THE SKELETON. 17 



SUGGESTIONS TO THE TEACHER. 



Be sure that the acid and burning experiments on the com- 

 position of bones are performed either by yourself or by the 

 pupils. Get a piece of flat bone sawed to show the layers. 

 Get a leg joint at the butcher's; remove muscles and tendons, to 

 show the ligaments; then sever the bones at the joint to show 

 cartilage. Show a fresh piece of long bone containing marrow. 



TEST QUESTIONS. 



Of what is the skeleton composed? 

 To what parts of a house are the bones compared? 

 How many bones in the skeleton? 

 Do the teeth belong to the skeleton proper? 

 How many single bones in the body? 

 How many are in pairs? 

 What variety of shapes have the bones? 

 What two kinds of material in the bones? 

 Which material makes the bone flexible? 

 What is the effect of the mineral matter? 

 How do these materials vary at different ages? 

 What wise provision in this arrangement? 

 Why are the ends of the long bones more spongy? 

 Why are they covered with cartilage? 

 In what ways are the bones united? 

 Locate a hinge-joint of the body. 

 Where is a ball and socket joint found? 

 What bones are united by sutures? 

 What bones are united by cartilages? 

 Ho\v are the bones bound to each other? 

 Name four uses of the bones. 

 Into how many groups are the bones divided? 

 What is the skull? 



Point out on the Aid, the frontal bone, the parietal tem- 

 poral occipital. 



How many bones form the face? 

 What two form the bridge of the nose? 

 Where are the malar bones? 



