PURE AIR AND THINGS THAT SPOIL IT 9 



This is not all. Men have tried experiments with gas 

 jets, and they find that when one of them is burning it 

 uses up more oxygen than three people ; that is, it will 

 use up the air three times as fast as you or I do. 



The next time you are in a lecture hall or a church in 

 the evening, count the gas jets that are lighted. If there 

 are one hundred of them, be sure to tell yourself that 

 they are using up the oxygen as fast as if there were 

 three hundred more people present. 



This is bad enough, but it is worse yet to have a gas 

 jet open when the gas is not lighted, for nothing spoils 

 the air faster. People who do not know the danger 

 sometimes make the terrible mistake of blowing the gas 

 out instead of turning it off when they go to bed. 



In December, 1903, in San Francisco, during one 

 night, six people in six different houses died because 

 the gas escaped into their rooms. They died because 

 they breathed this gas instead of oxygen. 



If you ever notice the odor of gas in a room, be sure 

 to find out where it comes from and turn the gas off. In 

 some cities the gas has no odor, and this makes it more 

 dangerous. 



Besides the odor of gas, other bad smells almost 

 always show that something is spoiling the air. 



Sometimes these unpleasant smells come from garbage 

 cans and wagons. Sometimes they stream out of an un- 

 clean cellar or a basement, or from soiled rags tucked away 



