Abstract
On account of investigations on the effect of light on various marine and freshwater organisms which are being carried on at the Atlantic Biological Station, St. Andrews, N.B., Canada, it was necessary to know something of the energy values of sunlight, especially of its ultra-violet component, and also of moonlight. Consequently a Moll-Richard-Gorczynski pyrheliometer, and various other apparatus for measuring natural radiation, were brought into use in the summer of 1926. It was found that the sun, shining from a clear sky in June at this Station (Lat. 45° N. sea-level) had an energy value of 1.55 gm. cal. per sq. cm. per min., and data on the effects of clouds and haze were obtained. The ultra-violet component of the sun's radiation was found to be 2% of the total radiation in August. The energy value of the light of the full moon, at an elevation of 22° above the horizon in July was found to be 0.0000029 gm. cal. per sq. cm. per min., or about 1/555,000 that of full noon June sunlight.
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