ILLUSTRATIONS XXV11 



FIG. PAGE 



67. Tracing to show that vagus stimulation may facilitate transmission from 



auricles to ventricles 220 



68. Diagram to show the innervation of the heart in the frog or turtle. (Color 



Plate.) 224 



69. Frog heart tracing showing the action of nicotine 226 



70. Schematic representation of the innervation of the heart of the mammal. 



(Color Plate.) 226 



71. Tracings showing the effects on the heartbeat of the frog resulting from 



stimulation of the sympathetic nerves prior to their union with the 

 vagus nerve . 228 



72. Boy 's kidney oncometer 230 



73. Fall of blood pressure from excitation of the depressor nerve 239 



74. The effect of strong stimulation (heat) of the skin of the foot on the ar- 



terial blood pressure and respiratory movements 241 



75. Diagram showing the probable arrangements of the vasomotor reflexes . 242 



76. Aortic blood pressure, showing the effect of posture 245 



77. Tracing to show the effect of gravity on the arterial blood pressure . . 245 



78. The effect of gravity on the aortic pressure after division of the spinal 



cord in the upper dorsal region 246 



79. Schema to show the relations of the Pacchionian bodies to the sinuses . . 248 



80. Tracing showing simultaneous records of the arterial blood "pressure, the 



venous pressure, the intracranial pressure, the pressure in the venous 

 sinuses 251 



81. Electrocardiographic apparatus as made by the Cambridge Scientific Ma- 



terials Co 260 



82. Normal electrocardiogram 261 



83. Electrocardiogram (dog) taken simultaneously with curves from auricle and 



ventricle 262 



84. Records of electrocardiogram and movement of ventricle of frog showing 



that when the apex is warmed a typical T-wave appears in place of a 

 wave in the opposite direction appearing when the apex is cooled . . 264 



85. Sinus bradycardia 267 



86. Auricular extrasystole 267 



87. Ventricular extrasystoles arising in the right ventricle . . 267 



88. Ventricular extrasystole arising in the left ventricle . 267 



89. Paroxysmal tachycardia .268 



90. Auricular fibrillation 268 



91,. Auricular flutter . . . 270 



92. Delayed conduction 270 



93. Partial dissociation 271 



94. Complete dissociation 271 



95. Polysphygmograph 274 



96. Normal jugular tracing 274 



97. Reduced tracings from carotid, aorta, ventricle, auricle and jugular, to show 



the general relationships of the various waves 275 



98. Polysphygmograms including jugular, apex and radial tracings .... 275 



99. Delayed conduction time 277 



100. Dropped beats 277 



101. Premature beats (extrasystoles) ventricular in origin 278 



