A
- Abstract ideas, 322, 363
- Acceleration, sense of, 269
- Acceleration and retardation, 221
- Achirus pellucidus, 83
- Acquired characters, are they transmitted? 147;
- Acræa, 203
- Activities, organic basis of comparative psychology, 337;
- Adaptation, analogous, 117;
- Advantage must be particular, 184;
- Æschna, 289
- Æsthetic preferences in insects and birds, 207;
- Alexander, Mr. S., "Moral Order and Progress," 463
- Allen, Mr. Grant, on evolution of flowers, 206;
- on pleasure and pain, 380
- Allen, Mr. J. A., on colour and humidity, 164
- Alternation of generations, 46
- Amblyopsis spelæus, 271
- American school of evolutionists, 221
- Amœba, how it feeds, 5;
- Amphibia, labyrinthodont, 288
- Anabolism, constructive process, 32
- Analysis (mental), 321
- Ancon sheep, 226
- Anderson, Mr., on one-eared rabbits, 226
- Anemone, sea, reproduction of, 41;
- Anger and rage, 389
- Animal life, nature of, 1;
- diversity of, 177
- Animal intelligence, differs generically from man's reason, 350
- Animals, characteristics of, 1;
- Animistic ideas of savages, how developed, 494
- Anisognathus, 226
- Anomia, 265
- Ant, sauba, of South America, 213;
- Antagonism, advantages of, 394
- Antennæ of insects, modifications of, 178;
- Antennule of crayfish, 259
- Anthophora, 438
- Anticipation, 327
- Antlers of deer in illustration of growth, 28
- Aphides, absence of fertilization in reproduction, 44
- Appetence and aversion, 343, 384
- Apus, 46
- Aquatic organisms, respiration in, 4;
- sense of smell in, 256
- Arago, M., observation on turnspit dog, 404
- Arctic hare and fox, 84;
- Argyle, Duke of, on humming-birds, 110
- Artemia salina and milhausenii, 164
- Artistic faculties and natural selection, 484;
- products, evolution of, 489
- Association a tendency to integration, 183;
- Ateles, 210
- Atmosphere, relations of animals and plants to, 15
- Attacus, 179
- Attention, 342
- Attidæ, 208
- Auditory apparatus in man, 262
- Aurelia, life-cycle of, 45
- Australian mammals and others convergent, 117
- Automatic action, 415
- Available advantage, 188, 211
- Aversion and appetence, 343, 384
B
- Baboon, experiments with, 352
- Bacilli attacked by leucocytes, 439
- Bacillus violaceus, 80
- Bailey, Mr. E. H. S., on taste, 251
- Balbiani on Chironomus, 137
- Balistes, 179
- Barrett, Mr. W. F., on sensitive-flame experiment, 298
- Barrier, geographical, 99;
- time, in physiological isolation, 105
- Barrington, The Hon. Daines, on song of linnet, 454
- Bateson, Mr. W., on lateral line, 252;
- Bats, tabulated measurements of wing-bones of, 65-73;
- Beauty, standard of, 206;
- sense of, 407
- Beaver, change of habit in, 445
- Beccari on gardener bower bird, 408
- Becker, Alexander, on variations in the balance of life, 112
- Bees, divergent development of, 58;
- Beetles of Madeira, 81;
- Begging in dogs, 345
- Berkeley, Bishop, quoted, 475
- Bert, M. Paul, limits of sensibility to light, 296
- Bidie, Mr. George, anecdote of cat, 370
- Binet, M., "Psychic Life of Micro-organisms," 360
- Birds, influence of food-yolk on development of, 56;
- divergence among, 97;
- breeding area of comparatively restricted, 101;
- humming, Duke of Argyle on, 110;
- destruction of eggs of, 189;
- game-, white and black crossed, 225;
- taste in, 251;
- smell in, 256;
- hearing in, 264;
- sight in, 284;
- colour-vision in, 285;
- gardener bower, 408;
- humming, nests of, 408;
- perfect instincts of prœcoces, 424;
- love antics of satin bower, 450;
- nests of, 453;
- song of, 454
- Blochmann on the development of the drone, 153
- Blood, circulation of, 22
- Body as distinguished from reproductive cells, 131
- Boll and Kühne, Messrs., on retinal purple, 276
- Bolton, Miss Caroline, on the bat, 247
- Bombus muscorum, 90;
- lapidarius, 91
- Bombyx quercus, 258
- Bower bird, 408, 450
- Brain, 31;
