In this talk, Stefanie Gänger (Köln) explores the history of 'cinchona' or 'Peruvian bark', one of the most widely used medicines of the late 18th and early 19th centuries. She looks at how knowledge about the plant travelled across continents and found its way into the medicinal practices of slaves, paupers and nobles. The talk is followed by a short comment from Sarah Easterby-Smith (St Andrews). This is a recording of an event hosted by the CSMCH in March 2019.