Emplastrum Resinae. Lond. Resin Plaster

"Take of resin, half a pound; lead plaster, three pounds. Melt the lead plaster with a gentle heat; then add the resin in powder, and mix."

Emplastrum Resinosum, Edin. Resinous Plaster.

"Take of plaster of semivitreous oxide of lead, five parts; resin, one part. Melt them with a gentle heat; then continue stirring the mixture until it becomes stiff in cooling."

Emplastrum Lithargyri cum Resina, Dub. Litharge Plaster, with Resin.

"Take of litharge plaster, three pounds and a half; yellow resin, half a pound. Melt the litharge plaster by a moderate heat; then add the resin reduced to a very fine powder, that it may melt quickly, and form a plaster."

Syn. Harzigtes Bleipflaster (G.).

These plasters are defensive, adhesive, and gently stimulant. They are used for retaining together the lips of recent wounds, when it is wished to heal them by the first intention; to support ulcerated parts; and to assist their granulation and cicatrization, according to the excellent method of Mr. Bayn-ton. The plaster, however, originally used by Mr. Baynton, contained less resin; 3 vj. only being added to lb. j. of the litharge plaster; but this preparation answers the purpose equally well, except in very irritable habits. The best substance for spreading it on is calico; and it is of some importance to spread it equally, and thin; to effect which the calico mus tbe stretched, and the plaster, melted and beginning to cool, must be poured on one end of it, and equally extended over the whole surface by means of a spatula, held nearly horizontally, with one edge of the blade raised to an angle of 45 degrees: or it may be still more equally done by passing the calico, on which the fluid plaster has been poured, through a machine formed of a straight blade of steel, fixed by screws, at a proper distance from a polished plate of the same metal.

It is sold ready spread.

Emplastrum Saponis. Lond. Dub. Soap Plaster

"Take of soap, sliced, half a pound; lead plaster, three pounds. Mix the soap with the melted plaster; then boil to a proper consistence."

Emplastrum Saponaceum, Edin. Soap Plaster.

"Take of semivitreous oxide of lead, four parts; gum plaster, two parts; soap, sliced, one part. Mix the soap with the plasters melted together; then boil them a little, so as to form a plaster."

Syn, Seifenpflaster (G.).

Dr. Powell properly observes, that the soap plaster of the London College "must be formed into rolls, when it begins to thicken, for afterwards, although it be still somewhat soft, it loses its tenacity, and will break to pieces."1

1 Powell's Translation of the London Pharmacopoeia, 2d edit. 324.

Soap plaster is discutient; and is applied to lymphatic tumours : but it is much less useful than the mercurial plaster.

Emplastrum Saponis compositum, vel adherens, Dub. Compound Soap Plaster.

"Take of soap plaster, two ounces; litharge plaster with resin, three ounces. Let a plaster be made, which when softened by heat can be spread on linen."

An excellent plaster for bandaging sore legs.