Images in medieval and early modern treatises on medicine, pharmacy, and natural history often confound our expectations about the functions of medical and scientific illustrations. They do not look very much like the things they purport to portray; and their actual usefulness in everyday medical practice or teaching is not obvious. By looking at works as diverse as herbals, jewellery, surgery manuals, lay health guides, cinquecento paintings, manuscripts of Pliny's Natural History, and Leonardo's notebooks, Visualizing Medieval Medicine and Natural History, 1200-1550 addresses fundamental...