Arnoldus: works on Aristotle Arnoldus: 'Aristotle, Comment in eius De Physica auscultatione, De anima, Metaphysica, De Coelo' (Commentary on Aristotle's Concerning the Physics of Hearing, Concerning the Soul, Metaphysics, Concerning the Heavens); Arnoldus: 'Dictata et Tractatus in Sphaeram' (Teachings and tracts on the Sphere), early 17th century. early 17th century