622 Preparations and Compositions. Part III.

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Chap. XXXVIIL—TROCHES.

Tkoches and lozenges are composed of powders made upwith glutinous substances into little cakes, and afterwardsdried. This form is principally made use of for the morecommodious exhibition of certain medicines, by fitting themto dissolve slowly in the mouth, so as to pass by degrees intothe stomach, or to act upon the pharynx and top of thetrachea ; and hence these preparations have generally a con-siderable proportion of sugar, or other materials grateful tothe palate. Some powders have likewise been reduced intotroches, with a view to their preservation ; though possiblyfor no very good reason ; for the moistening, and afterwardsdrying them in the air, must rather tend to injure than topreserve them. The lozenges of the confectioner are so su-perior in elegance to those of the apothecary, that they arealmost universally preferred ; and hence it probably is that theDublin and London colleges have entirely omitted them.

Trochisci carbonatis calcis. Ed.Troches of Carbonate of Lime.Take of

Carbonate of lime, prepared, four ounces -,Gum arabic, one ounce ;Nutmeg, one drachm ;Refined sugar, six ounces.Powder them together, and form them with water into a massfor making troches.

These are used against acidity of the stomach, especiallywhen accompanied with diarrhoea.

Trochisci glycyrrhizje glabra. Ed.Troches of Liquorice.Take of

Extract of liquorice,Gum arabic, each one part;White sugar, two parts.Dissolve them in warm water, and strain ; then evaporate thesolution over a gentle fire, till it be of a proper consistencefor being formed into troches.