I cannot begin to thank all the individuals and institutions without whom this work would never have seen the light of day. However, I would like particularly to express my gratitude to the staffs at the Salle des Manusaits of the Bibliothèque Nationale, Paris; the Bibliothèque Saulchoir, Paris; the Bibliothèque Mazarine, Paris; the Bibliothèque Municipale, Laon; the Bibliothèque Municipale, Valenciennes; the United Libraries of Seabury Western and Garrett Evangelical Semi- naries, Evanston; the Bayerische Staatsbibliothek, Munich; and the Bibliothèques Municipales of Tours and Troyes, which welcomed me when I first began this study many years ago.