"St. Thomas Aquinas gives his views on the hierarchy of the sciences and their methods in several of his works, but his most extensive and penetrating treatment of these subjects is to be found in the two Questions translated in this little book. They are taken from his unfinished Commentary on Boethius' De Trinitate. Question Five deals with the division of the speculative sciences, Question Six with their methods. The Questions were written early in St. Thomas' career, very likely between 1255 and 1259, so that they are not always his last word on the subject; what he says in them should be studied with his statements in his later works. Yet, because he never again took up the problems in such detail, they are of exceptional value in giving us an appreciation of his views on these topics. "--