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;
Sulphate of quinine, 128 grains.
Simple elixir, 16 fluidounces.
Dilute sulphuric acid, a sufficient quantity.
Mix the sulphate of quinine with four fluidounces of simple elixir, and add enough dilute sulphuric acid to effect its solution. Then add the remainder of the simple elixir, and filter if necessary.
Each fluidrachm (teaspoonful) of the finished elixir contains one grain of sulphate of quinine.
The addition of the excess of sulphuric acid actually produces bisulphate of quinine; hence the term elixir of bisulphate of quinine is admissible, although sulphate of quinine is employed.