SYSTEMATIC ANALYSIS OF APPAEATUS. 95 



FIG. 87. 



Fig. 87, plan of h, Heart, with closed valves, leading into a, Arteries; 

 c, Capillaries, leading into v, Veins, leading through open valves into h, 

 ready to contract, closing one and opening the other set of valves. 



343. THE ARTERIES is the name of a set of tubes 

 that commence from the Heart as a single trunk, and, 

 dividing and subdividing, become continuous with the 

 capillary network, and pour their contents into it. 

 FIG. 



Fig. 88, view of a section of a minute portion of the intestinal canal. 

 14, Artery, its divisions connected with Capillaries 18 and 11, also connect- 

 ed with 15, a vein ; thus Blood is poured through 14, 18, 15. 



Describe Fig. 87. 343. What are ? Describe fig. 44, pa?e 27. Describe 

 Fig. 88. Can the course of the blood be traced from 14 round to 15 ? 



