Perception, a form of immediate knowledge, 10, 13, 17, 18; external and internal, 14; philosophy of, 14, 20, 22, 36, 346, 348, 353, 355, 359; illusions of, 19, 35; psychology of, 20; and inference, 22, 26, 76; physiological conditions of, 31. Persistent objects, representation of, 312. Persistent self. _See_ Personal identity. Personal equation, in perception, 101; in aesthetic intuition, 214; in memory, 292; in belief, 324. Personal identity, consciousness of, 241, 282, 285; illusions connected with, 283; disturbances in sense of, 287; sense of, in insanity, 289; momentary confusions of, 293; philosophic problem of, 285, 354, 360. Personification of nature, 224. Perspective, linear, 79, 97, 98; aerial, 80; of memory, 245. Pessimism, 323, 327. Phenomenalism, 348. Philosophy, conception of illusion by, 7, 36, 205, 285, 349; of mind, 132, 285, 344, 348; as theory of knowledge, 295, 346; and science, 346, 348; and common sense, 347, 349; problems of, 347. Phosphenes, 58. Physical science. _See_ Science. Plato, 281. Platonists, 349. Pleasure, feeling of, 200; recollection of, 264, 270. Plutarch, 133, note[73]. Poetry, lyrical and dreams, 164; misinterpretation of, 223; personification, 224. Points, discrimination of, 52. Poisons, action of, 115. Pollock, F., 184, note[101]. Pollock, W.H., 184. Predisposition, action of, in perception, 44, 101, 102; in aesthetic intuition, 215; in insight, 223; in recollection, 268; in belief, 305, 319; belief as, 324. Prejudice. _See_ Predisposition. Prenatal experience, recollection of, 281. Preperception, 27; illusions connected with, 44, 93; voluntary, 95; result of habit of mind, 101; result of temporary conditions, 102; as sub-expectation, 102; as definite expectation, 106. Presentation and representation, 9, 10, 13, 14, 192, 234, 329, 330. Projection, outward, of sensations, 63; of mental image, 111, 112; of solid form on flat, 79, 81, 96. Prophetic, dreams as, 129, 147, note[88]; enthusiast, 307. Psychology, popular and scientific, 9, 10; distinguished from philosophy, 14, 36, 345, 352; introspective method of, 208; as a kind of philosophy, 305. Public events, localization, of, by memory, 258. R. Radestock, P., 130, note[71], 132, note[72], 134, note[75], 140, 141, 149, note[90], 162, 182, 275. Rationalism, philosophic, 348. Realism, 348. Reality, nature of, 36, 346. Recognition, and perception, 24, 25; illusions of, 87; and memory, 234. Reflection (of light), illusions connected with, 73, 83. Refraction and optical illusion, 73. Relative, sensation as, 64; attention to magnitude and brightness as, 91; estimate of duration as, 249. Relief, illusory perception of, 75, 96.