432 



INDEX 



Histological selection, 333 

 Historian, work of the, 399 

 Historical science, 397 

 History of civilisation, 414 

 Honey in plants, 199 

 Horse, evolution of the, 39 



„ toes of the, 157 

 Horse-leech, the, 268 

 Humanity, true and false, 414 

 Hydra, 285 



Ichneumon-flies, 44 

 Ichthyosauria, the, 120 

 Iguanodon, the, 120 

 Imago, 185, 187 

 Imagination, 71 

 Imbauba, 286 



Imitation, instinct of, 64, 75 

 Immortality of the getm-cells, 306 

 „ ,, protozoa, 307-10 



Incomprehensibility of the world, 



377 

 Indifferent marks of organisms, 



163 

 Individuahty, 406 

 Individual the only reality, 395 

 Infection of germs, 223 

 Infertility of mixed crossing, 328 

 Infinity, 362 

 Infusoria, 293 



„ will survive man, 374 

 Inheritance of acquired characters, 



204, 222-4 

 Inheritance of impressions, 340 

 Inherited habits, 214 

 Inorganic matter has psychic pheno- 

 mena, 404 

 Insects, adaptations of, 185 

 „ growth of, 186 

 „ origin of wings of, 137 

 Insectivorous birds, 43-5 

 Instinct and intelligence compared, 



66-7 

 Instinct, nature of, 64-6 

 Instincts, origin of, 214 

 Instrumental music of birds, 96 

 Intelligence, animal, 55 



„ and instinct, 66-7 



„ of insects, 216 



Intermaxillary bones, the, 154 

 Intestinal worms, eggs of the, 26 

 Isolation as an evolutionary factor, 

 261, 325-31 



Jay, song of the, 96 

 Japan, no singing birds in, 78 

 Judgments, 378 

 Jurassic period, 1 19 



Kant, 389 

 Kingfisher, the, 45, 46 



Lamarck, theory of, 40 

 Lamarckian principle, the, 167, 191, 



203-227 

 Lamarckian principle, the teleologi- 



cal, 371 

 Language, scientific value of, 377 

 Lappet-moth, the, 193 

 Larvas, 185, 187 

 Last men, the, 420 

 Laws of science, 397, 401 

 Leaf-cutter ants, 286 

 Leech, the, 268 

 Legs, development of, 168 

 Leptocepkalus brevirosiris, 179 

 Lepus Huxleyi, 34 

 Leuckart, R., on parasites, 269 

 Libellula depressa, 195 

 Lichen, the, 286 

 Life, duration of, 312 



,, origin of, 313-6 



„ historical conception of, 426 



,, nature of, 232 



„ phenomena of, 233 

 Limbs, evolution of the, 157 

 Linnean principle, the, 34 

 Lion, mane of the, 88 

 Living substance, 232 

 Lizard, intelligence of the, 138 



„ tail of the, 141 

 Love-dance, the, 85, 87 

 Love-play, 76 

 Lumbriculus, 267 

 Lungs, origin of the, 152 



„ of snails, 240, 244 



Mach^rodus, the, 126-8 



Magnetic sense in the bird, 108 



Males, fights of the, 84 



Mammal and the bird compared, 52 



Man and the animal not specifically 

 different, 77 



Mantis, the, 196, 216 



Marmot, the, 107 



Marten, the, 29 



Masticators, evolution of, 202 



„ of the Crustacea, 246 



Mastodonsauri, the, 121 



Material world, a process of con- 

 sciousness, 387 



Materialism, 385 



Maturing of the germ-cells, 322 



Maw-worm, the, 265, 272 

 „ eggs of the, 26 



May-flies, 19, 22 



Meadow-sage, the, 201 



