INNOCENT III. (d. 1216). Wrote "De Contemptu Mundi," etc. ISAAC (circ. 660). An Arab physician, who translated many Greek authors into Arabic. ISIDORE (d. 636). Bishop of Seville. He wrote a work on Etymology in 20 books, one of the most popular works of the Middle Age. JACOBUS DE VITRIACO (d. 1240). A Crusading Bishop, afterwards Cardinal legate. Wrote an EXEMPLAR, and 3 books of Eastern and Western History. JEROME (340-420). JOSEPH BEN GORION (900). Abridgment of Jewish History containing many legends. JOSEPHUS (37-95). Jewish historian. JORATH. DE ANIMALIBUS. A Syriac writer (?). LAPIDARIUM. See MARBODIUS DE GEMMIS. There are many treatises under this name. LEO IX. (1054). See Migne, Patrologia. LUCAN (d. 65). One of the most popular Latin poets of the Middle Age. MACER FLORIDUS (6th cent.). On THE VIRTUES OF HERBS. MACROBIUS (circ. 409). His commentary on the dream of Scipio was a favourite work in Medieval times. MARTIANUS CAPELLA (circ. 400). Wrote a poem, THE MARRIAGE OF MERCURY AND PHILOLOGIA, treating of THE SEVEN LIBERAL ARTS, which was the standard text-book from the 5th century for the schools. MESSAHALA (circ. 1100). METHODIUS, PSEUDO- (8th cent.). DE AGARINI. MICHAEL SCOT (circ. 1235). At this time concerned in the translation of some Arabic works on Astronomy, and Aristotle's DE COELO and DE MUNDO DE ANIMA, and HISTORIA NATURALIS with commentaries. MISALATH ASTROLOGUS (?). PAPIAS (circ. 1053). Grammarian. [Milan, 1467, etc.] PERSPECTIVA SCIENCIA. I cannot say whether this is Bacon's, Peckham's, or Albertus Magnus', but I believe it to be Peckham's, who was an Englishman, and afterwards Archbishop of Canterbury. PETRUS COMESTOR (d. 1198). Named MAGISTER HISTORIARUM or Master of Histories, wrote an account of the world from the Creation, which, when translated into French, was called the "Mer des Histoires." A favourite Medieval book. PHILARETUS (1100). A writer on Medicine. PHYSIOLOGUS. A Syriac compilation of moralities on animal myths. It first appears in Western Europe as THEOBALDUS DE NATURIS XII. ANIMALIUM. Of Alexandrian origin, it dates from before the fourth century, and appears to have been altered at the will of each writer. PLATEARIUS SALERNITANUS (circ. 1100) was Johannes, one of a family of physicians at Salerno. His work is called the PRACTICA. A book on the virtues of herbs. [Lugd., 1525, etc.] PLATO (430-348 B.C.). The TIMAEUS is quoted, probably from Chalcidius. PLINY (d. 79). Natural History. This and Isidore's work are the two chief sources of medieval knowledge of Nature. PRISCIAN (circ. 525). Grammarian and physicist. PTOLEMY (circ. 130). An Alexandrian astronomer, known through Arabic translations only at that time. [Ven., 1509, etc.] RABANUS MAURUS (776-856) of Fulda, pupil of Alcuin. A Benedictine, afterwards Archbishop of Mayence, who wrote DE UNIVERSO MUNDO. [1468; Col., 1627, etc.] RASIS (d. 935). An Arab physician, perhaps the greatest of the School. [Ven., 1548, etc.]