A seminar on the nature, varieties and powers of signs as defined and evoked in the philosophy, theology, and poetry of the Middle Ages. Subjects to be discussed include typologies of natural and artificial signs, theories of imposition, analogy and equivocation, self-signification, and "efficacious" meaning. Case studies are furnished by the sacraments, romance obscenities and euphemisms, proper names, Tristan and Yseut's "potion," Lancelot's cart, and the dates of Villon's Testament.