At the end of the ms, an added musical fragment, textless but signed.
[Informal discussion on Dominique Gatté's Musicologie Médiévale site - see image link below - includes the suggestion, from Peter Urguhart, that it MAY be the tenor of Pourquoy alles vous seullette, a chanson used as a model for an anonymous mass in Vienna 11883.]
IIIF Manifest