RESPIRA TION. 1 33 



abdominal walls. If the lever be used the incision 

 should be just large enough to admit the lever, and 

 should be located in the angle between the xyphoid and 

 the costal cartilages on the right side. 



Clamp with the serre-fines any small vessels which may 

 be oozing. After having clamped the rubber tube, which 

 connects the bulb to the tambour, carefully insert the 

 warm, wet bulb between the diaphragm and the liver. 

 The liver will usually afford sufficient resistance to cause 

 alternate compression and relaxation of the bulb and a 

 consequent rise and fall of the recording lever; if such 

 be not the case, the liver may be held in place by two 



FIG. 21. 



FIG. 21. Glass lever for transmitting movements of the diaphragm (d) 



to the receiving tambour. The abdominal wall forms the 



fulcrum (/) of the lever. 



fingers inserted through the incision. In the meantime 

 let another member of the division dissect out the left 

 phrenic nerve. Fig. 22 shows the relation of the phrenic 

 at the base of the neck, in the rabbit. 

 4.. Observations. 



a. Tactile observation of the diaphragm. 



(1) In what condition is the diaphragm during inspi- 

 ration ? Expiration ? 



