CHAPTER XXVII 



LUNGS, DUST, AND TOBACCO SMOKE 



The next time you play tag or any other exciting 

 game that makes you run, notice your breathing. 



You will see that the harder you jump or run the 

 harder your lungs will have to work. You will have to 

 breathe fast ; you will fill your lungs with air over and 

 over again ; and even then perhaps you will say, " Oh, 

 I 'm all out of breath ! " But that sort of exercise is the 

 very best thing for your lungs. It makes them grow. 



The next best thing is to stand out of doors every 

 morning and take ten deep breaths of fresh air, and 

 every night before going to bed do the same thing. 

 While you are doing this there are several things to 

 think about. In the first place stand straight like a 

 soldier, holding your chest forward. A sponge that is 

 crowded tight will not hold much water,* and air cells 

 that are doubled together will not hold much air. The 

 first duty then is to hold the body in such a way that 

 every air cell will be open and free. 



Now breathe slowly until the lungs are really full, but 

 do not strain them ; then breathe the air out as slowly 



as you breathed it in. 



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