Chap. XXXVIII. Of Troches.

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These are both agreeable pectorals, and may be used atpleasure in tickling coughs. The solution, and subsequentevaporation, of the extract of licjuorice,\directed by the Edin-burgh college, is exceedingly troublesome, and apt to givethe troches an empyreumatic flavour. They are more easilymade, by reducing the liquorice also to powder, and mixingup the whole with rose-water. Refined extract of liquoriceshould be used ; and it is easily powdered in the cold, afterit has been laid for some days in a dry, and rather warmplace.

Tkochisci glycvurhizjE cum opro. Ed.Liquorice Troches with Opium.

Take of

Opium, two drachms;

Tincture of Tolu, half an ounce;

Common syrup, eight ounces ;

Extract of liquorice, softened in warm water,

Gum arabic, in powder, of each five ounces.

Triturate the opium well with the tincture, then add by de-gress the syrup and extract; afterwards gradually mix in,the powdered gum arabic. Lastly, dry them so as to forma mass, to be divided into troches, each weighing teagrains.

These directions for preparing the above troches are sofull and particular, that no further explanation is necessary;seven and a half contain about one grain of opium. Thesetroches are medicines of approved efficacy in tickling coughsdepending on irritation of the fauces. Besides the mecha-nical effect of the viscid matters in involving acrid humours,or lining and defending the tender membranes, the opiumno doubt must have a considerable effect, by more immediate-ly diminishing the irritability of the parts themselves.

Tkochisci gummosi. Ed.Gum Troches.Take of

Gum arabic, four parts;Starch, one part;Refined sugar, twelve parts.Powder them, and make them into a proper mass with rose-water, so as to form troches.

This is a very agreeable pectoral, and may be used at plea-sure. It is crlculated for allaying the tickling in the throatwhich provokes coughing.

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