This section is from the book "A Treatise On Beverages or The Complete Practical Bottler", by Charles Herman Sulz. Also available from Amazon: A Treatise On Beverages.
The essential oils obtained directly from the raw materials are called "simple," while those consisting of several oils are called "compound". The latter are preparations principally used in the manufacture of liquors, soaps and perfumery. For the manufacture of liquors, alcoholic essences can advantageously be used. Artificial essential oils are also prepared as purely chemical compounds.