"Take of horse-radish sliced, mustard bruised, of each an ounce; compound spirit of horse-radish, one fluid ounce; boiling distilled water, a pint. Macerate the root and seeds in the water for two hours in a lightly-covered vessel, and strain; then add the compound spirit of horse-radish."

This infusion, after it is strained, deposits by rest a whitish feculent matter, which should be separated. The supernatant clear part is of a sulphur-yellow colour, and holds, dissolved in every fluid ounce, rather more than grs. x. of solid matter. It has a very pungent odour, and a hot, biting taste; precipitates infusion of galls, yellowish; and infusion of yellow cinchona bark, white. The solutions of the pure alkalies do not affect it; but with their carbonates whitish precipitates are produced; bichloride of mercury and nitrate of silver also cause precipitates: thence all these substances, except the pure alkalies, are incompatible in formulae with this infusion. It soon spoils in hot weather, and emits an offensive odour.

Medical properties and uses. - This is not an unusal form of giving horse-radish, the stimulant and diuretic properties of which are aided by that of the mustard. It is particularly serviceable in paralysis, and in dropsies occurring after inter-mittents. The dose is from f j. to f iij. given three or four times a day.