. Annual report of the Board of Regents of the Smithsonian Institution . , May 29, 4h 26™ p. m. Scale: Suns diameter= Fig. 2.—Sun-spot and Hydrogen (//«) Flocculi. 1908, June 2, Gl 10 a. m. Scale: Suns diameter= muter. Smithsonian Report, 1908,—Abbot. Plate 2.

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Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840