916

Appendix.

R TXilfi sulphatis,

Pliembi superacetatis aa gr. x.Aquas RoS(e t

-------- Sambuci aa fjiii.

Fiat colyrium subinde utendum.In ophthalmia after local bleeding

R Phnnbi superacetatis gr. ix.Aquw Rosas I3VSS.Aceti distillati f 5111.Spiritus rectificati f$i*Misce ntjiat colyrium scepe -utendum.In the acute stage of ophthalmia.

Embrocations.

Stimulant.R Liniraenti Ammonia?forlioris f5 v ^

Olivw olei f3ii.

Fiat embrocatio, cum panno laneo,fattcibus extends applicanda.

In cynanche tonsillaris.

Stimulant and Anodyne.11 JAnimenti Camphorce comp. f5ix.

Tinctures 'Lyttas f^i.

-------------- Opii f^ii.

Parti dolenti applicandum.

To be rubbed over the bowels incolic, cramp, and in painful affectionsof the joints.

PoWl

R Pulveris gummi Acacia gss.

Aluminis gr. v.

Misce diligentissime ut Jiat puluis,cujus inspergatur pauxillum super ma-millas pro re nata.

In sore nipples, to be applied aftersuckling.

R Superacetatis plumbi 51.

Pulveris Cinchona 5V11.

Tere, ut Jiat pulvis, cujus pauxillumsuper ulceres omni inane spergalur.

For scrophulous ulcers.

Ointments.

R Hydrargyri nitrico-oxydi 9ii. R Zinci oxydi 3i.

Adepts gi. Adepts Ji.

Tere diligenter in mortario, donee Tere optima in ?nortario t utjiat ungu-

bene misceantur. enlum.

In ulcerations of the eyelids. In tinea capitis.

No. IV.

HYDRO-CYANIC (PRUSSIC) ACID.

The introduction of Prussic acid as an article of Materia Medica; and the ex-tensive employment of it, in London, since it was first introduced in 1815, requirethat some notice should be taken of it in this work.

Preparation. The best method of preparing Hydro-cyanic acid, for medicinaluse, is the following, which was first employed by Scheele.

Mix two ounces of Prussian blue with six ounces of red precipitate of mercury,and add six ounces of water. Boil the mixture for some minutes, constantlyagitating it, when the blue colour will disappear, and the mass assume a yellowishgrey hue. Pour the whole on a filter, and wash the residuum with a little hotwater, which is to be added to the filtered liquor. Pour this upon an ounce and