PURE AIR 



Suggested Project. 



I. TO MAKE A SUBSTITUTE FOR THE SPIROMETER WHICH YOU 

 CAN USE IN TESTING YOUR LUNG CAPACITY. 



Thought Questions. 



1. Do you breathe normally immediately after holding the 

 breath as long as possible ? 



2. Can you " hold your breath " longer with lungs inflated or 

 deflated? Why? 



Why is pure air necessary ? This is an age when people 

 seem to recognize the necessity of pure air for healthy liv- 



ing. People build houses with sun 



parlors open to the air, and with 

 sleeping porches where the entire 

 family may sleep winter and sum- 

 mer. New laws require city houses 

 and tenements to be built with an 

 adequate air space so that sleeping 

 rooms may have a proper amount 

 of air going in through the windows 

 at night. We have outdoor school- 

 rooms and both teachers and doc- 

 tors preach the need of proper 

 ventilation. 



It seems almost incredible that 

 over sixty barrels of air pass in and 

 out of your lungs every day of 

 your life. If you will count the 

 number of breaths you take in a 

 minute while you sit quietly in the schoolroom (number of 

 tunes your chest rises and falls), and then if you will exer- 

 cise vigorously for two minutes (a stationary run with hands 

 raised above the head will be a good exercise) and again 



An out-of-door sleeping porch. 



