MUSCHENBROECK (Peter de), a very distinguished natural philosopher and mathematician, was born at Utrecht a little before 1700. He was first professor of these in his own university, and afterwards invited to the chair at Leyden, where he died full of reputation and honours in 1761. He was a member of several academies; particularly the Academy of Sciences at Paris. He was the author of several works in Latin, all of which show the greatest penetration and exactness in this way. He was also very consummate in the knowledge of law.