iv CONTENTS. 



PAGE 



of motion over surfaces, 171. The measurement of the sense- 

 spaces by each other, 177. Their summation, 181. Feelings of 

 movemeut ia joints, 189. Feelings of muscular contraction, 197. 

 Summary so far, 203. How the blind perceive space, 203. 

 Visual space, 211. Helmholtz and Reid on the test of a sensation, 

 216. The theory of identical points, 222. The theory of projection, 

 228. Ambiguity of retinal impressions, 231 ; — of eye-movements, 

 234. The choice of the visual reality, 237. Sensations which 

 we ignore, 240. Sensations which seem suppressed, 243. Dis- 

 cussion of Wuudt's and Helmholtz 's reasons for denying that 

 retinal sensations are of extension, 248. Summary, 268. His- 

 torical remarks, 270. 



CHAPTER XXL 



The Perception OF Reality, . . . . . . 283 



Belief and its opposites, 283. The various orders of reality, 

 287. ' Practical ' realities, 293. The sense of our own bodily 

 existence is the nucleus of all reality, 297. The paramount reality 

 of sensations, 299. The influence of emotion and active impulse 

 on belief, 307. Belief in theories, 311. Doubt, 318. Relations 

 of belief and will, 320. 



CHAPTER XXII. 

 Reasoning, 323 



' Recepts,' 327. In reasoning, we pick out essential qualities, 

 829. What is meant by a mode of conceiving, 332. What is 

 involved in the existence of general propositions, 337. The two 

 factors of reasoning, 340. Sagacity, 343. The part played by 

 association by similarity, 345. The intellectual contrast between 

 brute and man : association by similarity the fundamental human 

 distinction, 348. Different orders of human genius, 360 . 



CHAPTER XXIII. 

 The Production of Movement, ..... 373 



The diffusive wave, 373. Every sensation produces reflex 

 effects on the whole organism, 374. 



CHAPTER XXIV. 

 Instinct, . ' "^^^ 



Its definition, 383. Instincts not always blind or invariable, 

 389. Two principles of non -uniformity in instincts : 1) Their 

 inhibition by habits, 394 ; 2) Their transitoriness, 398. Man has 



