The heart, its cavities and valves, 1878. Fig. 1: Anterior surface of Heart and Pericardial covering; Fig. 2: Posterior surface of Heart, Auricles, and Ventricales; Fig. 3: Internal cavities of Ventricals, anterior view; Fig. 4: Anterior surface of Heart, interior of right auricle exposed; Fig 5: Interior of right Auricle, Ventrical, and Pulmonary Artery; Fig. 6: Exterior of left Ventricle and of Aorta; Fig. 7: Transverse section of Auricles, Aorta, and Pulmonary Artery, immediately above the origins of these vessels, showing the auriculo-ventricular and arterial valves in action; Fig. 8: Transverse section of Ventricles. From "Atlas of human anatomy with explanatory text, containing 38 colored plates," by C.E. Bock, 1878.