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

This infusion is slightly turbid; of a brownish colour; has a somewhat aromatic odour, and a bitter taste. The solution of sulphate of iron throws down a greenish-yellow precipitate; sulphate of zinc a yellowish one; sulphate of copper a pea green; nitrate of silver, bichloride of mercury, acetate and diacetate of lead, infusions of galls and of catechu also cause precipitates in it. Tartar emetic is slowly decomposed by it. These substances, therefore, cannot properly be ordered in formulae with this infusion.

Medical properties and uses. - This infusion possesses the stimulant and tonic properties of the bark, and is an useful form of giving it in typhoid fevers, obstinate bilious diarrhoea, and in dysentery, after proper evacuations. The tincture of cinnamon covers its taste, and makes it sit lighter on the stomach. The dose is from f j. to f iij. given every three or four hours.