IN HUMAN PHYSIOLOGY. 1 65 



19. What persons are most liable to scrofula, consump- 

 tion, etc. 



(See Physiology, pages 94-98.) 



The victims of lung-starvation. 



20. If a person is plunged under water, will any enter 

 his lungs ? 



No. The epiglottis will close involuntarily and pre- 

 vent the admission of water. 



21. Are bed-curtains healthy 1 



No. They prevent the free circulation of the air and 

 confine the waste products thrown off from the body. 



22. Why do some persons take "short breaths" after a 

 mean 



The distention of the stomach prevents the free action 

 of the lungs. If such persons are not given to gluttony, 

 the lungs are small or the other organs misplaced. 



23. What is the special value of public parks ? 



They bring fresh air, sunshine, green grass and trees 

 within the reach of all. They are truly the " breathing- 

 holes of a city." They are thus of incalculable benefit 

 both on account of their sanitary and moral influence. 



24. Can a per son become used to bad air, so that it will 

 not injure him ? 



The system may come to endure without complaint, but 

 never fails to inflict full punishment for the infraction of 

 nature's laws. 



