Monantheuil, Henry De

, an able mathematical and medical writer, was born at Rheims about 1536, of a family which possessed jthe estate of Monantheuil in the Vermandois, in Picardy. He was educated at Paris in the college de Presles, under Kamus, to whose philosophical opinions he constantly adhered. Having an equal inclination and made equal progress in mathematics and medicine, he was first chosen professor of medicine, and dean of that faculty, and afterwards royal professor of mathematics. While holding the latter office he had the celebrated De Thou and Peter Lamoignon among the number of his scholars. During the troubles of the League, he remained faithful to his king, and even endangered his personal safety by holding meetings in his house, under pretence of scientific conversations, but really to concert measures for restoring Paris to Henry IV. He died in 1606, in the seventieth year of his age. His works are, 1 “Oratio pro mathematicis artibus,” Paris, 1574, 4to. 2. “Admonitio ad Jacobum Peletarium de angulo contactus,” ibid. 1581, 4to. 3. “Oratio pro suo in Regiam cathedram ritu,” ibid. 1585, 8vo. 4. “Panegyricus dictus Henrico IV. statim a felicissima et auspicatissima urbis restitutione,” &c. ibid. 1594, translated into French in 1596. 5. “Oratio qua ostenditur quale esse debeat collegium professorum regiorum,” &c. ibid. 15&6, 8vo. 6.“Commentarius in librum Aristotelis Tt^I Tuv /x>i%avjv,” Gr. and Lat. ibid. 1599, 4to. 7. “Ludus latromathematicus,” &c. ibid. 1597, 8vo, and 1700. 8. “De puncto primo Geometriae principio liber, 7 ’ Leyden, 1600, 4to. This was at one time improperly attributed to his son, Thierry. 9.” Problematis omnium quse & 1200 annis inventa sunt nobilissimi demonstratio," Paris, | 1600. He left some other works, both ms. and printed, of less consequence. ¹