PROPERTIES.--A greyish-white powder, slowly but completely soluble in water, without odor, and having a saline styptic taste. DOSE.--Same as reduced iron. FERRI CARBONAS SACCHARATUS--SACCHARATED FERROUS CARBONATE DERIVATION.--Ferrous sulphate, 50; sodium bicarbonate, 35; sugar and distilled water. Made by solution, precipitation and washing. PROPERTIES.--Greenish-brown powder, without odor; sweetish taste; becomes oxidized on exposure to the air. DOSE.--Horses, 2 to 4 dr.; cattle, ¹⁄₂ to 1 oz.; sheep and pigs, ¹⁄₂ to 1 dr.; dogs, 2 to 10 gr. SYRUPUS FERRI IODIDI--SYRUP OF FERROUS IODIDE Contains five per cent, by weight, of ferrous iodide. PROPERTIES.--Transparent, pale green liquid; sweet, ferruginous taste. DOSE.--Horses, ¹⁄₂ to 1 oz.; cattle, 1 to 2 oz.; sheep and pigs, 1 to 2 dr.; dogs, 5 to 30 m. Given when you want the combined action of iron and iodine. ACTION.--Tonic, alterative, diuretic and emmenagogue. FERRI CHLORIDUM--FERRIC CHLORIDE Ferric chloride should contain not less than 22 per cent of metallic iron in the form of chloride. PROPERTIES.--It is in orange-yellow, crystalline pieces, odorless or having a faint odor of hydrochloric acid and a strong styptic taste; deliquescent; soluble in water and alcohol; not used internally. Used almost exclusively in the form of tincture or liquor, and in reference to its effect and application I refer you to Tincture Ferri Chloridi and Liquor Ferri Chloridi. LIQUOR FERRI CHLORIDE--SOLUTION OF FERRI CHLORIDE DERIVATION.--Dissolve iron wire, 125, in hydrochloric acid, 680, nitric acid and water to make 1000. PROPERTIES.--A reddish-brown liquid, having a faint odor of hydrochloric acid, an acid, strongly styptic taste. DOSE.--Horses and cattle, 2 to 4 dr.; sheep and pigs, 10 to 20 m.; dogs, 2 to 10 m. All liquid preparations of iron should be well diluted with water or oil. TINCTURA FERRI CHLORIDI--TINCTURE OF FERRIC CHLORIDE Composed of ferric chloride, 350 parts; alcohol to make 1000. DOSE.--Horses and cattle, 1 to 2 oz.; sheep and pigs, 20 to 30 m.; dogs, 5 to 30 m. LIQUOR FERRI SUBSULPHATIS--SOLUTION OF FERRIC SUBSULPHATE--MONSEL’S SOLUTION A solution of sulphate of iron, sulphuric and nitric acids. PROPERTIES.--A dark reddish-brown liquid, odorless or nearly so; of an acid, strongly styptic taste; miscible in water and alcohol. DOSE.--Horses and cattle, 2 to 4 dr.; sheep and pigs, 10 to 20 m.; dogs, 2 to 10 m. This is used almost entirely for external use as an astringent and styptic. There are 36 official preparations of iron and a number of unofficial preparations, quite a few of which are impracticable for use in veterinary medicine, consequently we have considered only those which are practicable for use. Some are more irritating than others and some have special actions due to other drugs combined with the iron. GENERAL ACTION OF IRON AND ITS SALTS