366 AGRICULTURE ON THE PACIFIC SLOPE 



ing goes on all over the body. * Every part of the body 

 burns what it needs to get energy to do its work and 

 gives off the carbon dioxide formed in burning (also 

 other poisonous and waste products) to the blood. 

 The blood then goes back to the lungs to be purified 

 by contact with the air. 



The burning does not take place in the blood itself, 

 but in the muscles, nerves, and other organs when they 

 are at work. 



Importance of deep breathing. Nothing helps so 

 much to make us well and strong as deep breathing. 

 To learn this is of the highest importance. The breath- 

 ing muscles should be trained as much or more than 

 any others. Fast walking, hill climbing, and running 

 train these muscles. As many times a day as you 

 can (whether you are indoors or outdoors), take a 

 deep breath and hold it while you count ten. While 

 holding the breath, bend back the head and stretch 

 the arms. In this way you will rapidly increase the 

 size of the chest and the chest expansion, and you will 

 increase your vitality and endurance. Short, quick 

 breathing brings fresh air to the upper part of the 

 lungs only. Tight clothing or lacing or anything 

 which interferes with deep breathing is very in- 

 jurious. 



Without deep breathing the lungs do not get ex- 

 panded by the air, and when we begin to run and take 

 more air into the lungs it at first gives us an uncom- 



