Third printing, with corrections. Series: Annals of Roentgenology, vol. XVIII. Tall 8vo. xi, 380 pp. Illus., index. Two-toned green cloth stamped in black, gilt spine; fore-edges foxed. Very good. The author based his work on the analysis of over 30,000 fluoroscopic and roentgenographic examinations, including a large number of normal hearts. [E. Ray Borun]