NICERON (John Francis), was born at Paris in 1613. Having finished his academical studies, with a success which raised the greatest hopes of him, he entered into the order of the Minims, and took the habit in 1632; whereupon, as is usual, he changed the name given him at his baptism for that of Francis, the name of his paternal uncle, who was also a Minim, or Franciscan. The inclination and taste which he had for mathematics appeared early. He began to apply himself to that science in his philosophical studies, and devoted thereto all the time he could spare from his other employments, after he had completed his studies in theology. All the branches of the mathematics, however, did not equally engage his attention; he confined himself particularly to optics, and only learned of the rest as much as was necessary for rendering him perfect in this. There remain still, in several houses wherein he dwelt, especially at Paris, some excellent performances, which discover his skill in this way, and which make us regret that a longer life did not suffer him to carry it to that perfection which he desired; since one cannot help being surprised that he proceeded so far as he did, in the midst of those occupations and travels by which he was forced from it, during the short space of time which he lived. He hath himself observed, in the preface to his Thaumaturgus Opticus, that he went twice to Rome; and that, on his return home, he was appointed teacher of theology. He was afterwards chosen to accompany father Francis de la Noue, vicar-general of the order, in his visitation of the convents throughout all France. But the eagerness of his passion for study put him upon making the best of all the moments he had to spare for books; and that
wise economy furnished him with as much as satisfied him. Being taken sick at Aix in Provence, he died there Sept. 22. 1646, aged 33. He was an intimate acquaintance of Des Cartes. A list of his writings is inserted below (A).