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119 philosopher was Bernard Silvestris, the interpreter of Virgil. His De mundi unitate is a Pantheistic exposition of the Universe; it is also a poem; and incidentally it affords another illustration of the general fact, that before the works of Aristotle were made known and expounded in the thirteenth century, all kinds of natural and quasi-philosophic knowledge were drawn from a variety of writings, some of them poor enough from any point of view, but none of them distinctly scientific and unliterary, like the works of Aristotle. Formal logic or dialectic, as cultivated by Abaelard for example, appears as an exception. It had been specialized and more scientifically treated than any branch of substantial knowledge; for indeed it was based on the logical treatises of Aristotle, most of which were in use before Abaelard's death, and all of which were known to Thierry of Chartres and John of Salisbury.

The contrast between the cathedral school of Chartres and the University of Paris illustrates the change from the twelfth to the thirteenth century. The former has been spoken of in a previous chapter, where its story was brought down to the times of its great teachers, Bernard and Thierry, of whom we shall have to speak in connection with the teaching of grammar and the reading of classical authors. The school flourished exceedingly until the middle of the twelfth century. By that time the schools of Paris had received an enormous impetus from the popularity of Abaelard, and scholars had begun to push thither from all quarters. But it was not till the latter part of the century that the University, with its organization of Masters and Faculties, began visibly to emerge out of the antecedent cathedral school. Chartres was a home of letters; and there Latin literature was read enthusiastically. But in