ETHER, CHLOROFORM, ETHYL BROMIDE 



103 



EXPERIMENT V. 



Ether, Chloroform, Ethyl Bromide. (Dog: Motor Areas, 

 Blood-Pressure, Blood, Heart.) 



1. Arrange a dog as in Experiment IV, for recording 

 blood-pressure. Put adrenaline solution in the injecting 

 burette (in the femoral vein). Be sure the anesthesia is 

 regular and sufficiently deep. 



2. Loosen the dog's mouth and the right fore leg. Turn 

 the head and part of the chest over toward the left so as 

 to leave the top of the head turned well over to the right. 

 If the instructor advises it turn the dog's head entirely 



Fig. 97. Removal of a triangular area of skin and fascia over the skull for a trephine 



opening. 



over so that the top of the skull is directed upward. In 

 this case watch that the respiration is not hampered or 

 that the carotid or tracheal cannulas do not become dis- 

 turbed by compression of the carotid artery or trachea. 

 Observe Fig. 97 carefully. Make a median longitudinal 

 incision in the skin and fascia down to the skull as shown 

 in the illustration. With large scissors (Fig. 98) cut out 

 a triangular piece of skin and fascia. At the place marked 



