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and Plencks depilatory, have a similar composition. They all, probably, contain arsenic, in the form of orpiment. The following formula has been given for that of Colley: quicklime, 30 parts; soap Ices, 125 parts; sulphur, 4 parts; nitre, 4 parts; orpiment, 12 parts. Another depilatory by F. Boudet is formed of sulphuret of sodium, 3 parts; quicklime, in powder, l0; starch, 10; mix. Rub a little of this powder with water; apply it to the part, and remove the hair in a minute or two with a wooden knife. Dorvault recommends the Depilatory of Martins, which is a sulphuretted sulphuret of calcium; made by passing sulphohydric acid into quicklime to saturation. A little of this is applied to the part, and in eight or ten minutes it becomes solid. It must then be washed off with cold or hot water, when the skin will be found denuded. Another, given by Redwood, is a strong solution of the sulphuret of barium, made into a paste with starch powder. It is used like the one advised by Boudet. Those that do not contain arsenic are, of course, safer. A pitch plaster Pitch-cap, is sometimes used as a depilatory. It of course pulls the hair out by the roots.