of Plato derived through St. Augustine. But this material already in the possession of the West was the foundation of scholasticism, and was developed as far as it would go. Boethius transmitted a Latin version of Porphyry's Isagoge and of the Categories and Hermeneutics of Aristotle, whilst John Scotus translated the Pseudo-Dionysius. The further development of Latin scholasticism came in three stages: first, the introduction of the rest of the text of Aristotle, as well as the scientific works of the whole logical canon, by translation from the Arabic; then came translations from the Greek following the capture of Constantinople in 1204; and thirdly, the introduction of the Arabic commentators.
The first Latin scholastic writer who shows a knowledge of the complete logical Organon was John of Salisbury (d. 1182 A.D.), who was a lecturer at Paris, but it does not appear that the metaphysical and psychological works of Aristotle were in circulation as yet.
By this time Paris had become the centre of scholastic philosophy, which was now beginning to predominate theology. This takes its form, as yet untouched by Arabic methods, in the work of Peter Lombard (d. 1160 A.D.), whose "Sentences," an encyclopædia of the controversies of the time but a mere compilation, remained a popular book down to the 17th century. The methods and form used in the "Sentences" shows the influence of Abelard, and still more of the Decretals of Gratian. It is interest-
