[Liquor Ferri Tersulphatis. Solution of Tersulphate of Iron. U.S.]

Prep. By boiling a solution of protosulphate of iron and sul-phuric acid with nitric acid, until all the proto- is converted into a per-sulphate.

Prop. & Comp. It forms a solution of a dark-red color, which exhibits the reactions of the persalts of iron. Sp. gr. 1.441. One fluid drachm yields with ammonia 11.44 grains of peroxide of iron.

Use. It is used in preparing other ferruginous salts, and is not given as a remedy. It would be highly astringent.

[Liquor Ferri Subsulphatis. Solution of Sub-sub-sulphate of Iron. Solution of persulphate of iron. Monsel's solution. U. S.

A troy ounce and thirty grains of sulphuric; a troy ounce and three hundred grains of nitric acid; and half a pint of distilled water are heated to the boiling point. Twelve ounces of sulphate of iron in powder is gradually added, and the whole is boiled until nitrous vapours are no longer perceptible and the colour is a deep ruby-red; water is added to make it measure twelve fluid ounces. An inodorous, syrupy fluid of a ruby-red colour, and an intensely astringent taste. Sp. gr. 1.552.

A very powerful astringent, applied either diluted or of full strength. Given internally likewise as an astringent in doses of from 3 to 10 minims.]

Ferri Ammonio-Chloridum. Ammonio-Chloride of Iron. Not officinal. Prep. Made by forming a perchloride of iron by dissolving the peroxide in hydrochloric acid, then adding hydrochlorate of ammonia in solution in water, evaporating to dryness, and afterwards rubbing the saline mass to powder.

Prop. and Comp. It occurs in small orange pulverulent grains of hydrochlorate of ammonia stained with the sesquichloride of iron, and is not a true chemical compound; soluble in proof spirit and water; and 100 grains of the salt made according to the London Pharmacopoeia of 1851 contain about 15 grains of perchloride of iron, the remainder being hydrochlorate of ammonia.

Of. Prep. Tinctura Ferri Ammonio-Chloridi. Tincture of Ammonio-Chloride of Iron. Lond. 1851. (Ammonio-chloride of iron, four ounces and one hundred and seventy grains; proof spirit, and distilled water, each half a pint. Dissolve and strain.) An ounce of this tincture, on the addition of potash, should yield 5.8 grains of sesquioxide of iron.

Therapeutics. As three-fourths of the weight of the ammoniochloride of iron is sal ammoniac, it may be regarded as a preparation of this latter salt, equally as one of iron. It may be given as an alterative as well as a tonic and astringent.

Dose. Of the salt, 5 gr. to 15 gr.; of the tincture, 10 min. to 1/2 fl. drm.