INDEX 



1309 



Nerve, influence of constant current on, 263 

 of curare on, 185, 259 

 of drugs on, 260 

 of fatigue on, 259 

 of injury on, 274 

 -junction with muscle fibres, 275 

 law of excitation in, 266 

 medullated, 251 



methods of stimulating, 186-192 

 nature of excitatory process in, 284- 



287 



non-medullated, 252 

 oxygen consumption by, 256 

 polarisation of, 260, 280-283 

 propagation in, 253-255, 281 

 rate of conduction in, 258 

 refractory period of, 273 

 -roots, distribution in cord, 356 

 functions of, 255 

 motor, 322 

 structure of, 250-252 

 summation of stimuli in, 272 

 velocity of conduction in, 253 

 Nerves, ciliary, functions of, 511 

 grafting of, 255 

 inhibitory, 248 

 irritability of, 265 

 Nerve cells, automatic! ty of, 314 

 of brain, 426 

 effects of section of axon on, 



321 



functions of, 310, 312-314 

 liberation of energy in, 313 

 structure of, 300 

 Nervous impulse, 256 



conditions affecting, 258- 



261 



processes, energy of, 464 

 system, blood supply of, 462 

 central, 288-477 

 of Ccelenterata, 289 

 conduction in, 296, 301-389 

 connection with periphery, 



299 



control of co-ordinated 

 movements by, 338-348 

 of crayfish, 294 

 development of, 297 



of control in, 



293 



evolution of, 33, 288-296 

 function of cells in, 312-314 

 higher reflex functions of, 



340^08 



invertebrate, 288-296 

 irreciprocal conduction in, 



302 

 law of forward direction in, 



302 



motor functions of, 434 

 of medusa, 290 

 nutrition of, 461 

 paths in, 299 

 psychical functions of, 433, 



451 



reflex action in, 303-311 

 sensory functions of, 443 

 structure of, 360-389, 415- 



432 

 trophic functions of, 349 



Nervous system, vascular arrangements of, 



461 



of vertebrates, 297-302 

 Nervus erigens, 473 

 Neural groove, 297 

 Neurilemma, 251 

 Neurine, composition of, 57 

 Neuro-blasts, development of, 298 

 Neuro -epithelial cells, 295 

 Neuro-fibrils,251, 296, 307 



of vertebrates, 301 

 Neuro-keratin, 105 

 Neuro-muscular function, 275 

 Neurons, definition of, 295 



nature of connection between, 307- 



311 



Neuro-pilem, 296 



Neutral salts, action on protein, 94 . 

 Nicotine, action on nerve cells, 472 



on nerve endings, 277 

 Nictitating membrane, 515 

 Night blindness, 578 

 Nissl bodies, 301 

 Nitrates, fate in plants, 114 

 Nitrification, 40 

 Nitrogen, assimilation of, 40 

 in cells, 40 



distribution in protein molecule, 90 

 digestion in urine, 802 

 -fixing bacteria, 40 

 source of, 39 

 Nucleic acid, 99 



decomposition of, 102 

 Nuclei of cranial nerves, 376-380 

 Nuclein, 99 



decomposition of, 102 

 fate of, 821 

 formation of, 43 

 metabolism of, 818 

 phosphoproteins con verted into, 116 

 Nucleoplasm, 17 

 Nucleoproteins, 98, 99 



fate in stomach, 733 

 Nucleotides, 103 

 Nucleus, 14, 33 



of Bechterew, 379 

 chemical composition of, 27 

 cuneatus, 365 

 of Deiters, 379, 389, 410 

 functions of, 27 

 gracilis, 365 

 red, 376 

 structure of, 16 

 Nutrition, influence of nervous system on, 



349 



mechanism of, 657-1247 

 Nystagmus, 656 



OCULOMOTOR NERVE, 409, 496 

 (Esophagus, action of, 724 

 Ohm's law (sound analysis), 616 

 Old age, effect on accommodation, 528 

 Olfactometer, 645 

 Olfactory apparatus, 420 



bulb, connection of, 387 



lobe, structure of, 420 

 Olivary body, 366, 381 

 Olivo-spinal tract, 353, 389 

 Ophthalmoscope, 553 

 Opsonins, 1086 



