Fenner's Working Formulae: A Handbook of the Old and the New Pharmacopoeias (1884) is a comprehensive guide to the preparation of medicines according to the pharmacopoeias of the time. Written by Byron Fenner, a pharmacist and chemist, the book includes over 2,000 formulas for a wide range of drugs, including tinctures, extracts, ointments, and powders. The formulas are arranged alphabetically by drug name, and each entry includes detailed instructions...