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;
Oil of wintergreen, 1 fluidounce.
Alcohol, 15 fluidounces.
Mix them together.
This extract may be made of the fresh berries, but not of the flavor strength produced by the foregoing formula. There is perhaps a freshness in the extract that is made of the berries that is wanting in the solution of the oil, but few persons, however, can procure fresh wintergreen berries. In selecting oil of wintergreen, it is to be borne in mind that the commercial oil is likely to be either oil of white birch or synthetical oil.