lyzed behind this filter which was compensated, at each wave length, for the photochemical efficiency of this photolysis according to (unpublished) data by P. A. Leighton. Changes in total intensity and in spectral energy distribution are integrated by this device. The losses per hour in iodine value y were for seven carbon arcs, cored and uncored, plotted as ordinates against x, the reciprocals of times in which the same sources, without filters, produced a standard erythema. Roughly, yax. For the more efficient sources, y = ax + b is preferable. The indicated threshold value will be further studied. Similar chemical actinometers for such purposes as photography, antirachitic therapy or even chlorophyll assimilation are possible.
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