Book excerpt: This is the first detailed analysis of an immensely popular 13th c. Arabic guide for pharmacists, from a time in which Jewish physicians and pharmacists worked alongside Muslim and Christian practioners. "Minh j al-dukk n" ("How to manage a pharmacy"), by Ab l-Mun al-K h n al- A r (fl. 1260) is the first attempt to explore the full spectrum of pharmacy in the medieval Arabic world: identification of the materia medica and methods of preparation; pharmacy's place within the sciences and particularly its relationship with medicine; the social position of the pharmacist and his role in the marketplace and the hospital; the economics of pharmacy; legal aspects of pharmacy; and the image of the pharmacist in literature and drama. The result is a full and nuanced picture of a section of society usually invisible.