CONGENITAL MALFORMATIONS. 301 



the entire mass of blood. The blood becomes more venous ; it 

 is colder and darker than it ought to be. Add to this the accu- 

 mulation of the blood in the systemic veins, the inevitable con- 

 sequence of every disturbance in its passage through the heart, 

 but which is especially marked in cases like this. The veins of 

 the extreme parts, of the lips, eyelids, nose, ears, hands and feet, 

 arc permanently distended with blood, so that the blue, livid 

 coloration of those parts, cyanosis^ becomes one of the pathogno- 

 monic signs of the condition in question. 



