452 



INDEX 



Myiasis, 329 

 Myograph, 81 



N 



NAGELI on heredity, 246 



Natural immunity, 356 

 selection, 278 



Nebular hypothesis, 18 



Necator americana, 326, 340 



Needham, 24 



Nematoda, 326 



Neo-Lamarckism, 283 



Nephridia, 148 



Nerve-cells, development of, 

 150 



Nerve-fibers, transmission of elec- 

 tric currents, 63 



Nervous system, atrophic 



changes in, 436 

 development of, 149 

 tissue, regeneration of, 400 



Nettling cells, 126, 128 



Neuromuscular cells, 150 



Neurone, motor, diagram of, 

 129 



Neurophages, 437 



Neutrophilic granules of leuco- 

 cytes, 95 



Nose, restoration by grafting, 

 413 



Nuclear membrane, 98 

 spindle, 105 



Nuclein, 98 



Nucleolus of the cell, 98 



Nucleus of the cell, 97 

 division of, 102 



Nussbaum, 247 



Nutrition, holophytic, 90 

 holozoic, 90 



Nuttall and Buchner, 373 

 on blood relationship 305 



o 



OBELIA, reproduction in, 184 



Obligatory parasite, 318 



Occasional parasites, 318 



Oken's classification, 295 



Old age, 429 



Olfactory organs, development 

 of, 166 



Omne vivum ex vivo, 28 



Ontogenesis, 197 



Oogenesis, 192, 194 



Oogonium, 178 



Opalina, 324 



Opsonins, 375 



Optimum temperature, 39 



Orbitolites, 113 



Orders, 297 



Organ of Corti, 166 



Origin of life, 20 



"Origin of Species," 276 



Omithodorus moubata, 335 



Otocysts, 165 



Otoliths, 165 



Ova, 192 



Ovid on spontaneous genera- 

 tion, 21 



Ovists, 200 



Ovum, fertilization of, 195, 196 

 segmentation of, 205 

 mammalian, 100 



Owen, 190 



Ox-warble, 330 



Oxygen, fish and, 54 

 stimulating effects of, 52 



Oxygenation of blood, 145 



Oxytropism, 52 



Oxyuris vermicularis, 326, 340 



P^DOGENESIS, 199 

 Paleontology, 291 



