60 GENERAL SCIENCE 



able to work and play unless we keep a continual supply 

 of pure air flowing into our lungs. The lungs must 

 also be kept healthy and open so that the oxygen may 

 pass into the blood. To insure this the muscles of the 

 chest and the diaphragm must be developed and made 

 strong by breathing exercises. The lower part of the 



Increased Air 



Space 



Inspiration Expiration 



DIAGRAMMATIC SECTIONS OF THE BODY IN INSPIRATION AND 

 EXPIRATION 



chest should not be made smaller by tight clothing such 

 as ladies sometimes wear. In this way serious ill health is 

 often caused in later life. The evil results of tight bands 

 worn about the waist, especially by young girls, frequently 

 continue to make the life of the victim miserable to its end. 

 43. Mouth Breathing. We sometimes see children 

 and adults continuously breathing through the partially 

 open mouth. Notice yourselves to see if you are doing 

 this. The mouth was not made for the purpose of 

 taking air into the lungs, but the, nose was. People 



