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Acknowledgments I want to thank Jonathan Beale, Charles Guignon, Iain Thomson, Jim Edwards, Jon Cogburn, and John Koritansky for helpful comments and suggestions on drafts. Any errors are, of course, entirely their fault. An NEH Summer Seminar helped my early work on it. Andy Paiko made the beautiful glassworks which he graciously allowed me to use on the book’s cover. I also want to thank my editors, Philip Laughlin and Judy Feldmann, for making the process remarkably smooth and painless. And I thank my children , Sophia, Ben, and Julia for their patience, and my wife Yvonne, who benefits me in more ways than I could name. ...

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