CONTENTS. 



CHAPTER XVII. 



PAOB 



Sensation, 1 



Its dlstinctiou from perception, 1. Its cognitive function — 

 acquaintance with qualities, 3. No pure sensations after the first 

 days of life, 7. The ' relativity of knowledge,' 9. The law of 

 contrast, 13. The psychological and the physiological theories 

 of it, 17. Bering's experiments, 20. The ' eccentric projection ' 

 of sensations, 31. 



CHAPTER XVIIL 

 Imagination, 44 



Our images are usually vague, 45. Vague images not neces- 

 sarily general notions, 48. Individuals dili'er in imagination ; 

 Gallon's researches, 50. The 'visile' tj'pe, 58. The 'audile' 

 type, 60. The 'motile' type, 61. Tactile images, 65. The neural 

 process of imagination, 68. Its relations to that of sensation, 72. 



CHAPTER XIX. 



The Pekception of ' Things/ 76 



Perception and sensation, 76. Perception is of definite and 

 probable things, 82. Illusions, 85 ; — of the first type, 86 ; — of 

 the second type, 95. The neural process in perception, 103. 

 'Apperception,' 107. Is perception an unconscious inference? 

 111. Hallucinations, 114. The neural process in hallucination, 

 122. Bluet's theory, 129. ' Perception-time,' 131. 



CHAPTER XX. 

 The Perception of Space, 134 



The feeling of crude extensity, 134. The perception of spatial 

 order, 145. Space-' relations,' 148. The meaning of localization, 

 153. ' Local signs,' 155. The construction of ' real ' space, 166. 

 The subdivision of the original sense-spaces, 167. The sensation 



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