BONAVENTURE, an eminent mathematician in the 17th century, a native of Milan, and a friar of the order of the Jesuits of St Jerome, was professor of the mathematics at Bologna, where he published several mathematical books, particularly the "Method of Indivisibles." He was a scholar of Galileo. His "Dilectiorum generale Uranometricum" contains great variety of most useful practices in trigonometry and astronomy. His trigonometrical tables in that work are excellent.