INDEX 



435 



Motor neuron, diagram of, 127 



system, development of, 123 

 Moulds and moisture, 51 



effect of gravity on, 64 

 Movement, amoeboid, 74 



ciliate, 76 



contractile, 80 



cytoplasmic, 72 



flagellate, 76 

 Mucor mucedo, reproduction 



in, 178, 179 

 Muscle cells, 80, 128 

 Muscular tissue, atrophic 



changes in, 419 

 regeneration of, 384 

 Mutation theory of De Vries, 



269 



Mutilation and regeneration, 371 

 Mutualism, 299 

 Myeloplaxes, 97 

 Myiasis, 313 

 Myograph, 81 



N 



NAGELI on heredity, 232 

 Natural immunity, 340 



selection, 262 

 Nebular hypothesis, 18 

 Necator americana, 310, 324 

 Needham, 24 

 Nematoda, 310 

 Neo-Lamarckism, 267 

 Nephridia, 146 



Nerve-cells, development of, 148 

 Nerve-fibers, transmission of 



electric currents, 63 

 Nervous system, atrophic 



changes in, 420 

 development of, 147 



tissue, regeneration of, 384 

 Nettling cells, 124, 126 

 Neuromuscular cells, 148 



Neurone, motor, diagram of, 

 127 



Neurophages, 421 



Neutrophilic granules of leuco- 

 cytes, 94 



Nose, restoration by grafting, 

 397 



Nuclear membrane, 97 

 spindle, 103 



Nuclein, 97 



Nucleolus of the cell, 97 



Nucleus of the cell, 96 

 division of, 101 



Nussbaum, 233 



Nuttall and Buchner, 357 



Nuttall on blood relationship, 289 



OB ELI A, reproduction in, 182 

 Obligatory parasite, 302 

 Occasional parasites, 302 

 Oken's classification, 279 

 Old age, 413 

 Olfactory organs, development 



of, 164 



Omne vivum ex vivo, 28 

 Ontogenesis, 193 

 Oocyte, 191 

 Oogenesis, 190 

 Oogonium, 176 

 Opalina, 308 

 Opsonins, 359 

 Optimum temperature, 39 

 Orbitolites, 111 

 Orders, 281 

 Organ of Corti, 164 

 Origin of life, 20 

 "Origin of Species," 261 

 Ornithodorus moubata, 319 

 Otocysts, 163 

 Otoliths, 163 

 Ova, 189 



