Table of Contents xi 



PAGES 



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 DC 

 Spatially Determined Reactions and Space Perception . 215-244 

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

 rV: 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 W- 

 Reactions Adapted to the Distance of Objects. 70. Some 

 Theoretical Considerations. 



> CHAPTER X 



The Modification or Conscious Processes by iNDiviDtrAL 



Experience 245-285 



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: (6) 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. 



CHAPTER XI 



The Modification of CoNsaotrs Processes by Individual 



Experience 286-313 



76. The Recognition of Landmarks. 77. The Memory 

 IcK^ 78. Conditions Favoring the Development of Memory 

 Ideas, jg. Some Alleged Instances of Remarkable Mental 

 Powers in Animals. 80. Certain Influences Affecting 

 Learning. 



