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    SOLAR ACTIVITY IN 1886.—The latter part of 1886 showed a most remarkable falling off in the number and size of the sun-spots, a falling off so great as to lead so experienced an observer as Prof. Tacchini to speak of it as possibly the minimum of the eleven-year period. The following numbers, taken from Prof. Tacchini's tables (Comptes rendus, vol. ciii. No. 2, and civ. No. 4), may be compared with those we gave (NATURE, vol. xxxiii. p. 398) for the year 1885:—

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