NERVOUS SYSTEM 395 



should be given to quiet and meditation. The various 

 sorts of mental healing often produce good only because 

 they establish nerve quiet, and direct the thoughts 

 away from self. One can live under good conditions 

 of physical hygiene, and yet become a nervous wreck, 

 if he is the subject of constant nervous irritation. 

 Great minds cultivate poise and equanimity. We are 

 wont to magnify the small ills of life, if there are no 

 large objects to occupy us. One engaged in thoughts 

 of science, government, or philosophy is not so worried 

 over his own petty affairs of life. The dignified pur- 

 suit of a worthy object in life gives tone and poise to 

 the nerve system."* 



Questions 



1. Why would it be impossible for us to live with- 

 out a nervous system? 



2. What is the structure of a nerve cell? Of a 

 nerve ? 



3. How does a motor nerve differ from a sensory 

 nerve ? 



4. Give the parts of the brain. 



5. Why is it so essential that the brain be 

 protected? 



6. Describe the cerebrum and state its functions. 



7. How does the cerebellum differ from the cere- 

 brum in appearance and in size? What is its 

 function ? 



8. How is the brain connected with the spinal 

 cord? 



*Blount, Physiology and Hi/fiicne. Row. Peterson & Co. 



