1 64 ANSWERS TO PRACTICAL QUESTIONS 



13. What part needs the warmest ? 



The feet, because they are furthest from the center of 

 heat and motion and most exposed to cold and wet : and 

 the neck and shoulders, since here are located the deli- 

 cate organs of voice and respiration. 



14. Why is a " spare bed " generally unhealthy ? 

 Because it is apt to be damp and unventilated. 



15. Is there any good in sighing? 



(See Physiology, page 91.) 



It probably brings up the " arrears " of respiration. 



1 6. Ought a hat to be thoroughly ventilated ? How ? 



Certainly, as the heated, foul air is injurious. A single 

 hole at the top is quite insufficient for ventilation. 

 Several openings should be made on the sides near the 

 band. 



1 7. Why do the lungs of people who live in cities become 

 of a gray color. 



Probably because of the deposition of carbonaceous 

 particles which penetrate the substance of the tissues. 

 The coloring is permanent, like tattooing, where india- 

 ink is pricked beneath the skin. 



1 8. How would you convince a person that a bed-room 

 should be aired ? 



Take him from the fresh, pure, invigorating out-door 

 atmosphere into the close, depressing air of the bed-room, 

 when first vacated in the morning, and his sense of smell 

 will satisfy him of the need of ventilation. 



