IN HYGIENIC PHYSIOLOGY. 187 



cate organs. A child might gaze at the sun until its eyesight 

 was ruined. The author knew of a man who had lost the 

 sense of feeling in one leg because of the sensory nerve being 

 severed. He was constantly bruising and burning that limb 

 until he ruined it entirely. 



6*. IVJiy will a bloiv 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 one hundred 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 no- 

 bleness of soul, the simple habit of cherishing high and gener- 

 ous purposes, refine and spiritualize the countenance, making, 

 at last, the homeliest features to glow with a beauty that will 

 be a true "joy forever." 



9. Wliy do intestinal worms sometimes affect a child's 

 sight ? 



Through the action of the sympathetic system of nerves. 



10. Is there any indication of character in physi- 

 ognomy ? 



(See Question 8 ; also Physiology, p. 205.) 



11. When one's finger is burned, where is the ache ? 



All pain is in the brain. It is located, however, by the 

 mind, at the place of the injury. 



* A barefooted 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 of the accident. 



