LIST OF ILLUSTRATIONS. xv 



FIG. TAGE 



76. Curves taken during the escape of the heart from vagal inhibition 



(v. Frey) . . . . . .111 



77. Effect of. respiration on arterial pressure (Fredericq) . . .123 



78. Respiratory undulations, of aorta and .vena cava pressures (Hill and 



Barnard) . ..... . . . . . . 124 



79. Diagram to illustrate the effect of intrathoracic pressure upon the blood 



fiow through the thorax . . . . . . 125; 



80. Model illustrating the effect of intrathoracic pressure on the circulation 



(Funke and Latschenberger) .... . . . .126 



81. Aortic pressure. Effect of artificial respiration (Kowalewsky) . . 127: 



82. Plethysmograms of hind-limb. Excitation of sciatic nerve (Bowditch 



and Warren) . . ... . . . . . 134 



83. , . . - 135 



84. Traube-Hering curves produced by injection of magnesium sulphate; .of: I 

 .dog . . . . .: , . . . . 139 



85. Plethysmographic tracing of arm and record of Cheyne-Stokes respira- . ," i 



tion ; man . . . . . . . . . . . . . 139 



86. Effect of injection of absinthe on blood pressure (Bayliss and Hill) . 140 



87. Respiration and cerebral pulse tracings (Mosso) .... 142: 



88. Cerebral pressure-gauge * . . . . . . ' 1421 



89. Effect of asphyxia on blood pressure (Bayliss and Hill) . . . 147 



90. Venous congestion in brain (Bayliss and Hill) . . . 148. 



91. Pulmonary and carotid arterial pressures (Bradford and Dean) . . 151 



92. Effect of exciting vasomotor centre on pulmonary and aortic pressures 



(Bradford and Dean) . . . ... . 152 



93. Pulmonary and carotid arterial pressiire ; effect of dividing spinal cord 



(Bradford and Dean) . . . . . . . 15& 



94. Pressure curves of pulmonary artery, left auricle, and femoral artery : 



effect of -excitation of sensory nerves (Francois- Franck) . . 153 



95. Limb plethysmograph . . . . . . 156- 



96. Record of aortic pressure and the volume of the fore- and hind-limbs 



(Bradford and Bayliss) . . - . . . . .156 



97. Effect of excitation of a superficial branch of the crural nerve on blood - 



pressure- and volume of organs (Hallion and Frangois-Franck) . . 157 



98. Aortic pressure and renal volume (Bradford) . . . . - 159- 



99. Schafer's visceral plethysmograph . . - ' 1^ 



100. Aortic pressure and splenic volume (Schafer and Moore) . 16$ 



101. Tracing of frog's heart ; effect of heating sinus and auricle . . 172 



102. Tracing from heart of toad j effect of heating ventricle . . . 17S 



103. Heart of tortoise . . . . . - . 173 



104. ,, suspended . . . . . .174 



105. . - to show appearance of preparation when a 

 block is -caused by slitting up the auricle 



106. 107. Beat of ventricle of frog, registered by Gaskell's modification of 



Roy's tonometer ..-.-. . * ^^6^ 

 108. Tracing from' heart of toad ; effect of stimulating intracranial vagus . 204 



109 . . 205 



Uy> ' 35 ' )J ' 



110-113. Tracing from heart of toad and frog ; effects of stimulating vago- 



aympathetic . . . . . 20 ^ 



114, 115. Tracings from heart of tortoise; effect of stimulating nerves . . 207 



116. Modification of Roy's tonometer . 



117. Preparation of heart of "tortoise to demonstrate the action of the vagus 



nerve on the quiescent auricles . . 



118.- Curve of demarcation current, caused by heating apex -of auricle I 

 I 



