470 



INDEX 



Mobius, 46, 73 

 Modifications, 427, 431 



defined, 399 

 Moina, 251 

 Moles, 1 30 

 Molluscs, 258 

 Moloch, 282 

 Monads, 220 



- structure of, 225 

 Monitors, 282 



Monkeys, mutual aid among, 



77, 78 



Monotremes, 307 

 Montaigne, 158 

 Morgan, Lewis, 79 

 -Lloyd, 159. 168 



T. H., 403 

 Morphology, 188 

 Morula, 313 

 Mosquito, 238, 329 

 Moss-insect, 59 

 Moth and candle, 164 

 Mother-of-pearl, 260 

 Motor nerves, 140, 163 

 Moulting of Puffin's bill, 395 

 Mountain hare, 53 

 Movement, 15 



Movements of animals, 133, 141, 

 159 



of insects, 256 



of molluscs, 252 



- of sea-urchin. 244 



- of snakes, 284 

 Mud-fishes, 274 

 Miiller, August, 217 



Fritz, 64, 92, 317 

 Miillerian mimicry, 64 

 Multiplication, 182 



- of animals, 34 

 Murray, Sir John, 5 

 Muscle, contraction of, 210 



influence of exercise on, 384 

 Muscles, insertion of, 214 



-of ear, 213 



Muscular activity, 141, 144 

 tissue, 197 

 Mussel, freshwater, 114 

 Mutations, 340, 426 

 Mutual aid, 36, 43 

 - among ants, 89 



Myriopods, 252 

 Myrmecobius, 293 

 Myrmecocystus, 86 

 My sis-larva, 317 

 Myxine, 271 

 Myzostomata, 246 



Nais, 238, 241 



Naja, 285 



Nansen, 272 



Natural selection, 422, 423, 429, 



430, 431 



Nature and nurture, 402 

 Nauplius, 249, 251, 318, 319 

 Neanderthal man, 359 

 Neger, 129 



Nemathelminthes, 238 

 Nematodes, 238 

 Nemerteans, 237 

 Neomenia, 259 

 Nephelis, 242 

 Nereis, 239, 241 

 Nerve-cells, 358 

 Nerve-cord, 266 

 Nervous system, 139 

 Nests, 287 



Network of protoplasm, 204 

 New World monkeys, 295 

 New Zealand lizard, 282, 349 

 Newts, 278 



Night-light Infusorians, 3 

 Nine- eyes, 271 

 Nitrogenous waste, 152 

 Noctiluca, 221 

 Nostril of fishes, 275 

 Notochord, 211, 266 

 Notodelphys, 119 

 Notoryctes, 293 

 Nototrema, 119 

 Nougaret, 409 

 Nuclear division, 203 

 Nuclein bodies, 393 

 Nucleolus, 199 

 Nucleus, 198, 311 

 Nudibranchs, 260 

 Number of cells, 201 

 of chromosomes, 202, 310 

 Numbers of animals, 13 

 Nurture, 370, 402 

 Nutrition and evolution, 391 



