The term "literary alchemy" dates back to at least 1971, when Jennifer R. Walters used it as the title of her essay Literary Alchemy in Diacritics magazine. Stanton J. Linden, in his 1996 Darke Hierogliphicks; Alchemy in English Literature from Chaucer to the Restoration, applies the term both to stories which deal extensively with alchemists and the process of alchemy (of which the earliest is Chaucer's The Canon's Yeoman's Tale), and stories which include alchemical allegory or imagery (of which the most extensive and well-known is the Chymical Wedding of Christian Rosenkreutz). John Granger, who studies the literary alchemy in J. K. Rowling's, Harry Potter series explains: