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 LEAD.

Lead is one of the ancient metals and was associated in classical writings with Saturn. The lead compounds used by the ancients in medicine were white lead or ceruse (carbonate and hydrate), and litharge (oxide). Ceruse is supposed to owe its name to cera, and to mean waxy; litharge is from Greek, and means silver stone; it was regarded as the scum of silver. Red lead or minium was also used to some extent in the form of an ointment.

Although not much used now as a medicine for internal administration, lead in various forms has been tried and advocated by doctors, usually as a sedative. The Pil. Plumbi c. Opio is what remains in our Pharmacopœia of these recommendations. Galen mentions lead as a remedy in leprosy and plague, and little bullets of lead were at one time given in cases of twisted bowels. The sedative property of lead salts has caused them to be prescribed for neuralgia, hysteria, and convulsive coughs; Goulard, recognising the anticatarrhal and astringent effects of the acetate, recommended it in urethritis; and on the theory that lead poisoning and phthisis were incompatible French practitioners at one time hoped to find in lead a remedy for tuberculosis.

Litharge was the basis of most of the popular plasters, and a century or two ago there were about a hundred of these either official or in demand. Litharge was called lithargyrum auri or lithargyrum argenti, according to its colour; but the deeper tint was only the result of a stronger fire in preparing the oxide. White lead was an ingredient in several well-known old ointments, the unguentum tripharmacum of Mesué, which was the ceratum lithargyri of Galen, the unguentum