i8 



GOOD HEALTH 



Instantly the flame was bent far over into the room. 

 This showed that down there the air was hurrying from 

 the cold hall into my warm room. 



Next I held the lighted match against the open crack, 

 near to the top of the door. Thereupon the flame went 

 through the crack and tried to get out into the hall. 



From this I knew that up 

 there the warm air was going 

 out into the cold hall as fast 

 as it could squeeze through 

 the crack of the door. The 

 whole experiment shows how 

 the air hurries back and forth 

 through any crack it finds. 



Since the air moves so easily 

 in one direction and another, 

 it is never hard to get fresh 



air into a house from out of doors, and it is no harder 

 to send impure air out of doors from any room or any 

 house. All we have to do is to keep the matter in mind 

 and arrange for it. 



We must also remember that in any room impure air 

 mixes with pure air fast enough to spoil the whole of it 

 in a very short time. We cannot tell the condition of 

 the air by the looks of the room because we cannot see 

 the air itself, but a little experiment with ink and water 

 will help us out, 



DRAFT OUT OF THE ROOM 



