In this original, provocative, well-reasoned, and thoroughly documented book, Frank Klaassen proposes that two principal genres of illicit learned magic occur in late medieval manuscripts: image magic, which could be interpreted and justified in scholastic terms, and ritual magic (in its extreme form, overt necromancy), which could not. Image magic tended to be recopied faithfully; ritual magic tended to be adapted and reworked. These two forms of magic did not usually become intermingled in the...
