230 ELEMENTS OF MAMMALIAN ANATOMY. 



7. Describe the gland secreting the tears and how they reach the 

 nasal cavity. 



8. By cutting away the lateral and dorsal walls of the orbit dissect 

 the muscles of the eyeball and make a drawing of them, labelling all 

 parts. 



9. What nerves control the movements of the eyeball? 



10. Procure the eyes of any mammal from the butcher-shop or 

 slaughterhouse ; bisect one in the meridional and the other in the equa- 

 torial direction. Make a drawing of the features seen and label. 



11. Remove the crystalline lens from a fresh eye, describe its size, 

 shape, structure, length of focus, and power of magnification. 



12. Describe the path of a stimulus from the retina to the area of 

 sight in the brain. 



13. Name every feature visible in the eyes you have dissected. 



14. What nerve supplies the auditory organ? 



15. Describe the middle ear. 



16. In what part of the temporal bone is the internal ear located? 



17. By looking into the auditorius meatus of the dried skull two open- 

 ings are seen. Into which portions of the internal ear do these lead? 



18. Write a description of the internal ear. 



19. Mention some important points of difference in the nervous sys- 

 tem of various mammals. 



20. What relation, if any, between intellectual ability and brain de- 

 velopment? 



