Thomas Aquinas began his series of Aristotelian commentaries with a commentary on On the Soul, which he followed with commentaries on On Sense and What Is Sensed and On Memory and Recollection, written in 1268-70. Until now, these latter two commentaries have never been published in English translation. The translations presented in this volume are based on the critical Leonine edition of the commentaries, which includes the Latin translations of the Aristotelian texts on which Aquinas commented. The volume includes English translations of these Latin translations, allowing the reader to compare Aristotelian text and Thomistic commentary in detail. The translations of both commentaries are furnished with introductions and notes by the translators.