_Heart_ ideas about the, before the time of Harvey, ix object of its beat connected with Respiration by old anatomists, 9 movements of the, 24 contracts and becomes paler at its beat, 24, 25 does not suck in the blood, 27 the auricles and ventricles of the, their movements, 31 the auricles of the, the primum vivens, ultimum moriens, 34 observations on the heart of the chick, 34, 36 always has auricles or something analogous, 35 of a shrimp, its movements studied, 36 movements of, summarised, 37 intimate connection of lungs and, a grand cause of error to the old observers, 39 of fish, has only one ventricle, 42 great vessels of the, in the embryo, 44 foramen ovale of the, in the fœtus, 44, 98, 165 of embryo, pulsation, etc., known to Aristotle, 45 compared figuratively to the sun, 57 amount of blood ejected at each beat of the, 59 of a live snake, observations on, 65 influenced by emotions, 87 curious case of distended heart under emotion, 156 coronary vessels of, 88 only organ containing blood for general use, 88 structure of the, in different classes of animals confirms the circulation, 97 papillary muscles and chordæ tendineæ of, 99 arrangement and use of the valves of the, 100 the heart a muscle and acts as such, so called by Hippocrates, 104 development of the, in the fœtus, 104 arrangement of the fibres of, 105 the first part which exists, 105 high importance of the, in the bodily economy, 105 distension of, after hanging, 154 Sir Robert Darcy’s case of ruptured, 155 receives heat from the blood, 167 innate heat of, suggested as cause of the pulse, 168 of the fish, observations of motions of the, 169 _Hippocrates_ entitled the heart a muscle, 104 his doctrine as to the constitution of the body, 142 _Hobbes_ on the reception of Harvey’s discovery, xvii _Hofmann, Caspar_ letter of Harvey to, 175 _Horst, J. D._ letters of Harvey to, 195, 197 _Huxley, Prof. T. H._ on Harvey’s treatise on Generation, xxi J _Jugular vein_ Experiment of dividing the, in the fallow deer, to show course of the contained blood, 153 K _King, The._ See _Charles I._ L _Lacteals_ discovered by Aselli, 117, 186 Harvey refers to the researches of Aselli and Pecquet on the, 186 Harvey discusses the, in a letter to R. Morison, 187, 188 _Lamentius, Andreas_ quoted by Harvey, 20, 22 _Lennox, Duke of_ Harvey accompanied him abroad, xxii _Letters_ of Harvey, 173 _et seq._ _Ligature_ of veins near the heart, 65 assuming circulation, action and use of ligatures readily understood, 67, 68 of vena cava, 129, 172 of pulmonary veins, 165 of vena portæ, 171