XVI CONTENTS 



CHAPTER LIV 



PAGK 



MOTORIAL AND VlSCERAL SENSATIONS . . . . 775 



CHAPTER LV 



TASTE AND SMELL ...... 779 



Taste .......... 779 



Smell ..... . . . . - . 783 



CHAPTER LVI 



HEARING ....... ... 788 



Anatomy of the Ear ........ 758 



Physiology of Hearing ..... 794 



CHAPTER LVII 



VOICE AND SPEECH ... 799 



Anatomy of the Larynx ..... 799 



Movements of the Vocal Cords .... 804 



The Voice ....... .' ! 806 



Speech . . . . . . . m .807 



Defects of Speech . . . . . . 808 



CHAPTER LVIII 



THE EYE AND VISION ...... 810 



The Eyeball ......... 811 



The Eye as an Optical Instrument .... 820 



Accommodation ....... 824 



Defects in the Optical Apparatus ...... 828 



The Skiascope ...... 831 



Functions of the Iris ...... 832 



Functions of the Retina ...... 834 



The Ophthalmoscope ....... 836 



The Perimeter ........ 839 



Visual Sensations and Colour Vision ... . 841 



Changes in the Retina during Activity . . . . .847 



Movements of the Eyeballs ...... 849 



Nervous Paths in the Optic Nerves .... .853 



Visual Judgments ..... 854 



