770 GENERATION AND DEVELOPMENT. 



or by the roundabout way through the liver, all the 

 blood which is returned from the placenta by the umbili- 

 cal vein reaches the inferior vena cava at last, and is 



Fir,. 228. 



carried by it to the right -auricle of the heart, into which 

 cavity is also pouring the blood that has circulated in the 

 head and neck and arms, and has been brought to the 



