THE WONDERFUL HOUSE THAT JACK HAS 5 



Of course all know this Wonderful House that 

 Jack Has is made up of the head, trunk, and limbs. 

 The head contains the brain, which controls and 

 directs the rest of the body, and is most strongly for- 

 tified by the skull. The trunk has two compartments. 

 In the upper, the chest, are the lungs and heart, well 

 protected by the strong ribs. In the lower, the ab- 

 domen, are the stomach, intestines, liver, kidneys, 

 and other important organs. 



We sometimes wonder at the easy way the ball- 

 bearing wheels of modern machines move, but we shall 

 see that bicycles and automobiles do not begin to be 

 put together with such skill as are our bodies. It is 

 not very important to know that these houses of ours 

 contain about two hundred bones, or that our bones 

 are covered with six hundred or more muscles. But 

 it is very important to understand that our habits 

 of standing and sitting, what we eat, drink, wear, and 

 do, all affect the health and development of these 

 bones and muscles. 



