Abstract
The general quantitative features of the dependence on wave-length of the production of erythema in human skin by ultra-violet radiation were established, as is well known, by the classical investigations of Hausser and Vahle (1921, 1927; cf. Hausser 1928, 1934). Subsequent measurements by Luckiesh, Holladay and Taylor (1930), Uhlmann (1930), and Coblentz, Stair and Hogue (1931) have confirmed and extended the results, so that there are now available relatively complete quantitative experimental data in terms of which the pharmacological actions of ultra-violet radiation must be interpreted.

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