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_Electric Properties o]" JPTa 'mes. 149 Magnetic Observation during the Total Eclipse of May 17, 1882.--There is still some uncertainty as to the true cause of the abnormal magnetic variation, which is generally observed during solar eclipses. Is it a direct magnetic action of the two bodies which are ill conjunction, or is it a simple effect of the variation of temperature aml of atnmspherie humidity, which ordinarily accompany the phenomenon? The observations at Zi-Ka-Wei, China, during the eclipse of May 17, 1882, seem to corroborate the second hypothesis and to remove all probability from the first. Marc Dcchevrens, the director of the Zi-Ka-Wei observatory, reports his own observations upon that occasion, and confirms his conclusions by comparisons with observations upon the eclipses of 1868, at C61~bes, and 1878, at Denver. He finds additional confirmation from the disappointment of Dr. Little, an amateur astronomer of Shanghai, who was unable to make the observations which he expected on account of the cloudy sky. [These conclusions are confirmatory of the views recorded by Chase, in 1864.
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