"Take of ammoniacum, two drachms; water, half a pint. Triturate the ammoniacum, gradually adding the water, until they be thoroughly mixed."

Dublin.

"Take of gum ammoniacum a drachm; pennyroyal water, eight fluid ounces. Triturate the gum, gradually adding the pennyroyal water, until the mixture acquire the appearance of milk, which is to be strained through linen."

The resinous part of the ammoniacum is suspended in the water by means of the gummy part; but after a little time the greater portion of the resin subsides. It is coagulated by distilled vinegar, the oxymels, aether, spirit of nitric aether, bitartrate of potassa, and bichloride of mercury, which are therefore incompatible in prescriptions with mixture of ammoniacum. It is advantageously employed as an expectorant in doses of from f ss. to f j., combined with an equal quantity of almond mixture.