CONSTITUTION 



35 



in this connection is that the resistance met by the blood in its 

 circulation throughout the body is nearly, if not quite, as impor- 

 tant as the actual pumping power of the heart itself. Any 

 animal when fat, is at a disadvantage in that many, or all, of 

 the finer blood vessels are surrounded by a more or less compact 

 mass which not only reduces the size of the blood-vessels some- 



FlG. 11. 



Fig. 12. 



Fig. 11. — Showing coarse shoulders, an undesirable point. 

 FlQ. 12. — Showing sharp, angular shoulders, desirable in dairy type. 



what, but also renders them less elastic, less responsive to the 

 pulsations of the heart. This throws a greater burden upon the 

 heart itself. Given two animals with heart power equal, one 

 animal in moderate flesh or lean, blood-vessels surrounded by 

 loose connective tissue, the other with blood-vessels surrounded 

 by fat, the leaner animal would be able to work or run longest 

 and would be said to possess the strongest constitution. In 



