A slate-blue amorphous powder.

Solubility. - It is insoluble in water, soluble in hydrochloric acid.

Reactions. - The solution yields a precipitate with both the yellow (ferric) and red prussiates of potash, that afforded by the latter being the more abundant (ferrous); and when treated with tartaric acid and an excess of ammonia, and subsequently with the solution of ammonio-sulphate of magnesium, lets fall a crystalline precipitate (phosphate). When the salt is

J digested in hydrochloric acid with a lamina of pure copper, a dark deposit does not form on the metal (distinction from and absence of arseniate).

Dose. - 5 to 10 grains.

Preparations Containing Phosphate Of Iron

B.P.

Dose.

Syrupus Ferri Phosphatis (freshly-precipitated phosphate (p. 738) is dissolved in dilute phosphoric acid and sugar added) 1 gr. in 1 fl. dr. ..........................

1 fl. dr.

U.S.P

Syrupus Ferri, Quininae, et Strychninae Phosphatum. (Phosphate of iron, 133; quinine,133; strychnine, 4; phosphoric acid, 800; sugar, 6,000; distilled water up to 10,000.) This preparation resembles Easton's Syrup.

Uses. - It is used in diabetes, in rickets, and in nervous depression. It is frequently given along with the phosphates of calcium, potassium, and sodium, as the preparation usually called Parrish's Chemical Food, or with the phosphates of quinine and strychnine, as in Easton's Syrup.