among anatomists. The radius of the arm has two kinds of motions, the one called pronation, the other supination. Pronation is that whereby the palm of the hand is turned downwards; and supination, the opposite motion thereto, is that whereby the back of the hand is turned downwards. The peculiar 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.