A Fragmentary Witness of William of Ockham’s Brevis Summa Libri Physicorum

The binding of an incunable edition printed in Leuven and formerly owned by the Franciscan convent in Cologne preserves one bifolium and the offset of another from a copy of William of Ockham’s Brevis summa libri Physicorum. This note describes the physical remains, and attempts to reconstruct the parent manuscript’s appearance and the place of its text in the textual tradition of the commentary.