Part 17 (2/2)

Organ, bellows of an, 135.

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, SchAbein'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 surpa.s.ses 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.

Philology, comparison in, 239.

Philosopher, an ancient, on the moral and physical sciences, 89.

Philosophy, its character at all times, 186; mechanical, 155 et seq., 188, 207, 259 et seq.

Phonetic alphabets, their economy, 192.

Photography, by the electric spark, 318 et seq.

Photography of projectiles, 309-337.

Photography, stupendous advances of, 74.

Physical, concepts, fetis.h.i.+sm in our, 187; ideas and principles, their nature, 204; inquiry, the economical nature of, 186; research, object of 207, 209.

Physical phenomena, as mechanical phenomena, 182; relations between, 205.

Physico-mechanical view of the world, 155, 187, 188, 207 et seq.

Physics, compared to a well-kept household, 197; economical experience, 197; the principles of, descriptive, 199; the methods of, 209; its method characterised, 211; comparison in, 239; the facts of, qualitatively h.o.m.ogeneous, 255; how it began, 37; helped by psychology, 104; study of its own character, 189; the goal of, 207, 209.

Physiological psychology, its methods, 211 et seq.

Physiology, its scope, 212.

Piano, its mirrored counterpart, 100 et seq.; used to ill.u.s.trate the facts of sympathetic vibration, 25 et seq.

Piano-player, a speaker compared to, 192.

Picture, physical, a, 110.

Pike, learns by experience, 267.

Pillars of Corti, 19.

Places, heavy bodies seek their, 224 et seq.

Planetary system, origin of, ill.u.s.trated, 5.

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