6 LABORATORY LESSONS IN GENERAL SCIENCE 



tention be given them? What should be done, and what 

 avoided, in order to preserve the teeth? 



Make a study of a tooth obtained from a dentist, or else- 

 where, and tell the place and nature of (a) dentine; (b) 

 enamel; (c) pulp. 



12. Where are the voice sounds produced? What is 

 the function of the mouth in speech? What are the bad 

 results of breathing through the mouth ? What are ade- 

 noids, and when may their removal become necessary? 



13. Aside from its use in speech, what is the chief use of 

 the mouth ? What uses has the saliva f By what is its flow 

 affected? Where is it secreted? 



THE EYE 1 



1. Describe the location of your eyes with regard (a) to 

 the body as a whole ; (b) to the face as a whole ; (c) to the 

 nose. 



2. Of the eyeball tell (a) its estimated diameter; (b) 

 the general form of it as seen with the eyes widely opened ; 

 (c) the names of the several visible parts ; (d) the form, color 

 and relative position of each part. In which part of the 

 eyeball can changes in size be noted ? 



3. Watch closely the movements of the eyeball, and tell 

 in what directions it can be made to move. 



4. Make observations of the eyes of several people and 

 state what differences you observe (a) in the depth to which 

 the eyes are set in the head ; (6) in the amount of ball exposed ; 



1 Use a small mirror for the study of your own eye. 



