XV111 CONTENTS 



CHAPTER LIII 



PAGE 



TASTE AND SMELL ......... 729 



Taste .......... 729 



Smell 734 



CHAPTER LIV 



HEARING .......... 738 



Anatomy of the Ear ........ 738 



Physiology of Hearing ....... 745 



CHAPTER LV 



VOICE AND SPEECH ........ 751 



Anatomy of the Larynx . . . . . . .751 



Movements of the Vocal Cords . . . . . .757 



The Voice ......... 758 



Speech ......... 760 



Defects of Speech ........ 761 



CHAPTER LVI 



THE EYE AND VISION ........ 764 



The Eyeball ......... 765 



The Eye as an Optical Instrument . . . . . .776 



Accommodation ........ 780 



Defects in the Eye ........ 784 



Functions of the Iris . . . . . . . . 788 



Functions of the Retina ....... 789 



The Ophthalmoscope ....... 792 



The Perimeter ........ 795 



Colour Sensations . . . . . . . .796 



Changes in the Retina during Activity . . . . .801 



Various Positions of the Eyeballs ...... 805 



Nervous Paths in the Optic Nerves ...... 808 



VisualJudgments ........ 809 



CHAPTER LVII 

 TROPHIC NERVES . . ....... 813 



CHAPTER LVIII 



THE REPRODUCTIVE ORGANS . . . . . . .816 



Male Organs 816 



Female Organs . . . . . . . .821 



