468 



INDEX 



Microscopists, 386-389 

 Microsporangium, 108, 110, 112 

 Microspore, 106, 107, 110, 112 

 Microsporophyll, 106, 112 

 Mid-brain, 186 (see Brain) 

 Millipede, 129, 415 

 Mimicry, protective, 323 

 Mirabilis, 284 

 Mistletoe, 68 

 Mitosis, 29, 224-228; typical 



stages in, 225 

 Mitral valve, 165, 172 

 Modifications, 265-267, 302, 304, 



444 



von Mohl, 7 

 Mole, 317 

 Mollusc, 117, 415; development 



of, 255; nerve cells, 194 

 Monads, 52 

 Monographers, 385 

 Monohybrid, 272-276 

 Morphogenesis, 403 

 Morphology, 3 

 Mosaic inheritance, 268 

 Mosquito, 336 

 Moss, 105; classification, 413, 



414; fertilization, 240; life 



history, 100-103 

 Motor nerve, 191 

 Mouth, 41, 119, 121 

 Movement, amoeboid, 19; ciliary, 



19; power of, 19 

 Mulatto, 283-285; recombination 



square, 285 

 Muller, 396 

 Muscles, 18, 138, 139; cells, 59, 



183; involuntary, 139; smooth, 



25; striated, 25; voluntary, 



139; of eye, 201 

 Muscular system, 116 

 Mutations, 269, 298, 306, 377 

 Mycelium, 332 

 Myotome, 139 



Myrsiphyllum, 71 

 Myxedema, 182 



N 



Nails, 138 

 Nares (see Nostrils) 

 Natural history, 2 

 Natural philosophy, 3 

 Natural selection, 306, 374-376, 



378, 411 



Nature versus nurture, 296-299 

 Neo-Mendelism, 282-306 

 Nephridium, 122, 123, 124, 181, 



177, 207 



Nephrostome, 124, 177, 208 

 Nerve, 191; afferent and efferent, 

 192; auditory, 197; cranial, 

 152, 188; motor, 191; optic, 

 152; sensory, 191 ; sensory end- 

 ing, 139; spinal, 188, 190; tem- 

 perature, 312; trophic, 312; 

 vagus, 190; vasomotor, 174, 312 

 Nerve cells, differentiation, 185 

 Nerve cord, 123, 134, 190 

 Nerve fibers, 185 

 Nerve net, 184, 186 

 Nerve plexus, 186, 190, 191 

 Nervous impulse, 191, 193, 194 

 Nervous system, 116, 133; coordi- 

 nation by, 183-193; Crayfish, 

 134; Earthworm, 134; Frog, 190 

 Neural arch, 137, 143 

 Neural canal, 137, 143, 153 

 Neural groove, 186 

 Neural tube, 186, 187, 190 

 Neuro-muscular mechanism, 183 

 Neuron, 184-186, 193, 194 

 Nictitating membrane, 355 

 Nitrates, 36, 43 

 Nitrogen cycle, 49 

 Nitrogen-fixing Bacteria, 49, 333 

 Nitrogenous wastes, 43 

 Nomenclature, Binomial, 391 



