Stanni Pulvis. Dub. Powder of Tin

"Take of tin, any quantity. Melt it over the fire in an iron mortar, and stir it while it is cooling, until it become a powder, which, when cold, is to be passed through a sieve."

Syru Poudre d'Etain (F.), Zinn (G.), Stagno in polvere (I.)•

By this process the tin is reduced to the form of a fine granular powder, and, perhaps, by the constant stirring, it is also very slightly oxidized, for the powder has less brilliancy than the entire metal.

Medical properties and uses. - Powder of tin is a mechanical anthelmintic. It has been chiefly given to expel the tapeworm; and is supposed to operate by the grittiness of its particles irritating the worm, and dislodging it from the mucus in which it is imbedded. It is given in doses of 3 j. or 3 ij. mixed in treacle, for two or three successive mornings, followed by a brisk cathartic. The oil of turpentine has superseded its use for the expulsion of tape-worm.