RISM B/IV 2: An early 15th century French paper manuscript meas. 300 x 215 mm. and containing 56 folios + 1 blank unnumbered ribbed paper folio at each end belonging to the binding of plain beige paper over compressed cardboard. The spine is of thin leather with gilt tooling, and bears the title "ORDINATI[O] || OFFICII|| ECCLESIAE". 3 more blank unnumbered folios, this time original, follow f. 56 and precede the binding flyleaf. The contents of this ms are: a letter from rabbi Samuel to rabbi Isaac translated from Arabic to Latin by Alphonse Bonhomme, a Spanish Dominican, in 1339 (f. 1-23); De ordinatione officii misse (f. 23-31v); a short musical treatise on the notes of the scale, differentiae, psalm-tones and some mensural signs (f. 33-34v); stock formulae for the psalm-tones and Gloria patri (f. 34v-36); the three-part "Kyrie Tro summe clementissime" by Johanes Graneti also preserved in E-Boc 2 and F-APT 16 bis (f. 36v); a unique treatise De semibrevibus caudatis (f. 37-40); a treatise on Latin accent (f. 41-42); and the Legenda aurea of Jacobus da Varagine (f. 43-56v), which lacks the ending. A page evidently containing polyphonic music once preceded f. 33, but was cut out. The remains of 9 brown five-line staves can still be seen. The polyphonic Kyrie is in Ars Nova notation on 8 red five-line staves. Fol. 34v-36 have 9 red four-line staves per page, with breves, semibreves, ligatures and occasional longs for the plainsong on f. 34v-35. The treatise De semibrevibus caudatis employs brown three- or four-line staves (or even less lines) with black, red and white notes. The codex seems to come from the Valais, to judge from references in a 15th century hand on f. 42v. The signature is that of Guigonis Emodruti, the date 1431.
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