166 THE WONDERFUL HOUSE THAT JACK HAS 



useful air with all the benefits it can bring. The 

 engine that propels an automobile is spoken of as one, 

 two, three, or more, horse-power, according to its pos- 

 sible strength and speed. Other things being equal, 

 our power to play, to do, and to enjoy, can be estimated 

 by the quantity of purifying air with which we supply 

 our bodies. Shall it be only one horse-power, when 

 by care and practice we can readily make it more? 

 Such low power in an automobile would not satisfy 

 us, if we could honestly obtain one of higher power. 

 What foolish body builders we should be to estimate 

 our own gain in power so lightly. 



Do we wish to equip our bodies with their greatest 

 possible air power ? The prescription is easy to remem- 

 ber. Fully appreciate the power to be gained. In- 

 telligently set about gaining it. Keep striving for it 

 unceasingly. Even ten deep breaths every night and 

 morning will cause remarkable progress. A deep- 

 breathing exercise at odd times during the day, when 

 walking, is good. The same exercise upon going into 

 the out-of-door air for a few moments' change after 

 long-continued work or study indoors, will always be 

 refreshing and beneficial. Above all we must not be 

 satisfied until rhythmic deep breathing is our regular 

 habit. 



Breathing out all the air we can, immediately after 

 leaving a close street car, a theater, or other crowded 

 room, and then refreshing the lungs with several long 

 deep breaths of pure air is also a good practice. 



