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;
Quinine (alkaloid), 128 grains.
Strychnine, 1 1/4 grains.
Simple elixir, phosphoric acid (U. S..P., 1872), of each a sufficient quantity.
Triturate the powdered strychnine in a mortar with two fluidounces of simple elixir, and dissolve by addition of a sufficient amount of phosphoric acid. Now add the quinine (previously powdered), and then, continuing the trituration, gradually add of phosphoric acid an amount sufficient to dissolve the quinine. Then mix this solution with a sufficient amount of simple elixir to make the whole measure sixteen fluidounces, and filter if necessary.
Each fluidrachm (teaspoonful) of the finished elixir contains of phosphate of quinine and phosphate of strychnine an amount which is equivalent to one grain of quinine and one-hundredth of a grain of strychnine.