France or Low Countries. Parchment, i (unfoliated leaf of the Gradual, once pasted down to its former binding) + 175 fols. + 1 (34.0 x 24.5 cm), 1-1412, 1512-5? (lacks seemingly 5 leaves, with a gap between 2 and 3, and one after 7); 10 large illuminated initials (2-3 staves each) in gold (shell), blue, rose, green, and other colors (following the incorrect foliation in the manuscript): 1v, 14r, 16r, 80r, 93v, 96r, 123v, 143v, 145r, 148r; written space, 24.5-25.0 x 16.0 cm, ruled in blind and purple lines for 9 lines of 4-line staves in red, with square notation and accompanying text, text in black ink in a very regular Textualis bookhand, later foliation (16-17th century) in black ink in upper right corners, which begins incorrectly, omitting 1 (designated fol. i in this description) and repeating fol. 141). Rubrics in red, calligraphic versals touched in red, alternating flourished 1-line penwork initials in red and blue, most with penwork extensions spanning the height of the page in the margins. The initials are on diapered backgrounds with tendriled vine and ivy foliage, often incorporating images of dragons. Occasional sewing repairs of the parchment (e.g. fol. 55). Some staining and occasional repairs (mostly using paper-fragments from early printedf books in Latin), few holes caused by ink corrosion, annotations in the margins ranging from 14th- to 17th- or even 18th-century additions, including occasional guide letters.