among anatomists. The radius of the arm has two kinds of motion, the one called pro- nation, the other supination. Pronation is that where- by the palm of the hand is turned downwards; and su- pination, the opposite motion thereto, is that whereby the back of the hand is turned downwards. The pec- uliar muscles whereby pronation is performed, are called pronators, as those by which supination is performed are termed supinators. See Anatomy, Table of the Muscles, and Plates.