  | CHAPTER I. | | PAGE | | Introductory | 1 | | Psychology defined; psychology as a natural science, its data, 1. The human mind and its environment, 3. The postulate that all consciousness has cerebral activity for its condition, 5. | | CHAPTER II. | | Sensation in General | 9 | | Incoming nerve-currents, 9. Terminal organs, 10. 'Specific energies,' 11. Sensations cognize qualities, 13. Knowledge of acquaintance and knowledge-about, 14. Objects of sensation appear in space, 15. The intensity of sensations, 16. Weber's law, 17. Fechner's law, 21. Sensations are not psychic compounds, 23. The 'law of relativity,' 24. Effects of contrast, 26. | | CHAPTER III. | | Sight | 28 | | The eye, 28. Accommodation, 32. Convergence, binocular vision, 33. Double images, 36. Distance, 39. Size, color, 40. After-images, 43. Intensity of luminous objects, 45. | | CHAPTER IV. | | Hearing | 47 | | The ear, 47. The qualities of sound, 43. Pitch, 44. 'Timbre,' 45. Analysis of compound air-waves, 56. No fusion of elementary sensations of sound, 57. Harmony and discord, 58. Discrimination by the ear, 59. | | CHAPTER V. | | Touch, the Temperature Sense, the Muscular Sense, and Pain | 60 | | End-organs in the skin, 60. Touch, sense of pressure, 60. Localization, 61. Sensibility to temperature, 63. The muscular sense, 65. Pain, 67. | | CHAPTER VI. | | Sensations of Motion | 70 | | The feeling of motion over surfaces, 70. Feelings in joints, 74. The sense of translation, the sensibility of the semicircular canals, 75. | | CHAPTER VII. | | The Structure of the Brain | 78 | | Embryological sketch, 317. First type: inference of the more usual object, 318. Second type: inference of the object of which our mind is full, 321. 'Apperception,' 326. Genius and old-fogyism, 327. The physiological process in perception, 329. Hallucinations, 330. | | CHAPTER XXI. | | The Perception of Space | 335 | | The attribute of extensity belongs to all objects of sensation, 335. The construction of real space, 337. The processes which it involves: 1) Subdivision, 338; 2) Coalescence of different sensible data into one 'thing,' 339; 3) Location in an environment, 340; 4) Place in a series of positions, 341; 5) Measurement, 342. Objects which are signs, and objects which are realities, 345. The 'third dimension,' Berkeley's theory of distance, 346. The part played by the intellect in space-perception, 349. | | CHAPTER XXII. | | Reasoning | 351 | | What it is, 351. It involves the use of abstract characters, 353. What is meant by an 'essential' character, 354. The 'essence' varies with the subjective interest, 358. The two great points in reasoning, 'sagacity' and 'wisdom,' 360. Sagacity, 362. The help given by association by similarity, 364. The reasoning powers of brutes, 367. | | CHAPTER XXIII. | | Consciousness and Movement | 370 | | All consciousness is motor, 370. Three classes of movement to which it leads, 372. | | CHAPTER XXIV. | | Emotion | 373 | | Emotions compared with instincts, 373. The varieties of emotion are innumerable, 374. The cause of their varieties, 375. The feeling, in the coarser emotions, results from the bodily expression, 375. This view must not be called materialistic, 380. This view explains the great variability of emotion, 381. A corollary verified, 382. An objection replied to, 383. The subtler emotions, 384. Description of fear, 385. Genesis of the emotional reactions, 386. | | CHAPTER XXV. | | Instinct | 391 | | Its definition, 391. Every instinct is an impulse, 392. Instincts are not always blind or invariable, 395. Two principles of non-uniformity, 398. Enumeration of instincts in man, 406. Description of fear, 407. | | CHAPTER XXVI. | | Will | 415 | | Voluntary acts,
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