126 



HUMAN PHYSIOLOGY 



necessary preliminary. The work of the senses is 

 too complicated for treatment in the present instance. 

 It is a topic, however, of vast interest, and will well 

 repay investigation by the aid of manuals specially 

 devoted to the exposition of the subject. 



Fig. 36. SECTION THROUGH THE EXTERNAL MEATUS, 

 MIDDLE EAR, AND EUSTACHIAN TUBE. 



(a) External auditory passage ; (&) attic of tympanum ; 



(c) Eustachian tube ; (d) internal auditory meatus ; 



(e) cochlea ; (/) ossicles ; (g) membrana tympani, 



or " drum " ; (h) styloid process. 



THE END. 



