A 300-Year Climatic and Solar Cycle


IN June, 1902, I made a few remarks on an apparent coincidence between sun-spot periods and longer periods of rainfall and famine in north China. Not being, in any sense, a meteorologist, I did not publish my conclusions except locally. In connection with a notice in the “Astronomical Column” of NATURE, November 9 last (vol. lxxiii. p. 38), they are of sufficient general importance to recall them. The notice in NATURE 15 headed “A 300-year Cycle in Solar Phenomena,” and refers to a discussion in the Astrophysical Journal wherein Mr. H. W. Clough, of the Washington Weather Bureau, arrives at the conclusion that a 300-year cycle exists in solar and the allied terrestrial phenomena, and finds likewise an intermediate 36-year cycle, and supports both by a reference to various phenomena, such as auroræ, periods of grape harvest, &c.

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