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In the year 1864 I communicated to the Royal Society the description of a method for the Meteorological Registration of the Chemical Intensity of Total Daylight, founded upon an exact measurement of the tint which standard sensitive paper assumes when exposed for a given time to the action of daylight. During the last two years measurements of the chemical intensity, according to this plan, have, through the kindness of Dr. Balfour Stewart, been made regularly every day at the Kew Observatory by Mr. T. W. Baker, and thus the practicability of carrying at a continued series of observations according to this method has been effectually and satisfactorily tested.

XVII. On the chemical intensity of total daylight at kew and pará, 1865,1866, and 1867