For these studies Aristotle and his
commentators were the chief guides. The medical
authorities of the middle ages have been catalogued for us
by Chaucer in his description of a doctor of "phisyk"--
"Wel knew he the olde Esculapius
And Deiscoricles, and eek Rufus,
Old Ypocras, Haly and Galien;
Serapion, Razis and Avicen;
Averrois, Damascien and Constantyn;
Bernard, and Gatesden, and Gilbertyn."
Of these names eight are included in Duke Humfrey's gifts
to Oxford in 1439 and 1443; and ten of them are
represented in the catalogue of Peterhouse Library in 1418.
Besides the writers mentioned by Chaucer, works on fevers
by Isaac the Arab, the Antidotarium of Nicholas, and the
Isagoge of Johannicius were in general use.
Next to theology--in which class the chief books were
the same as in the claustral library, although liturgical books
are more rarely found--the largest section of an academic
collection was that of civil and canon law. It comprised
the various digests, the works of Cinus of Pistoia and Azo;
texts of decrees, decretals, Liber Sextus Decretalium, Liber
Clementinae, with many commentaries, the Constitutions of
Ottobon and Otho, the book compiled by Henry of Susa,
Cardinal Bishop of Ostia, called Summa Ostiensis, the
Rosarium of Archdeacon Guido de Baysio, and Durand's
Speculum Judiciale.
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