I. Islam -- Recommencements de l'algèbre aux XIe et XIIe siècles -- The Influence of Stoic Logic on Al-Ja????'s Legal Theory -- The Beginnings of Islamic Theology -- Science, Philosophy, and Religion in Alfarabi's Enumeration of the Sciences -- II. The Twelfth and Thirteenth Centuries in the Latin West -- The Organization of Sciences and the Relations of Cultures in the Twelfth and Thirteenth Centuries -- La nouvelle idée de nature et de savoir scientifique au XIIe siècle -- Experience, Praxis, Work, and Planning in Bernard of Clairvaux: Observations on the Sermones in Cantica -- III. The Fourteenth, Fifteenth, and Sixteenth Centuries in the Latin West -- From Social into Intellectual Factors: An Aspect of the Unitary Character of Late Medieval Learning -- Autonomous and Handmaiden Science: St. Thomas Aquinas and William of Ockham on the Physics of the Eucharist -- Reformation and Revolution: Copernicus's Discovery in an Era of Change -- Réflexions sur les rapports entre théorie et pratique au moyen âge -- Philosophy and Science in Sixteenth-Century Universities: Some Preliminary Comments.