IN HUMAN PHYSIOLOGY. 183 



because of the sensory nerve being severed. He was 

 constantly bruising and burning that limb until he ruined 

 it entirely. 



6. Why will a blow on the stomach sometimes stop the 

 heart? 



By sympathy. The pneumogastric or tenth pair of 

 nerves supply the stomach and the heart. 



7. How long will it take for the brain of a man six feet 

 high to receive news of an injury to his foot, and to reply ? 



The nervous force has been estimated to travel at the 

 rate of 100 feet per second, although authorities vary 

 much. Taking this figure, it would require about one- 

 eighth of a second.* 



8. How can we grow beautiful ? 



If one is penurious, selfish, or hard-hearted, his face 

 will betray the fact to every passer by. Purity of thought 

 and nobleness of soul, the simple habit of cherishing high 

 and generous purposes, refine and spiritualize the coun- 

 tenance, making, at last, the homeliest features to glow 

 with a beauty that will be a true "joy forever." 



9. Why do intestinal worms ever affect a child's sight ? 

 Through the action of the sympathetic system of nerves. 



10. Is there any indication of character in physiognomy 1 



(See Question 8 ; also Physiology, page 171.) 



* A bare-footed boy steps on a thorn. If he had to wait for news of the 

 injury to be sent to his brain, and an order to be telegraphed back to remove 

 the foot, much time would be lost. As it is, with the first prick, the nearer 

 nerve-centers act and order the foot off almost before the brain has heard o* 

 the accident. 



