PUNCTURE OP THE BOWEL. 



577 



drawn, the gas discharges with a hissing noise through the cannula, 

 which is held in position until the distension subsides or gas no longer 



[Fig. 410. — Showing the relative positions of the thoracic and abdominal organs. 

 Left side. (After Leisering.) 



Fig. 411. — Showing the relative positions of the thoracic and abdominal organs. 

 Right side. (After Leisering.) 



escapes. Sometimes very little gas escapes, or its discharge may 

 suddenly be arrested ; this may be due to the puncture having been 



R.S. P p 



