Gelatum Naphthol-Beta

As 10 per cent, gelat. iodoformi, but with beta-naphthol. 3V.

Gelata Zinci Varia

To the quantities for the hard jelly may be added 1 oz. of tar or of extract of cannabis or of resorcin; to the common, 1 oz. precipitated sulphur or 1/2 oz. to I oz. of ichthyol.

These jellies were at one time alternatively called 'pastes,' but Dr. Unna has, since their introduction about 1886, prescribed other preparations more correctly termed 'pastes.' These closely resemble glycerin of starch, the ointment-basis substitute introduced by the late Mr. G. F. Schacht and officialised by the British Pharmacopoeia. Others are based upon Lister's original carbolic paste (prepared chalk made into a paste with carbolic oil). The following formulae, which are reprinted from 'Pharmaceutical Formulas,' are the more commonly required preparations:

Pasta Ichthyol

(Unna).

Dissolve the ichthyol in the water and the glycerin, mix with the dextrin, and heat on a water-bath until uniform.

Mix.

This is the basis, and it is medicated with various substances, such as resorcin (2 per cent.).

Pasta Naphthol

(Lassar).

Mix the powders, add the vaseline and soap, and mix thoroughly.

Pasta Plumbi

(Unna).

Boil together until the solution is syrupy, then add-

Again boil, and add -Glycerin

Mix, and heat if necessary until the paste weighs 5 oz.