Dr. Pereira's Elements of materia medica and therapeutics : abridged and adapted for the use of medical and pharmaceutical practitioners and students and comprising all the medicines of the British Pharmacopœia, with such others as are frequently ordered in prescriptions or required by the physician / edited by Robert Bentley and Theophilus Redwood ; with an appendix.

Jonathan Pereira

Date:: 1874

Credit: Dr. Pereira's Elements of materia medica and therapeutics : abridged and adapted for the use of medical and pharmaceutical practitioners and students and comprising all the medicines of the British Pharmacopœia, with such others as are frequently ordered in prescriptions or required by the physician / edited by Robert Bentley and Theophilus Redwood ; with an appendix. Source: Wellcome Collection.

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$acid, corresponding to 10 per cent, by weight of ammonia, NH3 or N H3. One fluid drachm contains 52 grains of ammonia.] Administration.—This solution of ammonia is the one commonly employed for internal use. Dose, ten to thirty minims properly diluted. It is also used externally in the form of liniment. [§ Linimentum Ammonise. Liniment of Ammonia. Take of Solution of Ammonia. . . .1 fluid ounce. Olive Oil ...... 3 fluid ounces. Mix together with agitation.] [§ Ammoniae Carbonas. Carbonate of Ammonia. Synonym.—Ammonias Sesquicarbonas, Lond. Dub. 2NH40,3C02 or ff4H16C308 A volatile and pungent ammoniacal salt, produced by submitting a mixture of sulphate of ammonia or chloride of ammonium and car- bonate of lime to sublimation. Characters and Tests.—In translucent crystalline masses, with a strong ammoniacal odour, and alkaline reaction; soluble in cold water, more sparingly in spirit. It volatilises entirely when heated, and is readily dissolved by acids with effervescence. If diluted nitric acid be added to it in slight excess, and the solution be boiled, it will give no precipitate with chloride of barium or nitrate of silver. 59 grains dissolved in one ounce of distilled water Avill be neutralised by 1,000 grain-measures of the volumetric solution of oxalic acid. 20 grains of I t 1 -f grains Citric acid Carbonate of Ammonia J \ 25J grains Tartaric acid.] Preparation.—Manufacturers prepare it by submitting to subli- mation a mixture of sal ammoniac, or impure sulphate of ammonia, and chalk. In a manufactory which I inspected a few years since it was prepared as follows :—The retorts in which the sublimation is effected are of cast iron, and similar in shape and size to those em- ployed in the manufacture of coal gas. Each retort communicates posteriorly with a leaden receiver, with which is connected a second receiver of the same size and shape. The receivers have the form of square prisms placed endways, and are supported in a wooden frame-work. In some manufactories they are cylindrical, and have movable tops and bottoms. The impure carbonate thus obtained is contaminated writh carbonaceous matter, which it deposits when dissolved in acids. It is redistilled in iron pots surmounted with leaden heads, and heated by the flue of the retort furnace. A little water is introduced into the pots to render the sesquicarbonate translucent. In some cases the pots are heated by a water bath ; a$

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