CONSEQUENCES OF DEFICIENT VENTILATION. l8l 



sufficient in the morning, will not be enough at night 

 when the gas is lighted. 



7. How Deficient Ventilation may be Recognized. The 

 nose generally affords the most sensitive as well as the 

 most convenient test of the sufficiency of the ventilation 

 of an inhabited room. If ill ventilated, the air will 

 usually smell " close." Those who have been in the 

 room for some time are not likely to realize how foul the 

 air has become, as the nose gradually gets used to air 

 around it, which would be extremely unpleasant to one 

 just entering the room. If the room smells even the 

 least bit " close" to a person entering it from out of 

 doors, it needs more ventilation. 



8. Consequences of Living in Insufficiently Ventilated 

 Rooms. A stay of an hour or two in a room not supplied 

 with enough fresh air, results in headache, dulness, and 

 sleepiness, which soon go off when we get out again 

 into the fresh air. Children have often been punished 

 for seeming neglect of their studies, when the foul air of 

 the school-room was really to blame. 



If one spends a considerable portion of every day in a 

 badly ventilated room, the whole body is enfeebled. The 

 blood becomes poor in red corpuscles, and the face pale; 

 appetite is lessened, digestion imperfect, and the muscles 

 weak. The body, not getting enough oxygen and being 

 at the same time slowly poisoned by breathing its own 

 wastes over and over, has but little reserve force. It is 



7. How does the air of an ill-ventilated room affect the nose ? 

 Why may foul air not be perceived by those who have been some 

 time in an insufficiently ventilated room ? When does a room need 

 more ventilation ? 



8. What are the consequences of staying for an hour or two in a 

 badly ventilated room? What of spending several hours daily in 



