Druckschrift 
The London Dispensatory, containing : 1. the Elements of Pharmacy ; 2. the botanical Description, natural History, chemical Analysis, and medicinal Properties of the Substances of the Materia Medica ; 3. the pharmaceutical Preparations and Compositions of the Pharmacopoeias of the London, Edinburgh, and Dublin Colleges of Physicians ; the Whole forming a Practical Synopsis of Materia Medica, Pharmacy, and Therepeutics
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712

Plasters.

part III.

the theory, nor indeed utility, of burnt hart's horn for any pur-pose as a remedy.

Officinal preparation. Mistura Cornu usti. L.SPONGIA USTA. JLond. Burnt Sponge." Cut sponge into small pieces and bruise it, in order tofree it from any adhering extraneous substances; then burn itin a covered iron vessel, until it become black and friable;finally, rub it to a very fine powder."

The properties of fresh sponge have been already noticed :when burnt, the residue consists of carbonate and phosphateof lime, subcarbonate of soda, and charcoal. The principalactive ingredient is the subcarbonate of soda, but it is assertedthat a mixture of this principle and charcoal does not producethe effects of burnt sponge.

Medical properties and uses. — Burnt sponge is tonic, deob-struent, and antacid. It has been much recommended inbronchocele, scrophulous affections, and herpetic eruptions :and I have witnessed its efficacy in scirrhous testicle, whengiven in combination with cinchona bark. The dose is from5j- to ^iij. mixed into the form of an electuary, with powderedcinnamon and honey. In bronchocele the patient is directedto swallow the portion of electuary very slowly, from a sup-position that some local effect is produced.

TEST/E PR^EPARATiE. Lond. Prepared Shells."Wash the shells with boiling water, having previouslyfreed them from extraneous matters, then prepare them in themanner directed for the preparation of chalk."OstrearumTest.33 pR.aEPARAT.as.Dub. PreparedOysier Shells." These are to be prepared in the same manner as chalk."OVORUM TESTiE PRyEPARATiE. Dub. Prepared■ Egg Shells.

" These are to be prepared in the same manner as chalk."Both in oyster and egg-shells the predominating ingredientis carbonate of lime, and therefore these prepared shells do notdiffer from chalk, except in containing a small portion of gelatinor albumen. But as this does not in any degree affect theirmedicinal properties, which are exactly the same as those ofchalk, they might well be spared from the lis/ of preparations.The dose is from grs, x. to 3y. or more.

EMPLASTRA.

Plasters.

These are solid, tenacious compounds, adhesive in the or-dinary heat of the human body. The base of the majority of

 
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