Fluid extract of coto, 2 fluidounces.

Simple elixir, 16 fluidounces

Carbonate of magnesium, a sufficient quantity.

Triturate the fluid extract of coto with magnesium carbonate until a creamy mixture results, then gradually add the simple elixir, and filter. Each fluidrachm of this elixir represents such an amount of seven and one-half grains of coto as will dissolve in the liquid.