ILLUSTRATIONS 15 



FIG. PAGE 



90. Same as Fig. 83. Ligation of the carotid and vago-sympathetic 



nerve 90 



91. Same as Fig. 83. Opening the carotid artery 90 



92. Same as Fig. 83. Insertion of the arterial canmila 91 



93. Same as Fig. 83. Final step in operation 91 



94. Insertion of femoral injecting cannula 93 



95. Dissection to expose the femoral artery and vein and saphenons 



nerve 95 



96. Same as Fig. 95. Position and relations of the vein, artery and 



nerve 95 



97. Exposure of the skull for a trephine opening 103 



98. Six inch tinner's snips. For cutting thick skin and fascia, etc. . 104 



99. Same as Fig. 97. Exposing dura mater 104 



100. Trephine 105 



101. Upper surface of a dog's brain 106 



102. "Straight" glass cannula 107 



103. Hand bellows 107 



104. Bandage saw 108 



105 Method of opening the chest by a median incision 109 



106. Method of exposing the left pulmonary artery and vein (Color 



plate) 110 



107. Applying the cardiometer over the ventricles Ill 



108. Cardiometer ' 112 



109. Administration of nitrous oxide or oxygen to a frog 114 



110. Method for making, purifying and administering nitrous oxide to 



a frog 115 



111. Yoke for tanks of oxygen, nitrous oxide or carbon dioxide . . . 115 



112. A double yoke for holding gas tanks 116 



113. Yoke for holding gas tanks 116 



114. Guthrie's carbon dioxide generator 117 



115. Method for studying the action of nitrous oxide, ethyl chloride, 



etc .... 118 



116. Apparatus used for closed ether anesthesia 122 



117. Table arranged for performing an experiment 123 



118. Diagrammatic view of the pan as seen from above 124 



119. Tracing obtained by the closed method of anesthesia 125 



120. Tracing showing the initial action of nitrous oxide 126 



121. Tracing showing the action of nitrous oxide and ethyl chloride . 127 



122. Apparatus for intratracheal insufflation 129 



123. Apparatus for administering nitrous oxide to an animal .... 130 



124. Tracing showing action of carbon dioxide 131 



125. Injection of drug solutions into anterior lymph sac of frog . . 134 



126. Injection of solutions into anterior lymph sac with a syringe . 134 



127. Injecting pipette made of glass 135 



128. Arrangement of apparatus for recording esophageal contractions 137 



129. Tracing showing four esophageal contractions, blood-pressure and 



respiration 138 



130. Harvard membrane manometer 139 



131. Arrangement of apparatus which may be used as a membrane 



manometer 141 



