Part 57

Organic nature, results of Darwin's studies of, 215 et seq. See Adaptation and Heredity.

Oriental world of fables, 273.

Orientation, sensations of, 282 et seq.

Oscillation, centre of, 147 et seq.

Ostwald, 172.

Otoliths, 301 et seq.

Overtones, 28, 40, 349.

Ozone, Schöbein's discovery of, 271.

Painted things, the difference between real and, 68.

Palestrina, 44.

Parameter, 257.

Partial tones, 390.

Particles, smallest, 104.

Pascheles, Dr. W., 285.

Paulsen, 338, 340, 373.

Pearls of life, strung on the individual as on a thread, 234-235.

Pencil surpasses the mathematician in intelligence, 196.

Pendulum, motion of a, 144 et seq., increased motion of, due to slight impulses, 21; electrical, 110.

Percepts, of like form, 390.

Periodical, changes, 181; series, 256.

Permanent, changes, 181, 199; elements of the world, 194.

Perpetual motion, a, 181; defined, 139; impossibility of, 139 et seq.; the principle of the, excluded, 140 et seq.; excluded from general physics, 162.

Personality, its nature, 234-235.

Perspective, 76 et seq.; contraction of, 74 et seq.; distortion of, 77.

Pessimism and optimism, 234.

Pharaohs, 85.

Phenomenology, a universal physical, 250.

Philistine, modes of thought of, 223.