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The Paper contains an analysis of the atmospheric electricity results at Kew from selected days—usually 10 a month—during the seven years 1898 to 1904. The days were chosen as representative of line weather conditions, all days being excluded when rain fell or negative potential was recorded. By means of regular observations with a portable electrometer, the curve readings from the Kelvin water-dropping electrograph were converted so as to give the potential gradient in the open, in volts per meter. All the data: mean monthly values, diurnal inequalities, etc., are given in absolute measure (volts per meter). This is believed to be the first occasion on which this has been done. The diurnal inequalities for individual months and for the whole year are represented by curves. These are mostly exceedingly smooth, thus showing that a sufficient number of years’ data have been included to give satisfactory results. The curves all show two distinct daily maxima and minima. The minima occur in all the months near 4 A. M. and 2 P. M. The times of the maxima are more variable, the day interval between the forenoon and the evening maximum being longer in summer than in winter.

A discussion of atmospheric electric potential results at Kew, from selected days during the seven Years 1898 to 1904