The natural and the supernatural in the Middle Ages : the Wiles lecture given at the Queen's University of Belfast, 2006 / Robert Bartlett.

Cambridge ; New York : Cambridge University Press, 2008.

x, 170 pages : illustrations ; 24 cm.

Includes bibliographical references (p. 149-164) and index.

The boundaries of the supernatural -- "The machine of this world" : ideas of the physical universe -- Dogs and dog-heads : the inhabitants of the world -- "The secrets of nature and art " : Roger Bacon's Opus maius.