86 APPLIED PHYSIOLOGY 



early, as can be easily and painlessly done, the jaw will 

 grow into proper shape, and allow the child to breathe 

 through its nose and become well again. 



Many children breathe through the mouth from habit. 

 They should keep from it even when they feel short of 

 breath. 



Another reason why a child should not breathe through 

 the mouth is that it may produce earache. 



156. Deep breathing. The larger your lungs are, the 

 more air you can take in. So you ought to take a deep 

 breath several times a day. Then hold your breath as long 

 as possible. In this way you will increase the size of your 

 lungs and become able to run a long distance. It will also 

 make you stronger all over, and be a great protection 

 against your taking diseases. 



A man should be able to make his chest two inches 

 larger around with each breath. Three or four inches 

 will be better. The more you can expand your lungs, the 

 longer-winded you will be. 



157. Position of the body. You should always keep 

 your shoulders thrown back and your chest forward, so as 

 to give the lungs all the room you can. A round-shouldered, 

 flat-chested man has little room for his lungs. 



158. Tight clothing. When your clothes are tight 

 around the body, you cannot expand your lungs so much 

 as you wish, and so you cannot run or work without getting 

 out of breath. If you wear tight clothes day after day, 

 your lungs will finally grow small and you will never be 

 strong. 



The waist should be large around so as to give room for 

 the liver as well as the lungs. Girls need as much room 

 for their livers and lungs as boys. They do a great deal 

 of harm to themselves by making their waists small. 



