Table of Contents 



XI 



Gravity : Crustacea. 55. Orientation to Gravity : Spiders 

 and Insects. 56. Orientation to Gravity: Vertebrates. 



57. The Psychic Aspect of Orientation to Gravity. 



58. Orientation to Light. 59. Influences Affecting the 

 Sense of Light Orientations. 60. The Psychic Aspect of 

 Orientation to Light. 61. Mutual Influence of Light and 

 Gravity Orientations. 62. Orientation to Other Forces. 



CHAPTER IX 

 SPATIALLY DETERMINED REACTIONS AND SPACE PERCEPTION 



63. Class III : Reactions to a Moving Stimulus. 64. Class 

 IV: Reaction to an Image. 65. Methods of Investigating 

 the Visual Image. 66. The Visual Perception of Size. 

 67. The Visual Perception of Form. 68. The Homing of 

 Animals as Evidence of Image Vision. 69. Class IV: 

 Reactions Adapted to the Distance of Objects. 70. Some 

 Theoretical Considerations. 



215-244 



CHAPTER X 



THE MODIFICATION OF CONSCIOUS PROCESSES BY INDIVIDUAL 



EXPERIENCE 



71. Modifications Due to Essentially Temporary Physio- 

 logical States: (a) Heightened Reaction as the Result of 

 Previous Stimulation. 72. Modification Due to Essen- 

 tially Temporary Physiological States: (b) Cessation of 

 Reaction to a Repeated Slight Stimulus. 73. Modifica- 

 tions Due to Relatively Permanent Effects of Stimuli. 



74. Learning Involving the Dropping Out of Movements. 



75. The Formation of Systems of Successive Movements. 



245-285 



CHAPTER XI 



THE MODIFICATION OF CONSCIOUS PROCESSES BY INDIVIDUAL 



EXPERIENCE 



76. The Recognition of Landmarks. 77. The Memory 

 Idea. 78. Conditions Favoring the Development of Memory 

 Ideas. 79. Some Alleged Instances of Remarkable Mental 

 Powers in Animals. 80. Certain Influences Affecting 

 Learning. 



286-313 



