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;
Salicin, 256 grains.
Simple elixir, 12 fluidounces.
Distilled water, 4 fluidounces.
Boil the water and dissolve in it the salicin, and mix this solution with the simple elixir. Filter if necessary.
Each fluidrachm (teaspoonful) of the finished elixir contains two grains of salicin.