STANDING, WALKING. 207 



What are joints, and by what means are they kept smooth? 



How is the skeleton divided T 



At what age are our bones completely hardened ? 



What organs enable us to move our bodies ? 



How are muscles composed 1 



By what means is motion produced in muscles ? 



Can you describe by what means your arm is bent and 

 stretched 1 



What are extensor muscles ? 



What are flexor muscles 1 



What are the ends of muscles called ? 



What difference is there in the action of voluntary and 

 involuntary muscles ? 



LESSON IV. 



STANDING WALKING RUNNING LEAPING 



SITTING. 



THE principal actions which our bodies can per- 

 form, are standing, walking, running, leaping, and 

 sitting. Besides these, the hand and fingers are 

 capable of a wonderful variety of minute and 

 delicate operations ; and the muscles of other parts 

 of our bodies, as the face, the throat, and the eyes 

 have each a great variety of motions. 



How do you stand ? Your body is erect, and 

 you keep yourself from inclining either to one side 

 or the other. If it were the will of God that you 

 should die in this posture, you would fall down at 

 once ; or if any other cause should deprive you of 



