DECHALES (Claudius Francis Millett), an excellent mathematician, mechanic, and astronomer, descended from a noble family, and born at Chamberly in 1611. His principal performances are an edition of Euclid's elements of geometry, in which the unservice-
able 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 1678, professor of mathematics in the university of Turin.