THE STORY OF THE BRAIN AND NERVE 103 



example, the heart and 

 bloodvessels are con- 

 trolled by this system, 

 and the movements of 

 the intestine in diges- 

 tion, depend for their 

 control upon the sym- 

 pathetic nerves. The 

 division of labour prin- 

 ciple is, therefore, seen 

 to be illustrated in the 

 work of the two nervous 

 systems, seeing that a 

 vast number of impor- 

 tant actions upon the 

 due performance of 

 which existence itself 

 may be said to depend, 

 are regulated not by us, 

 but for us. The work of 

 the sympathetic centre 

 consists in supervising 

 what may be called the 

 ordinary actions of the 

 body connected with 

 digestion, circulation, 

 and the like, while the 

 brain system remains 

 free for the supervision 

 of the more important 

 questions and actions of 

 the day and the hour. 



WHAT THE NERVOUS 

 SYSTEM DOES. 

 If a broad but 



ig. 3u. VIEW OF SPINAL 

 CORD, SHOWING ITS CONNEC- 

 TION WITH THE BRAIN, AND 

 THE SPINAL NERVES ISSUING 

 FROM THE CORD. 



