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In this paper the results of observations made by exposing platino-type paper are recorded, and it is shown that the total intensity of light as thus registered is the same as if observations had been made on a ray of λ 4240 alone. The observations were made at altitudes varying from sea-level to 12,000 feet, in different countries, at different times of the year, and during four to five years. The instrument in which the exposures were made is described, as also the method of deriving the intensity of light from the developed prints.

I. Transmission of sunlight through the earth’s atmosphere. Part II. Scattering at different altitudes