Fluid extract of frangula, 4 fluidounces.

Alcohol, 1 fluidounces.

Simple elixir, 14 fluidounces.

Carbonate of magnesium, a sufficient quantity.

Triturate the fluid extract in enough magnesium carbonate to form a creamy mixture, then add the simple elixir, and filter. Each fluidrachm represents fifteen grains of buckthorn.