_Calidum innatum_, 145 not distinct from the blood, 146 _Canalis arteriosus_ of fœtus, shrinks gradually after birth, 45 _Capillaries_ too minute for Harvey to see, xvi first observed by Malpighi, xvi _Carotid artery_ experiment on the, 129 force with which blood flows from the, 136 _Charles I._ his interest in Harvey’s discovery, xviii Harvey appointed physician to, xxii remained such by request of the Parliament, xviii dedication to, of treatise on Motion of Heart and Blood, 3 present at a demonstration by Harvey, 153 _Chick_ first sign of the heart in the, 34 Aristotle on, 34 observations of, on the fourth and fifth days of incubation, 36 _Chordæ tendineæ_, 99, 100 _Chyle_ absorbed by the blood, 92 vessels containing, 186 _Circulation of the Blood_ circulation as distinct from motion, xii first suggested to Harvey’s mind, 56 compared to circular movement of rain as suggested by Aristotle, 56 confirmed by three propositions, 58 varies in rapidity, 61 explains the results of ligatures, 67 _et seq._ explains phlebotomy, 73 summary account of, 85, 168 confirmed by probable reasons, 86 proved by certain consequences, 90 confirmed from structure of the heart in many different kinds of animals, 96 doctrine of the, the opposite to that vulgarly entertained, 108 first reply to Riolan on the, 111 applies to the whole of the blood, 114 in the mesentery, 119 coronary, or a third and very short, 125 through every part of the body, 126 second reply to Riolan on the, 133 reply to those who cry _cui bono?_, 149 reasons given by opponents for not accepting the, 149, 150 velocity of, varies with age, sex, temperament, etc., 156 influenced by the emotions, 158 recapitulation of work on Motion of Heart and Blood, 161 interference with, followed by dangerous results, 171 further illustrations of, 176 _et seq._ _Columbus, Realdus_ claimed as discoverer of the Circulation, xi referred to in relation to the Pulmonary Circulation, 12, 16, 50 _Columnæ carneæ_ of the heart, 99 _Contagion_ of disease spread, explained by circulation, 90 nature of, referred to by Harvey, 193 _Contraction_ the source of all animal motion, 102 of the fibres of the heart, 105 of muscles as aid to movement of blood in the veins, 116 _Conviction_ means of acquiring, of physical truths discussed, 158 _Coronary_ vessels supply the heart with blood, 88 circulation, a third, very short, 125 vein usually has a valve at its orifice, 125 D _Darcy, Sir Robert_ case of, illustrating obstruction of the circulation through the heart, 155