CONTENTS. X i 



PAGK 



780. The Visual Field and Field of Sight of one Eye and of both Eyes 135 



787. Corresponding or Identical Points 137 



788. The Movements of the Eye-Ball ; the Primary Position and Sec- 

 ondary Positions ; the Kind of Movements which are possible' . 139 



789. Listing's Law ; the Experimental Proof 141 



790. The Muscles of the Eye-Ball 143 



791. The Action of the Ocular Muscles 145" 



792. The Nervous Mechanism of the Movements of the Eye-Balls ; the 



Co-ordination of the Movements 148 



793. The Nervous Centres for the Movements of the Eye-Balls . . . 151 



794. The Horopter 153 



SECTION XII. 

 ON SOME FEATURES OP VISUAL PERCEPTIONS AND ON VISUAL JUDGMENTS. 



795. On the Differences between the Objective Field of Sight and the 



Subjective Field of Vision 155 



796. The Psychical Processes belonging to Visual Perceptions; Illusions 



and Visual Judgments 157 



797. Appreciation of Apparent Size 158 



798. Judgment of Distance and of Actual Size 160 



799. The Judgment of Solidity 162 



800. The Struggle of the Two Fields of Vision 163 



SECTION XIII. 

 THE NUTRITION OF THE EYE. 



801. The Arrangement of the Blood Vessels 165 



802. The Vaso-Motor Changes in the Eye 166 



The Lymphatics of the Ej/e. 



803. The Lymphatic Vessels and Lymph Spaces of the Eye .... 166 

 s 804. The Aqueous Humour ; the Changes taking place in it ; how effected 168 

 805. The Vitreous Humour ; the Changes taking place in it .... 170 



SECTION XIV. 

 THE PROTECTIVE MECHANISMS OF THE EYE. 



806. The Eye-Lids and their Muscles 172 



807- The Conjunctiva and its Glands. Tears. The Secretion of Tears 173 



