Abstract
THE communications in NATURE, vol. xx. p. 625, regarding the note of Prof. Piazzi Smyth, NATURE, vol. xx. p. 602, induce me to send an extract from my observing-book on those spots, together with some observations of them by Herr Hartwig, assistant to the observatory.
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WINNECKE, A. Sun-Spots in Earnest. Nature 21, 10 (1879). https://doi.org/10.1038/021010b0
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DOI: https://doi.org/10.1038/021010b0
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