x ii EXPERIMENTAL PHYSIOLOGY 



eaaB 

 no. 



100. Effects or Tetanisino the Vagus with Diefkkext Strengths ok 



Stimuli 12i * 



101. The Effect of Tetanisation oe the Vagus 126 



102. Stimulation of the Sympathetic 127 



103. The Effect of Muscarine and Atropine on the Frog's Heart . 131 



104. The Effect of Applying a Weak Solution of Nicotine directly 



to the Heart 1^2 



105. Tracings Eecorded by a Lever Besting upon a Frog's Heart . . 134 

 10G. Roy's Tonometer (Halliburton) 135 



107. Sen a fee's Frog-heart Plethysmograph 136 



108. Frog-heart Plethysmograph by which the Pressure Changes can 

 also be Recorded by a Small Manometer 137 



109. A Simple Form of Apparatus for Artificial Respiration . . . 139 



110. Arrangement of Levers for Recording the Movements of the Mam- 



malian Heart by Attaching Threads to the Auricle and Ventricle 



■ respectively ............ 140 



111. Tracing Obtained from the Rabbit's Heart, Employing the Levers 



of Fig. 110 14 1 



112. Result of the Stimulation of the Left Vagus 142 



113. Result of the Injection of 1 c.c. of a 4 per cent. Solution of 



Caffeine Citrate 143 



114. The Cardiograph 144 



115. A Cardiogram taken upon a Man 145 



116. Kuhne's Experiment of Contraction without Metals . . . . 148 



117. Arrangement of Apparatus for Showing Secondary Contraction . 148 



118. Side View of Galvanometer and Shunt, Lamp and Scale (Waller) . 149 



119. Course of Current through Galvanometer (Waller) . . . 150 



120. Plan of Du Bois-Reymond's Method of Measuring the Muscle 



Currents ............. 152 



121. Lippmann's Capillary Electrometer (Waller) 154 



122. Currents of Frog's Heart (Waller) 155 



123. Arrangement of Apparatus to Show the Paradoxical Contraction . 156 



124. Schema of the Circulation 158 



125. Apparatus for Studying the Passage of a Pulse Wave along an 



Elastic Tube 163 



126. Marey's Sphygmograph (Halliburton) 164 



127. Diagram to Show the Arrangement of the Levers in Marey's 



Sphygmograph 164 



128. Sphygmogram Taken by Marey's Sphygmograph 165 



129. Richardson's Modification of Dudgeon's Sphygmograph . . . 166 



130. Plan of the Levers in Dudgeon's Sphygmograph .... 166 



131. Two Sphygmograms Taken by a Dudgeon's Sphygmograph . . . 167 



132. Arrangement of Apparatus for a Blood-pressure Experiment . . 169 



133. Dissection of the Nerves of a Babbit's Neck 170 



134. Two Forms of Cannula 170 



135. Tracing of the Blood Pressure from a Babbit taken by the Mercury 



Manometer 172 



136. Blood Pressure and Respiratory Tracing of a Curarised Cat under 



Morphia 173 



