CONCLUSION. 391 



025. Hearing requires the active attention of the brain and 

 the mind ; and deafness or imperfect hearing may be caused by 

 the mere habit of neglecting impressions received by the ears. 



926. The faculty of hearing may be cultivated to a very 

 high degree. The practised hunters and the American 

 Indians, who are trained to attend to and catch very slight 

 and distant sounds, can hear the natural voice of animals and 

 men, or their footsteps, or even their breathing, or other, 

 noises indicating their existence, when others hear nothing. 



927. The ear for music or power of distinguishing har- 

 monies of sound, is partly a natural gift, and partly a matter 

 of cultivation. Almost all fe&ve it in some degree, and some 

 in a very high degree. And there are very few in whom it 

 may not be increased by education. 



CONCLUSION. 



Man responsible for Care of his Health. Strength and Weakness, 

 and Length of Life, given according to Man's Faithfulness. In- 

 tention of Nature that we live happy and long. Power lost by 

 Sickness. Life shortened. Errors in the Management of Health. 

 Constitution impaired in various Ways. Effect of Education 

 and Circumstances on Constitution. 



928. THE human body, with its complicated structure 

 and organs, is left in the charge of man. He is appointed to 

 take it as it comes from the hands of the Creator, and de- 

 velop and exercise it, direct its actions, supply its wants, and 

 govern all the appetites, according to the requirements of life. 

 These conditions are exact and unyielding, and the good 

 or evil consequences are certain to follow their fulfilment or 

 neglect. In ratio of our obedience will be the fulness of life, 

 its strength, its comfort, and its duration. We can have no 

 health except so far as we obey the law. We can relax in 



