Gentian, 2 1/2 troyounces.

Serpentaria, 1 troyounce.

Bitter orange peel, 1 1/2 troyounces.

Calamus, 1/4 troyounces.

Diluted alcohol, 6 pints.

Reduce the drugs to a coarse powder, and macerate this in the diluted alcohol for fourteen days, stirring the mixture thoroughly each day, then filter. (Supplement to the London Pharmacopoeia.)