Functions of the Occlusal Surfaces of the Teeth**Read before the Section on Partial Denture Prosthesis at the Sixty-Seventh Annual Session of the American Dental Association, Louisville, Ky., Sept. 24, 1925.The late Dr. Frank Wadsworth first interested me, in 1922, in this work by showing me that artificial and natural molars chopped food into pieces by multiple incision. Since then, Dr. B. B. McCollum has urged me to describe more accurately what Dr. Wadsworth taught. Dr. Spencer Atkinson, by methods of comparative anatomy, showed in a clinic, in July, 1925, at the annual convention of the Southern California Dental Association, that chewing is in various animals done by multiple shearing.