274 PURE AIR. 



you account for this ? Because the air in the close 

 room was exceedingly impure, and, to some de- 

 gree, poisonous. 



You have learnt, that when we respire, the air 

 undergoes a great change, is robbed of that portion 

 which is essential to life, and its place supplied ^y 

 another kind of air, which kills animals. 



When several candles or lamps are burning in 

 the room, the air is still more rapidly rendered 

 unwholesome ; because these bodies, in burning, 

 also deprive it of its oxygen. We can now easily 

 explain why, in crowded evening parties, we so 

 soon get fatigued and listless ; and why people who 

 are fond of them, and very frequently .go out, are 

 often ill, and look pale and poorly. 



It is very hurtful for several children to sleep 

 together in the same room, unless it is spacious and 

 freely ventilated ; and it is still worse for them to 

 sleep in the same bed. When this cannot be help- 

 ed, the windows should be often opened, and a 

 ventilator fixed into one of them, in order that, 

 during the night, the heated and foul air may 

 escape. 



Many contagious disorders are conveyed by 

 means of the air. This should make us very cau- 

 tious in going near places where sickness prevails; 

 because if we breathe an atmosphere loaded with 

 effluvia from diseased bodies, we run a great risk 

 of catching the disorder. 



Rooms in which sick persons are confined soon 

 become full of putrid exhalations, or bad smells, 



