xiv LIST OF ILLUSTRATIONS. 



FIG. PAGE 



33. Curves illustrating the effect of a rise of aortic pressure upon the 



pressure in the right and left auricles (Kauders) . . .51 



34. Effect of abdominal compression upon curve of aortic pressure . . 51 



35. ,, 5, 51 



36. Cardiographic tracing, illustrating effect on the volume of the heart of 



alteration in position (Barnard) . . . . .52 



37. Posterior view of medulla oblongata of the cat (Laborde) . . 54 



38. Reflex inhibition produced by inhalation of ammonia (Fran^ois-Franck) 58 



39. Dissection of the depressor nerve, rabbit (Ludwig and Cyon) . . 59 



40. Aortic pressure. Excitation of depressor (Bayliss) . . .60 



41. Aortic pressure and volume curve of limb (Bayliss) . . .61 



42. Flow of fluid in cylindrical tubes ; piezometer . . . .63 



43. Mode of determining velocity of flow (Nicolls) . . . .66 



44. Flow of fluid in branching tubes ...... 67 



45. Weber's model, illustrating the principles of the circulation . . 68 



46. Distribution of pressure and velocity during diastole and systole of the 



heart (Fredericq) ........ 69 



47. Apparatus for testing elasticity of arteries (Marey) . . .73 



48. Horizontal lines illustrating extension of artery under different 



pressures (Roy) ........ 73 



49. Effect of injection of saline solution on arterial, portal, and vena cava 



pressures (Bayliss and Starling) ...... 76 



50. Poiseuille's hsemodynamometer ...... 78 



51. Hiirthle's recording apparatus ..... 79 



52. Hill and Barnard's sphygmometer . . . . .79 



53. Ludwig's stromuhr, as modified by Tigerstedt . . . .83 



54. Chauveau and Lortet's dromograph ..... 84 



55. Dromograph tracing from carotid artery (Chauveau and Marey) . 85 



56. Tachograin ; arm elevated (v. Kries) . . . . .87 



57. Sphygmogram ; (v. Kries) ..... 87 



58. Tachogram ; arm dependent (v. Kries) ..... 87 



59. Sphygmogram ; (v. Kries) . . . .87 



60. Illustrating effect of change of posture on the circulation . . 90 



61. Aortic pressure ; effect of posture ...... 92 



62. and intracranial pressure ; effect of posture . . .92 



63. pressure ; effect of compression of abdomen, etc. (Hill and 

 Barnard) ......... 93 



64. Aortic and vena cava pressures ; effect of posture, etc. (Hill and Barnard) 94 



65. Scheme of the circulation (Hill and Barnard) . . . .95 



66. wave passage along elastic tube . . . .96 



D/. j) )) jj ,,..... 



68. Section of the forearm passing through the radial sulcus (Hill, Barnard, 



and Sequeira) . . . . . . . .104 



69. Superficial view of the radial vessels (Hill, Barnard, and Sequeira) . 104 



70. Pulse tracings, showing effect of venous congestion (Hill, Barnard, and 



Sequeira) . . . . . . 105 



71. Pulse tracings, showing effect of venous congestion (Hill, Barnard, and 



Sequeira) ......... 106 



72. Tracing, showing effect of occluding the brachial artery and the pulse 



(Hill, Barnard, and Sequeira) ...... 107 



73. Velocity of pulse wave. Carotid and radial pulse (Edgren) . . 108 



74. Experiment to show central origin of dicrotic wave (Grashey) . .109 



75. Tracings illustrating the effect of inhalation of amyl nitrite upon the 



pulse ......... 110 



