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 Nettleton's. Dr. Dawson wrote to Dr. Key, who at once sent him the recipe, which was as follows:—

Take 1 oz. each of aqua fortis and mercury; dissolve and add the solution to 8 oz. of butter melted. To this add 2 drachms of camphor dissolved in 2 oz. of olive oil.

About the end of the eighteenth century, a citrine ointment, made with an ounce of mercury dissolved in nitric acid and incorporated with a pound of lard, was introduced into the Hotel Dieu Hospital of Paris, and used to cure itch. The formula was adopted in the Dublin Pharmacopœia, 1807.

COLD CREAM.

The Unguentum Refrigerans, also called "Ceratum," appeared in the first P.L., the formula being attributed to Galen. Four ounces of white wax were melted in 1 lb. of rose oil (ol. rosarum omphacinum, that is, olive oil in which rose buds 4 oz. to the lb. had been macerated, the maceration being carried out three times, each time with a fresh lot of roses). The melted oil and wax were to be poured frequently from one vessel to another, stirring in a little cold water meanwhile, until the mixture became white. Lastly, it was to be washed with rose water, and a little rose water and rose vinegar were to be added.

The original formula for this plaster was compiled by Tiberius Claudius Menecrates, who lived in the reign of the Emperor Tiberius, and was probably his physician. In a Greek inscription discovered at Rome he is