12. Ferri et Potassii Tartras. Iron and Potassium Tartrate, official 1830-1910. - Obtained by preparing ferric hydroxide as in ferri et ammonii tartras; heat potassium bitartrate 38 Gm. with distilled water 300 Ml. (Cc.)-, gradually add the precipitate (ferric hydroxide) in portions, stir, when dissolved filter, let stand 24 hours, stir to incorporate the precipitate, add ammonia water q. s. to dissolve precipitate, evaporate to syrup, dry on glass. It is in thin, transparent, garnet-red, redish-brown scales, odorless, sweetish, ferruginous taste, deliquescent, soluble in water, insoluble in alcohol; contains amount of salt corresponding to 15 p. c. of metallic iron. One of the richest preparations in iron, most agreeably tasting, least constipating and least irritating to stomach and bowels of the iron salts. Should be kept dark, in well-stoppered bottles. Dose, gr. 5-15 (.3-1 Gm.), ter die.

13. Ferri Hydroxidum. Ferric Hydroxide, Fe(OH)3, official 1830-1910. - Obtained by diluting ammonia water 138 Ml. (Cc.) with water 500 Ml. (Cc), constantly stirring, and to this add solution of ferric sulphate 100 Ml. (Cc), previously diluted with water 1000 Ml. (Cc), wash precipitate several times with water 1000 Ml. (Cc), finally mix it with water q. s. 300 Gm., if order reversed, have formed basic ferric sulphate; when wanted for arsenous acid poisoning in great haste, much washing may be omitted, as the retained ammonia serves as a stimulant, thus neutralizing some of the depressing effects of the poison. It is a brownish-red magma, soluble in hydrochloric acid without effervescence. Largely as an antidote to arsenic-poisoning, a very good substitute for official: Ferri Hydroxidum cum Magnesii Oxido. Dose, 3j-4 (4-15 Gm.).

14. Ferri Voleras. Ferric Valerate, Fe2(C5H9O2)6, official 1880-1900. - Obtained by precipitating diluted solution ferric sulphate (or chloride) with cold solution sodium valerate (valerianate), washing, drying precipitate. It is a dark brick-red amorphous powder, varying composition, valerian odor, permanent, insoluble in cold water, soluble in alcohol; chars into ferric oxide, contains 15-20 p. c of metallic iron. Chalybeate tonic; anaemia, nervous exhaustion, hysteria, diabetes insipidus. Dose, gr. 1-5 (.06-.3 Gm.).

15. Ferri Ferrocyanidum. Ferric Ferrocyanide, Fe43Fe(CN)6, official 1830-1880. - Obtained by adding an aqueous solution potassium ferrocyanide to diluted solution ferric sulphate. It is dark blue, insoluble in water; poor chalybeate - its iron inert, cyanogen non-poisonous. Dose, 3ss-l (2-4 Gm.).

16. Ferrum Dialysatum. Dialyzed Iron. - Obtained by saturating aqueous solution of ferric chloride with fresh ferric hydroxide, putting into a dialyzer and suspending in water; all the acid passes through the septum, but very little iron. Used like Tinctura Ferri Chloridi, with the advantages of having no styptic taste, not staining teeth, nor constipating. Dose, ev -30 (.3-2 Ml. (Cc)), diluted with water.

17. Ferr'i Glycerophosphas. Ferric Glycerophosphate, Fe2(C3H5(OH)2-PO4)3. - Obtained by dissolving fresh ferric hydroxide in glycero-phosphoric acid, evaporating, spreading on glass plates, drying. It is in yellowish-green transparent, amorphous scales, powder, odorless, nearly tasteless, soluble in water (2), insoluble in alcohol. Dose, gr. 3-10 (.2-.6 Gm.).

18. Ferri Citras. Ferric Citrate, Fe2(C6H5O7)2,6H2O, official 1850-1910. - Obtained by dissolving fresh ferric hydroxide in water + citric acid, concentrating on water-bath at 60° C. (140° F.) to syrupy consistence, spreading on glass plates to dry in dust-proof closets; higher temperature prevents scaling and reduces to ferrous compound; yield 42-44 p. c, by weight, of solution used. It is in thin, transparent, garnet-red scales, odorless, slight ferruginous taste, soluble in water, insoluble in alcohol, chars into ferric oxide; contains pure salt corresponding to 16 p. c. of metallic iron. Impurities: Alkali citrates, tartrates. Mild tonic; delicate stomachs, children, with or without food. Should be kept dark, in well-stoppered bottles. Dose, gr. 5-15 (.3-lGm.).

19. Ferri Pyrophosphas. Ferric Pyrophosphate, official 1860-1910 (Ferri Pyrophosphas Solubilis): ferric citrate 50 Gm., sodium pyrophosphate 50 Gm., water 100 Ml. (Cc), evaporate solution to syrup, dry on glass. It is in thin apple-green transparent scales, odorless, acid, saline taste, darkens with age, soluble in water, insoluble in alcohol; contains amount of salt corresponding to 10 p. c. of metallic iron. Valuable chalybeate; anaemia, etc. Should be kept dark, in well-stoppered, amber-colored bottles. Dose, gr. 1-5 (.06-.3 Gm.); Elixir, 3.5 p. c, +; Elixir Ferri Pyrophosphatis, Quininae et Strychnin;e; Elixir Ferri, Quininae et Strychninae.

20. Ferri et Strychninae Citras. Iron and Strychnine Citrate, official 1870-1910. - Obtained by dissolving iron and ammonium citrate 98 Gm. in distilled water 100 Ml. (Cc); dissolve strychnine 1 Gm. + citric acid 1 Gm. in distilled water 20 Ml. (Cc), mix solutions, evaporate to syrup, dry on glass. It is in thin, transparent, garnet-red, yellowish-brown scales, odorless, bitter, ferruginous taste, deliquescent, soluble in water, partially in alcohol; contains .9-1 p. c of strychnine, and amount of salt corresponding to 16 p. c. of metallic iron; chars into ferric oxide, which should not be alkaline (abs. of citrates, tartrates of alkali metals). Should be kept dark, in well-stoppered bottles. Dose, gr. 1-5 (.06-.3 Gm.), in pill, solution.

21. Ferri Peptonas. Iron Peptonate. - Obtained by mixing solution of dialyzed iron (24) with water (200), adding this, constantly stirring, to dry peptone (2) dissolved in water (200); add to this 1.5 p. c. solution of sodium hydroxide to precipitate iron peptonate; contains 25 p. c. of iron. Chlorosis, anaemia. Has the advantages of slight astringency and corrosive effect upon the teeth, mucous membranes, etc. Dose, gr. 3-10 (.2-6 Gm.).