Information on differentia
Differentiae are entered in-line, following each antiphon. They were originally indexed hierarchically by mode using an alpha-numeric code that indicates the last note of the differentia and a sequentially-applied number (e.g., A1, A2, G1, G2, etc.).
Lacoste, Debra. Inventory of London (Canada), University of Western Ontario - Music Library, M2150. In: Cantus Manuscript Database for Latin Ecclesiastical Chant: Inventories of Chant Sources. Directed by Debra Lacoste (2011-), Terence Bailey (1997-2010), and Ruth Steiner (1987-1996). Web developer, Jan Kolácek (2011-).
Images for differentia indexing provided by Brian MacMillan, Music Library, Western University.