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 grindelia robusta, 1 fluidounce.
Simple elixir, 15 fluidounces.
Alcohol, 1/2 fluidounce.
Carbonate of magnesium, a sufficient quantity.
Triturate the fluid extract of grindelia 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 such an amount of seven and one-half minims of fluid extract of grindelia robusta as will dissolve in the menstruum. Grindelia robusta contains a resin which is precipitated by water; hence we do not consider an elixir of this plant to be desirable.
The National Formulary adopted the foregoing strength, and we confirm that proportion. In former editions of our publication we have used twice that amount of grindelia.