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;
Elixir of calisaya with citrate of protoxide of iron, 16 fluidounces.
Strychnine, 1 1/4 grains.
Acetic acid, a sufficient quantity.
Triturate the strychnine in a mortar, cautiously adding acetic acid until it is dissolved, then mix with the elixir of calisaya and citrate of protoxide of iron.
Each fluidrachm (teaspoonful) of the finished elixir contains of citrate of protoxide of iron an amount which is equivalent to two grains of sulphate of iron and one-hundredth of a grain of strychnine, and represents about three grains of calisaya bark. This preparation is unstable.