A rare 16th century manuscript book on the subject of philosophy. Contemporary limp vellum binding (20.5cm x 15cm x 3xm), c. 220 leaves (unnumbered) of Latin script - entirely manuscript in black ink on quality paper by an accomplished hand, evidently complete, in single column of up to 27 lines in a single hand, dated 1588 to final leaf. Condition: FAIR to GOOD. Covers somewhat cockled and stained. Some marginal staining, particularly to initial leaves. Very occasional old marginalia.