INDEX 



433 



Measle-worms, 280 

 Mechanism,, 350, 369 

 ""Mediterranean, former bridge over 



the, 110 



Medium influences, 342 

 Megalosauri, the, 120 

 Memory of birds, in 

 of fishes, 176 

 Memory prodigies, nz 

 Metabolism, 233 

 Middendorf, 108 

 Migration of birds, 98-115 



., ,, altitude of, 99-103 



cause of, 103-5 



speed of, 98-9 

 Migrations of animals, 328 

 Migration routes, 109-10 

 Migratory instinct, the, 103-15 



origin of the, 



103-7 



Military system, evils of the, 415 

 . Mimicr_y, 193-4, 216 

 Mind and matter, 387-8 

 ,, in the animal, 77 

 Mixtures, chemical, 230 

 Mole-cricket, the, 185, 203 

 Monism,389, 425, 426 

 Monstrosities, 348 

 Moral laws, 422 



' sense, evolution of the, 408 

 Morality, science of, 419 

 Mortality greater in males than 



females, 81 

 Mosaic narrative, 38 

 Moth, the, 187, 190 

 Moustache, the military, 90 

 Mucus of the snail, 239, 242 

 Mud-fish, the, 151, 177 

 Mussels, parthenogenetic, 254 

 Mutation theory, the, 344 

 Mutilations, not inherited, 222 

 Mutilation of animals, 140-5 

 Myoxus glis, 56 



NATURAL laws, 380 



selection, 28-9, 40 

 and sexual selection, 79-82 

 selection, description of, 41 

 selection, is it omnipotent ?, 



132 



selection, mechanical, 368 

 Nauplius-larva, the, 246, 251 

 Neanderthal skull, the, 125 

 Nematodes, 271, 277 

 Neo- Vitalism, 352 

 Nerve-tracks, 65 

 Nerves, motor and sensory, 64 

 Nesting-places of birds, 48 



Newt, regeneration in the, 142 



Nietzsche, F., 416 



Nightingale, disappearance of the, 



47 



Novelty, stimulus of, 82 

 Nucleus, importance of the, 295 

 Nut-hatch, the, 52 



ONTOGENY, 247 



Optics, 398 



Organisation, degrees of, 374 



Orgyia, the, 226 



Origin of life, 313-18 



of species, 398 

 Orthogenesis, 340 



,, ideological, 371 



Ova, number and development of, 



26, 359 



Over-production, 25 

 Ovum, the, 255, 303 



structure of the, 223 

 Owl, the, 43 

 Oxyuris, the, 277 



PAINTER'S gaper, the, 175 

 Pairing-cries, 95 

 Pairing of insects, 196 



,, season, date of the, 57 

 Pandorina, the, 297 

 Panmixis, 161 

 Parasites, alimentary organs of, 272 



,, respiratory organs of, 272 



sexual organs of, 273 

 Parasitism, 246, 269-84 

 Parthenogenesis, 253-7 

 Passive selection, 357 

 Peacock's-eye butterfly, the, 189, 220 

 Peacock, tail of the, 87, 93 

 Pentastomum tanioides, 270 

 Perch, the, 1 72 

 Perch-pike, the, 172 

 Peripatus, 264 

 Persistent types, 132 

 Pflliger on the origin of life, 316 

 Phylloxera, the, 43, 254 

 Phytogeny, 247 

 Physical changes of the earth, 327 



conditions of life, 22, 49 



science, 396 

 Pigeons, species of, 29-30 

 Pike, the, 172 

 Pineal body, the, 1 58 

 Pine lappet-moth, 43 

 Plagues of animals, 46 

 Plant-eating animals, 237 

 Plant, evolution of the, 197-9 

 ,, importance of the, 235 

 Plastic types, 132 



2 K 



