This section is from the "Elixirs And Flavoring Extracts. Their History, Formulae, & Methods of Preparation" book, by John Uri Lloyd. Also available from Amazon: Elixirs and flavoring extracts,: Their history, formulae, and methods of preparation;
Fluid extract of rhamnus purshiana, 4 fluidounces.
Simple elixir, 14 fluidounces.
Alcohol, 1/2 fluidounce.
Carbonate of magnesium, a sufficient quantity.
Triturate the fluid extract of rhamnus purshiana in a capacious mortar with carbonate of magnesium in amount sufficient to form a creamy mixture, then gradually add the simple elixir, stirring well, and filter. Lastly, mix the filtrate with the alcohol.
Each fluidrachm of the finished elixir represents fifteen minims of fluid extract of rhamnus purshiana.
In former editions of our publication each fluidrachm of the elixir represented seven and one-half grains of rhamnus purshiana. We have changed the proportion to accord with the strength established by the National Formulary.