These are compositions which have the consistence of oil or balsam; so as to allow them to be easily rubbed upon the skin. They are in general more active remedies than cerates or ointments; and act as local stimulants, relieving deep-seated inflammations and pains.

Infusum Sennae Compositum. Edin. Infusion of Tamarinds and Senna

"Take of preserved tamarinds, one ounce; senna leaves, one drachm; coriander seeds, bruised, half a drachm; raw sugar, half an ounce; boiling water, eight ounces. Macerate in a covered earthen vessel, which is not glazed with lead, shaking frequently, and, after four hours, strain.

"It may be made also with double or triple the proportion of senna."

Infusum Sennae cum Tamarindis, Dub. Infusion of Senna and Tamarinds.

The same as the Edinburgh formula.

These infusions are pleasanter than the simple infusions, the nauseous taste being well covered by the sugar and the acid of the tamarinds; in other respects they agree both in their properties and in the effects of the incompatible substances; to which, however, must be added all salts having potassa for their base.

Infusum Serpentariae. Lond. Infusion of Ser-pentaria

"Take of serpentaria, half an ounce; boiling distilled water, a pint. Macerate for four hours in a lightly-covered vessel, and strain."

This infusion is a stimulating, diaphoretic tonic. It is advantageously administered in low fevers. The dose is f ss. to f ij.

Infusum Simaroubae. Lond. Dub. Infusion of Simaruba

"Take of simaruba, bruised, three drachms; boiling distilled water, a pint. Macerate for two hours in a lightly-covered vessel, and strain."

This infusion is inodorous; has a slightly bitter, astringent taste, is clear, and of a greenish straw-colour. The alkaline carbonates and lime-water render it milky; nitrate of silver, bichloride of mercury, acetate and diacetate of lead, infusions of galls, catechu, and yellow cinchona bark, precipitate it.

Medical properties and uses. - Simaruba infusion possesses the same properties as the bark, and is the best form of exhibiting the remedy, but it is not much used in this country. The dose is f j. to f ij., combined with tincture of opium, or an aromatic.

Infusum Tabaci. Dub. Infusion of Tobacco

"Take of tobacco leaves, a drachm; boiling water, a pint. Macerate for an hour in a lightly-covered vessel, and strain."

This infusion is clear, of a reddish-brown colour; has the odour of the plant in a slight degree, and a hot, very acrid taste.

Medical properties and uses. - Tobacco infusion is chiefly intended to be given under the form of enema; for although it has been occasionally employed as an emetic, it cannot be recommended. As an enema it has been found useful in ileus, colica pictonum, incarcerated hernia and dysury: the practice of employing it in cases of suspended animation is justly condemned.