5 o8 



Index. 



Fbitsch, Dr., Fig. of skull of 



Alelanerpcton, 288 

 Fr«g, development of, 6 ; arrest 



of life in, 21; respiration in, 



24 ; fishing, or angler-fish, 91 ; 



modified development of, 214 ; 



effects of simple stimulus on, 



305 

 Fruits and flowers, selection of, 



Gabet, Messrs. Hcc and, on 

 Llama cow, 333 



Galapagos Archipelago, species 

 and varieties in, 99 ; climate 

 of, 109 



Gallus bankiva, 230 



G alton, Mr. Francis, on the 

 coloration of the zebra, 84; 

 his modification of pangenesis, 

 135 ; numerical estimate of in- 

 heritance, 150, 192 ; his inves- 

 tigations on twins, 169; on 

 blended characters, 225; on 

 the steps of evolution, 227 



Ganglia, 31 



Gannet, rate of increase of, 57 



Gus-engine, analogy of, 30 



Gautiek, Theophile, his cat, 264 



GEDDES,Prof. Patrick, and Thom- 

 son, J. A., on anabolism and 

 katabolism, 44; quoted, 50, 

 137, 237 



Gemmules, pangenetic, 131 



Generations, alternation of, 46 



Generic idea, 326 



Geographical barriers a means 

 of segregation, 99 



Geological changes, influence on 

 natural selection, 1 13 



Germ-plasm, continuity of, 138 ; 

 convenience of, 140 



Gills of mussel, 4 ; as respiratory 

 organs, 24 



Giraffe, co-ordinated variations 

 iu, 212 



Gl.ccial epoch, effects of, 113 



Gland, pineal, 2s8 



Goldfinch, song of, 454 



Goldschneider, on ternpera- 

 ture-sense, 249 



Guild, Dr., on humming-birds' 

 nests, 408 



G i: a BEB, Dr., on colour-sensitive- 

 ness of earthworm, 293 



Grant, Mr. G. L., on New Zea- 

 land sparrows, 445 



Grasshopper, auditory organ of, 

 266 



Gregarina, reproduction iu, 3S 



Gkenacher, Dr., experiment on 

 moth's eye, 290 



Grouse, white plumage in, due 

 to reversion. 22ii 



Grove, Sir W. R., on antago- 

 nism, 394 



Growth of organisms, 5 ; illus- 

 tration of a deer's antler, 2~ ; 

 law of, after mutilation, 126 



Guidance distinguished from ori- 

 gin, 242 



Guillemot, eggs of, 410 



Gllick, Rev. J. T., on landshells 

 of Sandwich Islands, 109; on 

 tendency to divergence, 151 



Gippr. Mr., on crab of Solomon 

 Islands, ^7 



Habits of animals, 415 



Habitual activities, 420 ; sense 

 of satisfaction in performance 

 of, 421 



Haeckel, Prof., plastidules of, 

 125 ; theory of perigenesis, 159 



Halictus cylindricus, 90 



Hamerton, Mr. P. G., on the 

 ignorance of animals, 333 



Hamilton, Sir ffra, quoted, 470 



Hancock. Mr. John, on instinct 

 of cuckoo, 437 



Hasse, E , on humble-bees, 259 



Hauser, on cockchafer, 259 



Haxcroft, Mr. J. B., on taste, 

 250 



Hearing, sense of, 261 



Heliconia, 203 



Helix, nemoralis and hortensis, 

 variation of, 75, 217, 226, 239 



Helmholtz, Von, on colour, 277 ; 

 on local signs of retina, 308 



Hen and egg, problem of, 130 



Hensen, on shrimps, 266 



Herbert, Prof. T. M., quoted, 

 471 



Herdman, Prof., on sea-slug 

 (Doris), 84 ; his modification 

 of pangenesis, 135 ; on warn- 

 ing coloration in nudibranchs, 

 252 



Heredity, an organic application 

 of the law of persistence, 62 ; 

 and the origin of variations, 

 122; in protozoa, 123; and re- 

 generation of lost parts, 124; 

