LESSONS ON THE HUMAN BODY 



of the throat about where the tongue seems to be rooted, 

 ascertain if possible to what it is attached. Of what ad- 

 vantage is an attachment of this kind ? 



7. Describe the form, size, color, and coverings of 

 the tongue. Note how it may be rubbed against the 

 roof of the mouth, and state what is accomplished by 

 this action in eating. Mention other uses of the tongue 

 in eating. 



8. For a person who is in good health what is the ap- 

 pearance of the tongue as to (a) moist look; (b) coatings? 

 What information is really sought by the physician when he 

 "looks at the tongue"? What is tonsillitis (ton-si-li'tis) ? 



9. State the location of the 

 teeth in the mouth cavity, and 

 their general arrangement. Why 

 would it not be as well to have 

 muscle in place of bone for the 

 jaws? 



10. State the number, general 

 characteristics, and duration (a) of 

 the first set of teeth; (6) of the 

 permanent set. Classify the per- 

 manent teeth according to form. 

 State the number, form and special 

 use of each of these groups. 



11. Name the parts of a tooth. 

 Which part is exposed in the 

 mouth? What are the gums? 

 W T hy should we take good care of 

 the teeth ? How often should at- 



Hck 



Bone 



Cement or crusta petrosa 

 Alveolar periosteum or root-membrane 



FIG. 4. 



Cross- section of a 

 tooth. 



