THE VASOMOTOR NERVES. 549 



is diminished, while that through the rest of the body is increased 

 to a greater or less extent corresponding to the size of the area in- 

 volved in the constriction. When the blood-vessels of a given 

 organ are dilated the blood-flow through that organ is increased and 

 that through the rest of the body diminished more or less. The 

 adaptability of the vascular system is wonderfully complete, and 

 is worked out through 'the reflex activity of the nervous system 

 exerted partly upon the vasomotor fibers and partly upon the regu- 

 latory nerves of the heart. 



