_Valves_ semilunar, 16, 45, 116, 153 tricuspid, 16, 101, 153 mitral, 17 Galen on valve of pulmonary artery, 51 of the veins discovered by Fabricius or Silvius, 78 of veins, their structure, arrangement, and use of, 78, 80 Fabricius did not understand use of valves of veins, 79 of veins compared with sigmoid valves, 82 experiments on the arm to show action of the, and how the blood moves in the veins, 82, 84 not found in all veins, 116 of the mesenteric veins, 116 coronary vein has a valve at its orifice, 125 _Veins_ pulmonary, ancient views regarding their position, 17 near the heart, experiment of ligaturing the, 65 of the arm, experiment on with bandages, 82, 84 coronary, 88 of the mesentery, the function of the, 118 umbilical, function of, 118 coronary vein has a valve at its orifice, 125 experiment on, by cooling the arm, 168 valves of the. See _Valves_ _Vena cava_ of snake, experiment upon the, 65 experiment of tying, near the heart, 129 _Vena portæ_ blood passes from the, through the liver, 118 its branches, 128 Harvey suggests the experiment of ligaturing it, 171 _Ventricle_ no right ventricle if no lung, 15, 54 the left, the principal part of the heart, 98 the left, three times thicker than the right, 100 case of rupture of the, 155 _Ventricles_ structure of both, almost identical, 15 both contract simultaneously, 19 movements and use of the, 37 in the fœtal heart, 98 valves of the, 100 _Vesalius_ the “Father of Anatomy”, x Professor of Anatomy at Padua, xiv did not properly understand the heart’s motion, 26 refers to Galen’s experiment on an artery, 135 wrong in his interpretation of Galen’s experiment, 138 _Vlackveld, John_ letter of Harvey to, 200 W _Warmth_ felt in the hand on loosening bandage on the arm, 69 restored to parts chilled by the influx of blood, 121, 146 _Will_ of Harvey drawn up by Heneage Finch, 212, 214 proved by Eliab Harvey, 219 legacies by, to Drs. Scarborough and Ent, 216 _Wolff, Caspar_ Harvey as forerunner of, xxi