Medicines, their uses and mode of administration : including a complete conspectus of the three British pharmacopoeias, an account of all the new remedies, and an appendix of formulae / by J. Moore Neligan.
- John Neligan
- Date:
- 1849
Licence: Public Domain Mark
Credit: Medicines, their uses and mode of administration : including a complete conspectus of the three British pharmacopoeias, an account of all the new remedies, and an appendix of formulae / by J. Moore Neligan. Source: Wellcome Collection.
Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)
31/504
![and in some instances, a solution of sulphate of soda is substituted for it. By the following simple method proposed by Mr. Redwood, of London, the precise quantity of carbonate of magnesia contained in it may be readily ascertained :—Evaporate a fluid ounce of the solution to dryness in a wedge-wood dish ; calcine the residue at a red heat for about five or ten minutes, in a small Berlin crucible ; then weigh the calcined residue. If this residue be pure calcined magnesia, every five grains of it will be equivalent to twelve grains of the hydrated carbonate of magnesia of commerce ; after weighing the calcined residue, treat it with distilled water, when, if there beany soluble salts present, they will be dissolved out and may be tested, weighed, and the amount deducted from the weight of the magnesia.—Trochisci Magnesia, E. (Carbonate of magnesia, §vi. ; pure sugar, §iij. ; nut- meg, 9i. ; beat them in powder, with mucilage of tragacanth, to a mass for lozenges.) In acidity of the stomach, ad libitum. Incompatibles.—Acids ; acidulous, and metallic salts ; muriate of ammonia ; and lime water. POTASS^E CAUSTICS AQUA, D. LlQUOR POTASSJE [U. S.] L. PoT- ass-J: aqua, E. Water of caustic potash; Solution of potash. Preparation.—[U. S. Take of Carbonate ofpotassalbj; lime, Ibss ; boil- ing distilled water cong j. Dissolve the carbonate ofpotassa in half a gallon of the water. Pour a little of the water on the lime, and when it is slaked add the remainder. Mix the hot liquors, and boil for ten minutes stirring constant- ly; then set the mixture aside, in a covered vessel, until it becomes clear. Lastly, pour off the supernatant liquor, and keep it in well-stopped bottles of green glass.]—Dub.— Carbonate of potash, from potashes of commerce ; and recently burnt lime, of each, two parts; water, 15 parts; sprinkle one part of the water made hot on the lime in an earthen vessel, and as soon as it is slaked, mix with the salt and add the remainder of the water. Put the mixture when cool into a well-stopped bottle, and agitate frequently for three days; as soon as the carbonate of lime has subsided, pour offthe clear liquor, and preserve in carefully stopped green-glass bottles. Lond.— Carbonate of potash, §xv ; lime, §viij; boiling distilled water, cong.j; dissolve the carbonate of potash in half a gallon of the water; sprinkle a little of the water upon the lime in an earthen vessel, and the lime being slaked, add the rest of the water. The liquors being immediately mixed to- gether in a close vessel, shake them frequently until they are cold ; then set aside, that the carbonate of lime may subside. Lastly, keep the supernatant liquor when poured off, in a well-stopped green-glass bottle. Edin.— Carbonate of potash (dry), §iv; lime, recently burned, §ij; water, fgxlv; let the lime be slaked, and converted into milk of lime with fgvij of the water; dissolve the carbonate in the rest of the water ; boil the solution, and add the milk of lime in successive portions, about an eighth at a time— boiling briskly for a few minutes after each addition. Pour the whole into a deep, narrow glass vessel for 24 hour3, and then withdraw with a syphon the clear liquid, which ought to amount to at least f^xxx. and should have a density of 1072. As solution of potash corrodes flint glass, it is directed in the pharmacopoeias to be kept in green-glass bottles. Physical Properties.—A transparent colourless liquid, with an oily appearance, and a soapy feel ; it is odourless, but has an intensely acrid alkaline taste. Its specific gravity is different in the three British Pharmacopoeias ; that of the Dub. preparation is L080 that of the Lond. T063, and that of Edin. 1072. [The U. S. Pharmacopoeia directs it of the sp. g. of 1.056.] y^>j^o . .](https://iiif.wellcomecollection.org/image/b21143602_0031.jp2/full/800%2C/0/default.jpg)
