148 



EXPERIMENTAL PHARMACOLOGY 



a bell jar (Fig. 139) or in an ordinary earthenware or 

 glass jar covered with a glass plate. A tin bread box 

 serves very well, especially if it has a glass window. Cot- 

 ton may be placed in the neck of the bell jar and the 

 ether dropped in on this. If a box like Fig. 138 is used, the 

 animal's head is left out when the lid is closed and a towel 

 on which the ether is dropped is placed over the cat's 

 head. Cotton saturated with ether can be dropped in the 

 earthenware jar or bread box. 



Fig. 139. 



Fig. 140. 



Fig. 139. Bell-jar as used for anesthetizing cats. 



Fig. 140. Glass or earthenware jar covered by a glass plate. Used for anesthetizing 



cats, rabbits, etc. 



Quickly tie the animal down on the operating board and 

 arrange to take a blood-pressure tracing. Connect inject- 

 ing burettes to both femoral veins. Record the normal 

 rectal temperature. By a median incision open the chest. 

 In a cat this is best done with tinner's snips (Fig. 98). 

 (See Fig. 105, also read Experiment V, 6, page 108.) When 

 the sterum is divided throughout its length pull the chest 



