CLAUDIUS FRANCES MILLIET, an excellent mathematician, mechanic, and astronomer, descended from a noble family, and born at Chambery in 1611. His principal performances are an edition of Euclid's Elements of Geometry, in which the unseemly propositions are rejected, and the uses of those retained annexed; a discourse on fortification; and another on navigation. These with others have been collected, first in 3 vols folio, and afterwards in 4, under the title of Mundus Mathematicus: being indeed a complete course of mathematics. He died in 1673, professor of mathematics in the university of Turin.