singularly striking. He says "Now, beginning with the companion of 7 Andromeda, we have Smyth emerald-green and Sestini white; but Herschel and Struve at another date call it azure. Moreover, observing it again after a lapse of two years, and four years after Smyth, I

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