178 THE HUMAN BODY. 



SECTION III. I, Name the three divisions of the ear. 



2, What is the use of the external ear? What is it made of? 



3, Describe the external auditory canal. 



4, What is the drum-head? What is the drum? Is there any 

 opening out of the drum ? 



5, Where is the internal ear? What is its importance? 



6, What is sound ? 



7, What is the position of the little bones in the ear? 



8, What is the use of the little bones? How does the vibration 

 reach the nerve of hearing? 



9, Does the ear hear? 



10, What frequently causes an ear-ache? From what spot does a 

 discharge from the ear commonly come? Is a broken drum-head 

 ever repaired ? 



11, Does the loss of the drum-head destroy hearing? 



12, What is ear-wax? Is it safe to put instruments in the ear? 



SECTION IV. 1. Describe the orbits. 



2, State the shape, size, and position of the eyeball. 



3, What is the sclerotic coat of the eye? What is the cornea? 



4, What divides the eye into two chambers? What fills the pos- 

 terior chamber? The anterior chamber? What is the retina? 



5, Describe the iris. The pupil. What is the action of the iris? 



6, What is the conjunctiva? What is the use of the eyelashes? 

 What are the Meibomian glands? and what is their use? Where is 

 the lachrymal gland? What is its use? 



7, What are tears? How are they carried off from the eye? 



8, What muscles move the eyeball? and how do they act? 



9, How does the eye resemble a photographer's camera? 



10, Where is a picture of the object looked at formed? 



11-17, Name some causes of trouble in the eye. ^ What is the 

 effect of too long sight? What is the remedy? What is the effect 

 of too short sight? Among what class is it most common? What 

 are causes of too short sight? Give rules for the care of the eyes. 

 What is color-blindness ? 



SECTION V. 1. What are the effects of alcohol and narcotics on 

 the skin and eyes? 



