INDEX 



Mechanical stimulation, response 



to, 43 



Medusae of Obelia, 196 

 Megastoma entericum, 338 

 Meissner's corpuscles, 157, 159 

 Memory, associative, 172 



hereditary, 170 

 Mendel, Gregor Johann, 267 



on sex determination, 246 

 Mendelian proportions, diagram 



explaining, 273 

 Mendel's law, 270 

 Menopause, 449 

 Meroblastic egg, 216 

 Mesenchyme, 121 

 Mesoblast, 222 

 Mesoderm, 226 

 Metabolic activity, anabolic, 83 



katabolic, 83 

 Metabolism, 81 

 Metagenesis, 197 

 Metaphase, 105 

 Metaphyta, 93 

 Metastasis, 90 

 Metazoa, 93 

 Metschnikoff on old age, 446 



on phagocytosis, 385 

 Micellae, 258 

 Microcytase, 388 

 Microgromia socialis, 115 

 Micronucleus, 98 

 Micro-organisms. See Bacteria. 

 Microparasites. See Bacteria. 

 Microphages, 388 

 Mimosa, 36 



conductivity in, 69 



effect of light on, 56 



mechanical stimulation, 43 



thermal irritability of, 42 

 Mind, 176 



Minimum temperature, 39 

 Minot, 236 



on senescence, 446 

 Mistletoe, 337 

 Mites, 350 

 Mitochondria, 95 

 Mitosch on grafting, 441 

 Mitosis, 102 



heterotype, 206 



homotype, 205, 206 

 Moisture, influence of, 50 

 Molecular death, 452, 456 



Monogenetic reproduction, 181 

 Monsters, formation of, 239 

 Montague, Lady Mary Wortley, 



391 



Morgan (Lloyd) on instinct, 170 

 Morgan (T. H.) on instincts, 169 



on regeneration, 405, 406 

 Morphalaxis, 406 

 Morris on grafting, 429 

 Morula, 221 

 Mosquitoes, 345 



parasitism of, 332 

 Moss, 323 

 Mother star, 105 

 Motion, 71 

 Motor neuron, diagram of, 151 



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, 



192, 193 



Murphy (J. B.), 438, 457 

 Muscle cells, 80, 129 

 Muscular tissue, atrophic changes 



in, 448 



regeneration of, 414 

 Mutation theory of De Vries, 297 

 Mutilation and regeneration, 401 

 Mutualism, 329 

 Myeloplaxes, 99 

 Myiasis, 343 

 Myograph, 81 



NAGELI on heredity, 258 



Natural immunity, 370 

 selection, 290 



Nebular hypothesis, 18 



Necator americana, 340, 354 



Needham, 24 



Nematoda, 340 



Neo-Lamarckism, 295 



Nephridia, 147 



Nerve-fibers, transmission of elec- 

 tric currents, 63 



Nervous system, atrophic changes 

 in, 450 