 failure of, 192 ; and instinct, 

 435 



Hering, Edward, on organic 

 memory, 62, 475 



Heron, Sir R., on crossing rab- 

 bits, 225 



Herschell, Sir John, on colour, 

 277 



Hertwtg, Richard, observations 

 on Infusoria, 39 



Hicks, on Capricorn beetle, 267 



Hicks' organ, 267 



Hickson, Dr., Fig. of eye of fly, 

 290 



Hipparion, 118 



Hippopotamus, instinctive acti- 

 vities in, 423 



Holland, Sir Henry, on inheri- 

 tance, 223 



Homing faculty of bees, 428 



Horse, two different evolutions 

 of, 118 ; effects of use on digits 

 of, 210 ; sense of pain in, 392 



Howse, Prof., antennule of cray- 

 fish, 259 



Hlber, Pierre, on smell in bees, 

 257 ; judgment and instinct, 

 452 



Hcc and Gabet, Messrs., on 

 Llama cow, 333 



Hcggins, Dr., his dog Kepler, 

 396 



Humming-birds. 110 

 | Humour, sense of, in dog, 406 



Hcxlet, T. H., on limitation of 

 variations, 151; on neurosis 

 and psychosis, 465 



Htatt, Prof., on acceleration and 

 retardation, 221 



Hybrids, fertility of, 105 



Hydra, reproduction of, 14, 41 ; 

 diagram of, 43; artificial divi- 



sion of, 124: budding in, 128; 

 sexual reproduction of, 129 



Hydra tuba, and medusa of aure- 

 lia, 45 



Hydroids, development of, 46; 

 Weismann on, 139 



Hymenoptera, antennary struc- 

 tures of, 297; instincts of social, 

 441, 448 



Ichneumon fly, instinct of, 430 

 Ichthyosaurus, pineal eye of, 2ss8 

 Ictericke, 454 

 Idea of an object, 313 

 Ideas, conceptual, their environ- 

 ment, 485 ; the law of their 

 evolution, 486 

 Idealism, 474 

 Ignorance of animals, 333 

 Image, inverted in retina, 311 

 Imagination, constructive, 325 

 Imitation as a factor in habit or 



instinct, 443, 453 

 Immortality of protozoa, 12 

 Incongruity, elimination by, 486 

 Increase, law of, 58 

 Incubation, instinct of, 434 

 Individuality, a tendency to dif- 

 ferentiation, 183 

 Inference, conscious and uncon- 

 scious, 328; in animals, 361 

 Infertility of isolated forms, 108 

 Infusoria, reproduction in, 39 

 Inheritance, exclusive, a means 

 of isolation, 104 ; of variations, 

 223 ; of acquired habits, 435 ; 

 of acquiied increments of in- 

 tellectual faculty, 497 

 Inhibition, 385; as a condition of 



volition, 459 

 Innate capacity, 422; its impor- 

 tance, 429 

 Insects, tracheal respiration of, 

 3, 24; wingless, of Madeira, 

 81 ; of Kerguelen Island, 81 ; 

 mimicry and protective re- 

 semblance in, 85, 88 ; segrega- 

 tion by colour, 101 ; antennas 

 of, 178 ; mouth-organs of, 179 

 and the evolution of flowers 

 206; sense of touch in, 248 

 taste in, 253; smell in, 257 

 hearing in, 266 ; sight in, 283 

 perceptual powers of, 357 

 neuter, 440 

 Instinct and available advantage, 

 211; consideration of, 415; 

 perfect, imperfect, and incom- 

 plete, 422; deferred, 423 ; blind 

 prevision in, 429 ; gratification 

 in performance of, 430 ; con- 

 sciousness and, 432; primary 

 and secondary, 434 ; three 

 factors in the origin of, 447 ; 

 as influenced by intelligence, 

 452; by imitation, 453; by edu- 

 cation, 455 ; as distinguished 

 from intelligence, 457 

 Instinctive emotion, 390, 395 

 Integration and differentiation, 



183 

 Intellectual development, 486 

 Intelligence involved in selec- 

 tion, 95; distinguished from 

 reason, 330, 365 ; lapsed, 435 

 involved in instinct, 440; as 

 influencing instinct, 452 ; cri- 

 teria of, 456 



