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professor of natural philosophy and mathematics at Utrecht, was born at

, professor of natural philosophy and mathematics at Utrecht, was born at Gorcum in 1620. He went through a course of philosophy at Leyden; and then pursued his studies at Bois-le-duc, where he was very much esteemed by Samuel des Marets, who taught philosophy and divinity, in that place. He went from thence to Utrecht, where he learnt the mathematics, and then removed to Leyden, where he obtained leave to teach them. He was afterwards made professor at Utrecht; and because the professors had agreed among themselves that every one might teach at home such a part of philosophy as he should think fit, de Bruin, not contented with teaching what his public professorship required, made also dissections, and explained Grotius’s book “De jure belli et pacis.” He had uncommon skill in dissecting animals, and was a. great lover of experiments. He^made also observations in astronomy. He published dissertations “De vi altrice,” “De corporum gravitate et levitate,” “De cognitione Dei naturali,” “De iucis causa et origine,” &c. He had a dispute with Isaac Vossius, to whom he wrote a letter, printed at Amsterdam in 1663; wherein he cites Vossius’s book De natura et propnetate Iucis, and strenuously maintains the hypothesis of Descartes. He wrote also an apology for the Cartesian philosophy against a divine, named Vogelsang. In 1655, he married the daughter of a merchant of Utrecht, sister to the wife of Daniel Elzevir, the famous bookseller of Amsterdam, by whom he had two children who lived but a few days. He died in 1675, and his funeral oration was pronounced by Graevius.