Thanks are due to my students for making me think about this book and to my contributors for agreeing to write it. They have been wonderfully responsive throughout. My editor, Heather McCullum is leaving Routledge just as this book is completed, bringing to an end several years of an excellent working relationship. I am indebted to her and to her colleagues for the enthusiastic and efficient way in which they have helped bring this volume to completion.
30 September 1999