CHESELDEN, WILLIAM English surgeon, was born at Somerby, Leicestershire, on Oct. 19, 1688. He studied anatomy in London under William Cowper (1666-1709), and in 1713 published his Anatomy of the Human Body. He became surgeon at St. Thomas's and St. George's hospitals, London. Cheselden is famous for his "lateral operation for the stone," which he first performed in 1727. He also effected a great ad vance in ophthalmic surgery by his operation of iridectomy, de scribed in 1728, for the treatment of certain forms of blindness by the production of an "artificial pupil." He attended Sir Isaac Newton in his last illness, and was a friend of Alexander Pope and of Sir Hans Sloane. He died at Bath on April Io, 1752.