Abstract
THE results at which M. Ch. Montigny had arrived with regard to stars (see NATURE, vol, xiv. p. 562) have since been thoroughly confirmed by his further researches on this subject. The series of observations now comprises no less than 447 evenings, and the predominant influence of rain, upon the intensity of scintillation may now be recognised as proved beyond doubt. We may here remind our readers that the intensity of scintillation is measured by the number of changes of colour which the star shows: in the scintillometer during one second, and that M. Montigny has first proved that approaching moist weather increases this, intensity. The frequent occurrence of wet days in the year from August, 1876, to August, 1877, has increased the average intensity from 71. to 76; but the following very.dry auttimn of 1877 brought down the average to 68 for that season.
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