Assembled in the early fourteenth century, this "library within a book" contains a wide array of literary, historical, grammatical, scientific, astronomical, theological, pastoral and devotional texts. The texts are predominantly in Anglo-Norman (the form of French used in Medieval England), but also Middle English and Latin, illustrating the persistence of a multi-lingual culture centuries after the Norman Conquest.
An illustration to a short treatise derived from the works of Thomas Aquinas and Avicenna, this shows the human brain comprising five cells or "ventriculi" that represent the five "powers" of thought: common/imaging sense, imagination, estimation, cogitation and memory.