Extrait d'une Lettre du P. Boscovich Jésuite Correspondant de l'Academie écrite à M. de Mairan.
176045083Paris Imprimerie Royale 1760. 4to. Extract from "Mémoires de Mathematique et de Physique Présentés à l'Academie des Sciences par divers Savans" Tome III. Pp. 321-325. A faint dampstain to inner margins. <br/><br/><em>First apperance of Boskovic's paper in which he explains how light is refracted and reflected in droplets of water creating the coloured rainbow - he discusses the sphericity in connection with both refraction and reflexion of light and he comments on Newton's optics. </em> unknown
