Finally, I wish to express my gratitude to three people who were critical to the suc cess of the symposium and to the physical production of this book. Nancy Gee attend ed completely to all the logistics of the symposium, and in doing so relieved me of an immense responsibility. The success of the symposium itself was made possible by her expert efforts in organizing transportation and accommodation for the participants, and in making all the arrangements for the symposium itself. Vivian Young was responsible for the design of the book cover and the chapter format, both of which take their inspi ration from her designs for the symposium brochure and program. It was a joy to work with such a gifted artist. Rachel Wolf, who has acted as my editorial assistant in the pro duction of this book, was responsible for the immense tasks of corresponding with the authors on editorial matters, and formatting and typesetting the book in preparation for publication. The beautiful layout of the text and illustrations, and the punctiliously edit ed text owe everything to her unflagging and good-humored efforts. I hope that you find this book as rich and stimulating to read as I found it to edit.