LESSONS ON THE HUMAN BODY 7 



(c) in the general appearance, luster, expression, movement 

 and other characteristics. 



5. Mention any important purpose apparently served 

 by having the eyes placed (a) so high up in the body; (6) 

 at the surface rather than deeply set. 



6. What protection has the eyeball (a) at the sides; 

 (b) in front? 



7. Of the eyelids state (a) the significance of the name ; 

 (b) their structure; (c) the form of each when the eye is 

 closed and when open ; (d) their relative size ; (e) the amount 

 of motion for each ; (/) the place, of the eyelashes. 



8. Describe the nature, form and length of the eye- 

 lashes. What is their apparent purpose ? 



9. State (a) what would result if the secretion of the 

 tears were to cease; (b) how the tear-water is spread over 

 the eyeball ; (c) how much 



of the time the eyeball is 

 kept moist ; (d) from what 

 point under the lids the 

 tears flow; (e) the signifi- 

 cance of water running from 

 the nose when one cries; 

 (/) why the tears do not 

 overflow the cheeks all the FlG ' 5 " ~ The tears ' 



time; (g) the course of the tears across the ball. 



10. When a bit of dirt or any solid particle gets under the 

 eyelid, what may be done to remove it ? 



11. What uses have the eyebrows? In what respects 

 are they unlike in different people ? 



