This booklet is in essence a catalog and presents a portion of the results of the effort of the Medical Audio-Visual Institute to discover and evaluate medical motion pictures. A review of 31 films dealing with a wide range of subjects in the cardiovascular field is presented. Subject matter includes embryology, physiology, congenital anomalies, effects of electrolytes, angiocardiography, electrocardiography, and therapy both medical and surgical. The review of each film states the intended audience and the author's name and availability of the film, and gives a summary of content and appraisal of content, presentation, and effectiveness and the reviewer's estimate of its usefulness. In addition, 113 films, not reviewed, are listed. Some of these are available, others not. A list of 35 distributors of cardiovascular films is included. Teachers and research workers in the cardiovascular field will find this catalog valuable in planning audiovisual teaching programs.