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The Edinburgh new Dispensatory : containing 1. The Elements of pharmaceutical Chemistry ; 2. The Materia Medica; or the natural, pharmaceutical and medical History, or the Substances employed in Medicine ; 3. The pharmaceutical Preparations and Compositions ; including Translations of the Edinburgh Pharmacopoeia published in 1805, of the Dublin Pharmacopoeia in 1807, and of the London Pharmacopoeia in 1815
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3¥2 Preparations and Compositions. Part III.

the subcarbonate attracts not only water, but carbonic acid.It is therefore improperly named. The name of the Londoncollege is correct, and the preparation nearly uniform in pointof strength. Dr Powell says, that the quantities ordered bythe college will commonly give a solution amounting to near-ly 18 ounces in bulk.

AoUA SUPERCARBONATIS POTASS^. Ed.

Solution of Super carbonate of Potass.

Take of

Water, ten pounds.Pure carbonate of potass, one ounce;Dissolve, and expose the solution to a stream of carbonic acid,arising from

Carbonate of lime in powder,Sulphuric acid, each three ounces;Water, three pounds, gradually and cautiously mixed.The chemical apparatus invented by Dr Nooth is well adapt-ed for this preparation. But, if a larger quantity of theliquor be required, the apparatus of Dr Woulfe is prefera-ble.The colder the air, and the greater the pressure, the betterwill the solution be, which must be kept in well-corked ves-sels.

As soon as the preparation is finished, the liquor should bedrawn off into pint bottles, which are to be well-corked, andkept in a cool situation, with the head down, or laid on oneside. It should be perfectly transparent, and have an acidu-lous, not at all alkaline, taste; and, when poured out of thebottles, it should have a sparkling appearance.

Medical use. —In this solution, carbonate of potass is com-bined with excess of carbonic acid, by which means it is bet-ter adapted for internal use, as it is rendered not only morepleasant to the taste, but is less apt to offend the stomach.Indeed, it is the only form in which we can exhibit potass insufficient doses, and for a sufficient length of time, to derivemuch benefit from its use in calculous complaints. It hascertainly been frequently of advantage in these affections, butprobably only in those instances in which the stone consistsof uric acid, or urate of ammonia ; for, although supersatura-ted with carbonic acid, yet the affinity of that acid for potassis so weak, that it really operates as an alkali.

Six or eight ounces may be taken two or three times a-day.It in general proves powerfully diuretic, and sometimes pro-

 
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