The early-16th-century manuscript commonly known as the Geese Book (New York, Morgan Library, M. 905) contains the entire Mass liturgy sung by the boys choir of the parish church of St. Lorenz in Nuremberg, Germany prior to the Reformation. This thesis addresses the location and function of the sometimes enigmatic marginalia and the decorated or historiated initials in this large two-volume gradual. The paper begins with an analytical case study of a scene within the margins in which a wild woman, wielding a club, confronts a female dragon who has taken a child. Subsequently the size, subject matter, and physical positioning of the illuminations and decorations within the book and on its pages are examined with respect to the gradual's liturgical contents. It is hoped that through such methods, new conversations may begin as to the roles that marginalia and decoration may play within the multiple organizational schemes within a musical text of this kind.

Morgan Library MS M.905 (the Geese Book) is the last known illuminated gradual produced for the Church of St. Lorenz in Nuremberg, Germany. The Geese Book, which was created during the early sixteenth century, has been in the collection of the Morgan Library since 1961. This thesis describes the iconography of the eight historiated initials that illustrate the earthly life of Christ from the Annunciation to the Ascension. A detailed description of the content of each initial is followed by a brief history of the iconographic development of the identified event in order to determine whether or not the Geese Book uses a standard or nonstandard iconography. The results of this analysis reveal how this manuscript fits into the broader contexts of Christian art as well as the specific time and place of its creation. It shows that the iconography of the Geese Book reflected current theological beliefs and societal norms and allowed contemporary viewers of the Geese Book to feel a strong connection to the depicted events.