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 *taining rock alum and sal ammoniac, in addition to the other ingredients mentioned, was included in the London Pharmacopœia 1721. In some foreign pharmacopœias camphor was prescribed as an ingredient, and in one old one theriaca is ordered.

Various earths were celebrated as medicines in old times, that from the Island of Lemnos especially having been esteemed from the days of Herodotus among the Greeks, and this product retained its reputation in Western Europe down to the seventeenth century. It is still used by the Turks and neighbouring nations. The Lemnian earth is a greasy clay which is dug from a desolate hill in the island and consists of silica, alumina, chalk, and magnesia, with a little oxide of iron which gives it a red tint. It acquired the fame of being an antidote to all poisons, and was given in dysenteries, internal ulcers, and hæmorrhages; also in gonorrhœa, and in pestilential fevers. Externally it was applied to festering wounds. The characteristic of the best Lemnian earth was its greasy feel and freedom from grit.

A sufficient supply of this Lemnian earth is still, and has been certainly from the time of Galen, dug out of the hill only on one day of the year, with considerable ceremony and in the presence of the principal inhabitants of the island. At present the ceremony is largely a religious one, and the day fixed for it is the 6th of August, which in the Greek church calendar is the Fête of the Saviour. Formerly the ceremony was originally associated with the worship of Diana, and the date of the performance was the 6th of May. The