RESPRIATION. 

 Fig. 5. 



245 



, the cut edges of the ribs, forming the lateral boundaries of the 

 cavity of the thorax ; 6, the diaphragm, forming the inferior boundary 

 of the thorax, and the division between the thorax and the abdomen ; 

 c, the cut edges of the abdominal muscles, turned aside, exposing the 

 general cavity of the abdomen. 



Fig. 1, the cut edge of the pericardium turned aside ; 2, the heart ; 

 3, the great vessels in immediate connexion with the heart ; 4, the 

 trachea, or wind-pipe ; 5, the lungs ; 6, the liver ; 7, the stomach ; 

 8, the large intestine ; 9, the small intestines ; 10, the urinasy bladder. 



pale red, in youth of a darker colour, and in old age of a 

 livid blue. 



11. The air enters the lungs through the trachea or wind. 

 21* 



