NICERON, 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. The following are his principal works: 1. L'Interpretation des chiffres, ou regles pour bien entendre et expliquer facilement toutes sortes des chiffres simples, &c. 2. La perspective curieuse, ou magie artificielle des effets merveilleux de l'optique, catoptrique, et dioptrique. This is only an essay to the following work: 3. Thaumaturgus opticus, sive, Admiranda optices, catoptrices, et dioptrices, pars prima, &c. Two other parts were intended to complete the latter work, but were unfinished at his death.