STRUCTURE OF THE LUNGS. 



169 



the other side, marked St w , but both it and the liver 

 are removed a little from their natural situation. G 

 is the gall-bladder. Ill are the various parts of the 

 intestinal canal through which the foqd is passed on 

 its way from the stomach, by what is called the pe- 

 ristaltic or vermicular motion of the bowel, one circle 

 of fibres narrowing after another, so as to propel its 

 contents slowly but steadily, and resembling in some 

 degree the contraction of a common wornu 



