John, born at Salingen, in the duchy of Berg, in 1622, professed philosophy and theology, first at Herborn, and afterwards at Duisburg, where he died on the 31st January 1665. He was one of the first who taught in Germany the doctrine of Descartes, which he had studied under John Ray at Leyden. His philosophical works (Opera Omnia Philosophica), collected at Amsterdam by John Theodore Schalbruch, in two volumes 4to, with a life of the author prefixed, by John Christian Hennius, show how well he was qualified to appreciate the merits of the French philosopher, and to follow in his footsteps. The most esteemed of Claubergh's works is his Logicae Vetus et Nova; but he has not admitted in this collection a little work, entitled Ars Etymologicae Testamentum e Philosophia fontibus derivata, published by him at Duisburg in 1668, in 8vo, and which Morhof has highly commended in his Polyhistor, and Leibnitz included in his Collectanea Etymologica. This brochure was intended as the prelude to a large work, De Clausis Linguae Germanicae, which, however, the projector did not find leisure or encouragement to execute. In a separate form we have collected J. Clauberghii et Martini Hundii Dissertationes selectae, quibus controversiae fidei adversus omnis generis adversarios explicantur, et J. Clauberghii et Tobias Andreae Exercitationes et Epistolae variis argumentis.