INDEX 



451 



Maximum temperature, 39 



McCallum on grafting, 427 



McClung, 232 



Mechanical stimulation, re- 

 sponse to, 43 



Medusae of Obelia, 184 



Megastoma entericum, 324 



Meissner's corpuscles, 160, 162 



Mendel, Gregor Johann, 255 

 on sex determination, 234 



Mendelian proportions, diagram 

 explaining, 261 



Mendel's law, 258 



Menopause, 435 



Meroblastic egg, 204 



Mesenchyme, 121 



Mesobiast, 210 



Mesoderm, 213 



Metabolic activity, anabolic, 83 

 katabolic, 83 



Metabolism, 81 



Metagenesis, 185 



Metaphase, 105 



Metaphyta, 93 



Metastasis, 90 



Metazoa, 93 



Metchnikoff on old age, 432 

 on phagocytosis, 371 



Micella*, 246 



Microcytase, 374 



Microgromia socialis, 115 



Micronucleus, 98 



Micro-organisms. See Bacteria. 



Microparasites. See Bacteria. 



Microphages, 374 



Mimosa, 36 

 conductivity in, 69 

 effect of light on, 56 

 mechanical stimulation, 43 

 thermal irritability of, 42 



Minimum temperature, 39 



Minot, 223; on senescence, 432 



Mistletoe, 323 



Mites, 336 



Mitosch on grafting, 427 



Mitosis, 102 



heterotype, 194 



homotype, 192, 194 

 Moisture, influence of, 50 

 Molecular death, 438 

 Monogenetic reproduction, 169 

 Monsters, formation of, 227 

 Montague, Lady Mary Wortley, 



377 

 Morgan on regeneration, 391, 



392 



Morphalaxis, 392 

 Morris on grafting, 415 

 Morula, 209 

 Mosquitoes, 331 



parasitism of, 318 

 Mother star, 105 

 Motion, 71 

 Motor neuron, diagram of, 129 



system, development of, 125 

 Moulds and moisture, 51 



effect of gravity on, 64 

 Movement, amoeboid, 74 



ciliate, 76 



contractile, 80 



cytoplasmic, 72 



flagellate, 76 

 Mucor mucedo, reproduction in, 



180, 181 



Murphy (J. B.), 424 

 Muscle cells, 80, 130 

 Muscular tissue, atrophic 



changes in, 434 

 regeneration of, 400 

 Mutation theory of De Vries, 



285 



Mutilation and regeneration, 387 

 Mutualism, 315 

 Myeloplaxes, 99 



