* * * The manuscripts F-Pn Lat. 15181 and 15182, the Winter and Summer halves of a noted breviary designed for use at Notre Dame Cathedral, were probably copied in Paris around the year 1300. The feast of Corpus Christi as well as a few rubrics and marginal chants (e.g. the Responsory "Fluenta evangelii"/Verse "Beatus vir," and Antiphon "Exiit sermo" for John the Evangelist) seem to be later additions. The index of Paris Lat. 15181 follows the modern set of folio numbers in Arabic numerals, in the upper right hand of each recto. This numbering includes 10 folios (a kalendar and some liturgical texts) added to the front of the codex, excluded from the system of Roman numerals in the main body of the codex. The number 401 has been used twice in the Arabic page numbers, a mistake not represented in the Roman numerals. Although a kalendar (six folios in length) was also added to the front of Paris Lat. 15182, and was likewise numbered in Arabic numerals, the more recent Arabic numbering system was not extended to the rest of the codex. Therefore, the index of Paris Lat. 15182 follows the page numbering in Roman numerals, in the upper right hand of each recto, found only in the main body of the codex. Due to the random addition of a stray "x" at one point, this numbering skips from 168 to 179, a mistake duplicated in the index (in the Office for the Dedication of a Church). In addition, the number 304 is used twice. The manuscripts contain a substantial number of chants and Offices not found in CAO (indicated with an asterisk in the contents of each book, see above). Each chant not found in CAO has been assigned an arbitrary number beginning with "nda". The breviary also includes a number of Offices in full or partial modal order: in Paris Lat. 15181, Nicholas, Immaculate Conception, John the Evangelist, Vincent, and Annunciation; in Paris Lat. 15182, Trinity, Corpus Christi, Finding of Stephen, Crown of Thorns, Augustine, Giles, Nativity of Mary, Matthew, Genulf, and Catherine. Along with chants for the Daily Office, Paris Lat. 15181 and 15182 prescribe numerous chants for processions and memorials. The processional items, typically a responsory to be sung whenever the feast fell on a Sunday (and would then be celebrated with a procession) but occasionally a responsory and antiphon, are assigned the letter "X" in the Genre column. Rubrics may contain additional information about processions, such as indications about performance practice (e.g. a direction to sing in organum the verse in the processional responsory for the Assumption and the Nativity of the Virgin Mary) and/or routes and destinations of the procession itself. Memorial items, typically an antiphon and versicle, are indicated by the letter "R" in the Position column when the memorial is sung at the end of Lauds or Vespers; when the precise liturgical context is uncertain, or when the memorial is intended to be sung at various times during the season or year, the items are indicated by the letter "R" in the Office column. There are a total of thirty-two differentiae: seven each for modes I and IV (two of the mode IV differentiae appear only in transposed versions); four each for modes III, VII, and VIII, two for mode II (the second of these is employed only with the "O" antiphons of Advent), and a single differentia for modes V and VI. The differentiae have been assigned arbitrary numbers for the purposes of classification. There are twelve different invitatory tones used in Paris Lat. 15181 and 15182. These have been identified using the Cantus system of numbers and two-letter sigla. Although these tones are associated with antiphons in modes II through VII, they are most frequently used in conjunction with antiphons in modes IV and VI.
Leroquais, Victor. Les Breviaires: manuscrits des Bibliotheques publiques de France, 3: 260-62. Paris; Macon: Protat Freres, 1934.