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of motion over surfaces, 171. The measurement of the sense-spaces by each other, 177. Their summation, 181. Feelings of movement in joints, 189. Feelings of muscular contraction, 197. Summary so far, 202. 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. Discussion of Wundt's and Helmholtz's reasons for denying that retinal sensations are of extension, 248. Summary, 268. Historical remarks, 270.

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.

'Recepts,' 327. In reasoning, we pick out essential qualities, 329. 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.

The diffusive wave, 373. Every sensation produces reflex effects on the whole organism, 374.

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