- Brehm's, Thierleben, quotation from, 405
- Brine shrimp, modified by salinity of water, 164
- Brooks, Prof. W. K., his modification of pangenesis, 134;
- on the greater variability of the male, 237
- Brown, Prof. Crum, on sense of acceleration, 270
- Browne, Sir J. Crichton, on ducks, 171
- Budding, reproduction by, 42;
- in relation to heredity, 128
- Bull, "Favourite," prepotent, 227;
- reversion in, 229
- Bunyan, John, on gateways of knowledge, 311
- Butler, Mr. Samuel, on organic memory, 62, 475
- Butterfly, protective resemblance in, 86;
- mimicry in, 87
C
- Camel, wounded, 392
- Canary, crested, 225;
- nest building of, 453
- Capon, taking to sitting, 228
- Capuchin monkey, Miss Romanes's observation on, 367;
- sympathy in, 397
- Carlyle, quoted, 331, 335
- Carp at Potsdam, 265
- Carter, Dr. Brudenell, quoted, 285
- Caste, idea of, in dog, 400
- Cat, effect of African climate on, 164;
- Caterpillars, protective resemblance in, 82
- Cattle of Falkland Islands, 203
- Causation, 327
- Cell, diagram of animal, 10;
- controlled explosions in, 31
- Cessation of selection, effects of, 172
- Chætodon, 83
- Chætogaster limnæi, reproduction of, 42
- Chaffinch, nest of New Zealand, 454
- Chamæleon, 286
- Chance, 236
- Change of conditions, 163
- Characters, specific, 110
- Charbonnier, Mr, Henry, measurements of bats, 63
- Chattock, Mr. A. P., his experiments on colour-vision, 280;
- letter to, on dog and picture, 341
- Cheshire, Mr., on smell-hollows in bees, 259
- Chickens' aversion to protected caterpillars, 352;
- perfectly instinctive activities, 424
- Chironomus, reproductive cells of, 137
- Choice, 458
- Circulation of the blood, 22
- Classification, 323
- Clifford, W. K., on human consciousness, 341;
- Clover and bees, 113
- Clytus arietis, 87
- Cockchafer, smell-hollows of, 259
- Cockerell, Mr., on variations in snails, 75;
- on effects of moisture, 239
- Cockroach, diagram of trachea or air-tubes of, 3;
- Cocoon, collective, 429
- Colobus, 210
- Colour, protective resemblance in, 82;
- Combination, organic, hypothesis of, 150, 240
- Communication in dogs, 345;
- in bees, 358
- Compensation of growth, 155
- Competition, elimination through, 89
- Concept, 325, 326
- Conception, 325
- Conceptual conduct and evolution, 488
- Condor, rate of increase of, 57
- Conduct, 463;
- Congruity, principle of, 486
- Conjugation in protozoa, 39;
- of ovum and sperm-cell, 42
- Consciousness, 32;
- Consentience, 326, 362
- Construct and construction (mental), 312;
- Continuity of reproductive cells, 131;
- Convergence, phenomena of, 117
- Co-ordinants, 303
- Cope, Prof., on the effects of use, 210;
- and Hyatt, Prof., on retardation and acceleration, 221
- Correlated variation, 59, 216
- Corti, organ of, 263
- Coryne, Prof. Weismann on, 139
- Couch, Mr., on goldfinch song, 454
- Crab, protective resemblance in, 87;
- Crayfish, smell in, 259;
- auditory organ of, 266
- Crossing, effect on reversion, 230
- Cruelty in cat, objective, 400
- Crustacea, eyes of, 292
- Ctenomys, 194
- Cuckoo, the name onomatopoetic, 322;
- Curiosity in prong-horn, 339
- Cuttlefish, eyes of, 293
- Cyclas, 265
- Cycloptera speculata, locust resembling leaf, 86
D
- Dallinger, Dr., his temperature-experiments on monads, 147
- Danais, 203
- Daphnids, absence of fertilization in reproduction of, 45;
- Darwin, Charles. Natural selection and the struggle for existence, 77;
- divides the principle of selection into three kinds, 78;
- on selection of flowers and fruits by insects, 93;
- on sexual selection, 94;
- on prevention of free crossing in breeding, 99;
- on differential fertility, 104;
- on London rats, 106;
- on Galapagos archipelago, 109;
- on diverse adaptation, 111;
- on the influence of old maids on clover crops, 113;
- on the influence of parent on offspring, 122;
- on the co-ordinating
- power of her organization, 125;
