PLAN OF CIRCULATION. 



85 



When the blood re-collects in the veins it is entering nar- 

 rower channels, and its rate is quickened ; but as the veins are 

 wider than the arteries, the stream does not enter the heart 

 with the velocity with which it left that organ. The veins 

 hold more blood than the arteries, and in dissecting the cat 



Pulmonary Vein 



Left Auricle 



Left Ventricle 



Aorta - 



Digestive Tube 



Pulmonary Artery 

 Lymph Vein 



Right Auricle 



Right Ventricle 

 .. Caval Vein 



Liver 



Fig. 30. Plan of Circulation. (Dorsal View?) 



or rabbit it will be noticed that the arteries are emptied of 

 blood ; that the tissues of most of the organs are fairly free 

 from blood ; but that the great veins, such as the caval veins, 

 are full. 



