or Burgersdyk, Francis, a celebrated Dutch logician, was born at Lier near Delft, in 1590. He studied at the University of Leyden, and after completing his academical career with great distinction there, travelled through Germany and France. On arriving at Saumur in the latter country he began to study theology, and was so successful, that while still a very young man he was appointed professor of philosophy in that town. This office he held for five years, at the end of which period he returned to Leyden, where he accepted the chair of logic and moral philosophy, and afterwards that of natural philosophy. His system of logic was at one time universally received, and even yet has not fallen wholly into disuse. His treatise entitled Idea Philosophiae Moralis issued from the Elzevir press in 1644. Burgersdyk died at Leyden in 1629, in the thirty-ninth year of his age.