- hypothesis of pangenesis, 131;
- on fur of arctic animals, 165;
- changes of structure attributed to use and disease, 171;
- on blindness of tuco-tuco, 194;
- on the principle of economy, 194;
- on sexual selection, 198;
- on preferential mating, 204;
- on evolution of flowers, 205;
- on co-ordinated variations in the elk, 213;
- on acceleration, 222;
- on ancon sheep, 226;
- on prepotency, 227;
- on reversion, 229;
- on the effects of crossing, 230;
- on fortuitous variation, 236;
- on the subordination of the conditions to the organism, 236;
- on the greater variability of male, 237;
- on attention in monkeys, 342;
- on brain of ant, 358;
- on gestures of anger and rage, 389;
- on pleasures and pains of animals, 394;
- on bravery of a monkey, 396;
- on Abyssinian baboons, 405;
- on sense of humour in the dog, 406;
- on neuter insects, 440;
- on selection of oxen, 441;
- on acquisition of fear of man by birds, 443;
- on satin bower bird, 450
- Death, natural introduction of, 186, 193
- Deceit in dogs, 400
- Degeneration, 183
- Desert animals, inconspicuousness of, 89
- Descartes on pineal gland, 288
- Desire, 460, 463
- Destruction, indiscriminate, as opposed to elimination, 76
- Development of organisms distinct from growth, 6;
- De Vries, 132, 159
- Differentiation in protozoa, 40;
- Difflugia, 360
- Dimorphism in larvæ, 187
- Discrimination in the sense of touch, 245;
- Disease, elimination by, 80
- Display, 207
- Disuse, panmixia and, 189;
- Divergence among birds, illustrated
from Wallace, 97;
- through diverse adaptation, 111
- Dixon, Mr. Charles, effects of climate on the colours of birds, 164;
- on chaffinch nests, 454
- Dog, effect of Indian climate on, 164, 167;
- greyhounds in Mexico, 167;
- sense of smell in, 255, 338;
- vague percept of, 339;
- and the feelings of other animals, 340;
- and pictures, 341;
- powers of communication, 344;
- swimming rivers, 365;
- cleverness of, 367;
- sympathy in, 397;
- idea of caste, deceit, 400;
- endurance of pain, 402;
- sense of justice in, 404;
- punishing pup, 405;
- sense of humour in, 406;
- swimming a deferred instinct in, 423;
- turning round to make a couch, 444
- Dog-fish, sense of smell in, 257
- Domestication, variations effected by, 171, 215;
- crossing and reversion, 230
- Doris tuberculata, 84
- Dreaming, 341;
- and the animistic hypothesis, 495
- Dromia vulgaris, 457
- Drones developed from unfertilized ova, 45;
- second polar cell extruded, 153
- Dubois, M., on Proteus, 294
- Ducks, Sir J. Crichton Browne on, 171;
- Dr. Rae on instinctive wildness of, 435
- Duration of life, 186
E
- Eagle, sclerotic plates of, 437
- Ear, 263
- Earthworm, respiration in, 4, 24;
- Eaton, Rev. A. E., on insects of Kerguelen Island, 81
- Ecitons, 427
- Economy, principle of, 194
- Education of ants, 428;
- of young animals, 455
- Egg and hen, problem of, 130
- Egg-cell and sperm-cell, diagram of, 13;
- conditions which determine production of, 60
- Eggs, influence of food-yolk on mode of development of, 56;
- destruction of birds, 189
- Ego, or self, 475
- Eimer, Prof., on inhabitants of Nile valley, 165;
- Eject, meaning of, 476
- Elaboration, 183
- Elephant, rate of increase of, 57;
- Elimination, as opposed to selection, 79;
- Embryology negatives preformation, 50
- Emotions exemplified, 382;
- Encystment, 38, 49
- Ends and means, 371
- Energy, relations of animals and plants to, 16
- Ennomos tiliaria, caterpillar, protective resemblance of, 85
- Environment, direct effects of on the organism, 163;
- Equus, 118
- Eristalis tenax, 87
- Ethics in animals, 413
- Euplæa, 203
- Evolution of older writers, 50;
- Excrement of birds, resemblance of spider to, 90
- Excretion, an essential life-process, 3, 29
- Expectation, 327
- Experience dependent on memory, 305
- Expression of the emotions, 385
- Eye, structure of in man, 274;