CLOSED METHOD OF ANESTHESIA 



123 



nula carries a short piece of rubber tubing and a screw 

 clamp. Close the clamp and insert the side tube of the can- 

 nula into the hole in the cork, which closes the large spout 

 from the pan. Bun enough oxygen into the pan to lift the 

 bath cap up about one inch above the top of the large pan. 

 From the burette it will probably be necessary to inject 

 about one or two cubic centimeters of ether into the pan be- 

 fore the anesthesia becomes deep enough. Do not be in 

 too much of a hurry to add this ether, for the anesthesia 

 should not be any deeper than is necessary. Hereafter the 



Wash jar Ether bottle 



injecting burette 



Stethograph 



Ligatures 



Artificial 

 respiration 



Key Electrodes 



Pressure 

 bottle 



Inductorium 



Cord for jaws 



outh rod Dog board 



fan for 

 waste 

 materials 



Cotton sponges 



Sig. maqnet 

 Tbmbour 



Cord forfrac^e^ Lias, 



Kymo- 

 graph 

 drum 



'Hemostats' 



Hq -manometer 



f- -N/VWVWVfcWV, 



5 WWVWWV*/ 



^To timer- 



Liqatures din. Tinner's snips Trephine 



Fi^. 117. Arrangement of the apparatus on the table for performing an experiment. 



anesthetist merely watches to keep a fair amount of oxygen 

 in the pan and at long intervals from one-half to one cubic 

 centimeter of ether may be injected if needed. The anes- 

 thesia should remain perfectly constant and regular if no 

 leaks are present in the apparatus. These are not difficult 

 to avoid. If the experiment is performed correctly the stu- 

 dent will be impressed with the ease and certainty with 

 which a perfect anesthesia can be maintained for long per- 

 iods of time. If too much ether (or other anesthetic) gets 

 into the pan open the screw clamp on the tracheal cannula 



