Written on vellum and completed in 1466 by Donnchadh Ó Bolgaidi, with two or three unidentified collaborators. The manuscript contains a considerable amount of material on medical topics, including valuable copies of some legal tracts relating to medical practice. The Materia medica occupies pages 167. Nessa Ni Shéaghdha says, Cat, i 66, that parts of the manuscript may have been written at