or BRUYN, JOHN DE, professor of natural philosophy and mathematics at Utrecht, was born at Gorcum in 1620. His skill in the dissection of animals was remarkable, and he was a skilful experimenter. He also made observations in astronomy. He published dissertations De el altrice; De corporum gravitate et levitate; De cognitione Dei naturali; De lucis causa et origine, &c. In a dispute with Isaac Vossius, he wrote a letter, printed at Amsterdam in 1693, in which he criticises Vossius's book De Natura et Proprietate Lucis, and strenuously maintains the hypothesis of Descartes. He died in 1675, after he had been professor twenty-three years; and his funeral oration was pronounced by M. Gravis.