Troches and lozenges are powders mixed up with glutinous substances into little cakes, and afterwards dried. The lozenges of the confectioner are superior in elegance to those of the apothecary, thence the London and Dublin Colleges have properly ommitted them.

Trochisci Carbonatis Calcis. Edin. 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 mass for making troches."

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

Trochisci Carbonatis Magnesiae. Edin. Troches of Carbonate of Magnesia

"Take of carbonate of magnesia, six ounces; refined sugar, three ounces; nutmeg, one scruple. Powder them, and make them into a mass for troches, with mucilage of tragacanth.

Troches of magnesia are also used for acidity of the stomach.

Trochisci Glycyrrhizae Glabrae. Edin. Troches of Liquorice

"Take of extract of liquorice, gum arabic, each one part; refined sugar, two parts. Boiling water, a sufficient quantity. Dissolve and strain; then evaporate the solution over a gentle fire, till it be of a proper consistence for being formed into troches."

Trochisci Glycyrrhizae Cum Opio. Edin. Liquorice Troches with Opium

"Take of opium, two drachms; tincture of tolu, half an ounce; common syrup, eight ounces; extract of liquorice, softened with warm water, gum arabic, in powder, of each five ounces. Triturate the opium well with the tincture, then add by degrees the syrup and extract; afterwards gradually mix in the powdered gum arabic. Lastly, dry them so as to form a mass, to be divided into troches, each weighing ten grains.

1 Annales de Chimie, vol. lxxxiii. p. 157.

Seven and a half of these troches contain about one grain of opium. They are useful in tickling coughs depending on irritation of the fauces.

Trochisci Gummosi. Edin. 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 lozenge, calculated for allaying the tickling in the throat which provokes coughing.

Trochisci Nitratis Potassae. Edin. Troches of Nitrate of Potass

"Take of nitrate of potassa, one part; double-refined sugar, three parts. Rub together to powder, and form them, with mucilage of gum tragacanth, into a mass, to be divided into troches.

This an agreeable form for the exhibition of nitre; but if the quantity taken be considerable, it is apt to occasion uneasiness in the stomach.