A fragmentary partbook, containing a collection of 49 mass ordinary sections and mass propers. (Numbering 1-50, but no.15 is omitted.) Probably from a set of 5 books: identifiable pieces are mostly in 5vv, and in one piece the Sexta Vox is exceptionally copied in this book.
Nos. 3, 6, 21, 33, 43 are completely missing; only numbers 11, 13, 16, 19, 22, 25, 28, 35-42, 44-50 are complete. The remainder are incomplete or fragmentary.
Copied by a single scribe.