1 82 ANSWERS TO PRACTICAL QUESTIONS 



175. i. Why is the pain of incipient hip-disease fre- 

 quently felt in the knee ? 



The sensation of pain is located by the mind, at the 

 part of the body where the injured nerve takes it rise. 



2. Why does a child require more sleep than an aged 

 person ? 



The processes of nutrition are going on rapidly, and, 

 in youth, much rest is required to repair the losses of 

 each day ; in age, waste predominates, and the repairs 

 made are of a temporary character. The building is soon 

 to be torn down, and little effort is taken to beautify or 

 strengthen that which is to be used for so short a time. 



3. When you put your finger in the palm of a sleeping 

 child, why will he grasp it ? 



The unconscious action of the near nervous centers 

 produces a contraction of the muscles. 



4. How may we strengthen the brain ? 



By judicious, habitual, but not exhaustive employment. 

 The life of the brain is in change. Monotony is stagna- 

 tion, and stagnation is decay. 



5. What is the object of pain ? 



Pain is monitory in its character. It guards against 

 danger and warns us of the presence of dfrease, z. e., the 

 want of ease. Were it not for this, we should lose the 

 use of the more delicate 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 



