A fox is called Vulpes, and hath that name as it were wallowing feet aside, and goeth never forthright, but always aslant and with fraud. And is a false beast and deceiving, for when him lacketh meat, he feigneth himself dead, and then fowls come to him, as it were to a carrion, and anon he catcheth one and devoureth it. The fox halteth always, for the right legs are shorter than the left legs. His skin is right hairy rough and hot, his tail is great and rough; and when an hound weeneth to take him by the tail, he taketh his mouth full of hair and stoppeth it. The fox doth fight with the brock for dens, and defileth the brock's den, and hath so the mastery over him with fraud and deceit, and not by strength.... The fox feigneth himself tame in time of need, but by night he waiteth his time and doeth shrewd deeds. And though he be right guileful in himself and malicious, yet he is good and profitable in use of medicine. THE SOURCES OF THE BOOK ADAMANTIUS (fl. 258). Origen it quoted under this name. His commentaries on the Old Testament are the works quoted from. AEGIDIUS CORBOLIENSIS, of Corbeil (d. 1220). A doctor at Montpellier, and Canon of Paris. ALANUS DE INSULIS, OR DE RYSSEL (d. 1202). A monk of Canterbury, most probably an Englishman. His principal work is a poem in 9 books, called ANTI-CLAUDIANUS, largely quoted by all Middle Age writers. An account of it is given in the notes on the Secreta Secretorum (E.E.T.S.). He also wrote DE PLANCTU NATURAE, PARABOLAE, etc. ALBERTUS MAGNUS (1193-1280). A famous doctor in the University of Paris and a Dominican Theologian. The works quoted are commentaries on the Natural Histories of Aristotle. They have often been printed. He was teacher of Thomas Aquinas and a contemporary of our author. ALBUMAZAR (d. 886). An Arab astronomer. ALCUIN (735-804). An English theologian: the work quoted is his "De Septem Artibus." ALEXANDER NECKHAM, OR NEQUAM (1157-1217). His principal work is "De Naturis Rerum," a book little known on the Continent. Its use by Bartholomew is thus another proof of his English birth. ALFARAGUS (9th cent.). An Arab astronomer, whose work is notable as being the chief source of the celebrated astronomical treatise, "The Sphere," of Johannes Sacrobosco (John of Halifax), a contemporary Englishman. It was the popular text-book for over three centuries, and was as well known as Euclid. ALFREDUS ANGLICUS (fl. 1200). A physician and translator of Aristotle. See JACOB'S AESOP for a discussion on his works. AL GHAZEL (1061-1137). A sceptic opponent of Averroes. AMBROSE (d. 397). The Hexameron is the work used. ANSELM (1033-1109). Theologian, Archbishop of Canterbury. The inventor of Scholasticism. ARCHELAUS. A Greek geographer. ARISTOTLE (384-322 B.C.). I would refer the reader to BRÈCHILLET JOURDAIN on the EARLY TRANSLATIONS OF ARISTOTLE, where he will find a mine of information on the works of this writer used in the Middle Age. AUGUSTINE (d. 430).