This book consists of editions and translations of the three known texts in which Adelard of Bath (c. 1080-1150) addresses his 'Nephew': an exhortation to the study of the liberal arts which constitute 'philosophy' (On the Same and the Different), a dialogue on the nature of things in which rational causes are sought (Natural Questions), and a discussion concerning the upbringing and medication of hawks (On birds). A preface introduces the works and places them in the context of the Court schools of Norman bishops and dukes.