Weather Cycles

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Scientific paper

WITH reference to this most interesting question, may I be allowed to call attention to the following figures? Having had to consult Dr. Rutty's ``Natural History of Dublin,'' 1772, vol.ii., I casually found on p. 353 of that volume, in his remarkable detailed registry of the weather in Dublin for a long series of years, the following remark: ``It has been remarked that the following years were memorable for great frosts in England, viz. 1638, 1661, 1684, 1708, 1716, 1739.'' Now the intervals between these dates are 23, 23, 24, 8, 23. He further remarks, p. 368:-``It is to be observed that whereas since the great frost of 1739, until the latter end of the present summer, 1744, we had generally an unusual prevalence of dry weather, in autumn our usual wet weather returned.'' It may be remarked that the interval of 23 years is about double the sun-spot period, furthermore that the years mentioned by Rutty correspond roughly with years of sun-spot minima or maxima as given Wolf's Catalogue, mentioned by Guillemin in his work ``Le Ciel'' (1877), p. 104. This correspondence would appear as follows:-

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