How can the Body and Blood of Christ, without ever leaving heaven, come to be really present on eucharistic altars where the bread and wine still seem to be? Thirteenth and fourteenth century Christian Aristotelians thought the answer had to be "transubstantiation." Acclaimed philosopher, Marilyn McCord Adams, investigates these later medieval theories of the Eucharist, concentrating on the writings of Thomas Aquinas, Giles of Rome, Duns Scotus,...