INDEX 



737 



N:C ratio in faeces, 90. 



in proteid, 92. 



in urine, 90. 



Narcotics, physiological effect of, 65. 

 Nasal breathing compared with mouth breath- 

 ing, 323. 

 Nasal cavity, closed in swallowing, 281. 



closed in vomiting, 286. 

 Native proteids, 73. 

 Nature, limits of knowledge of, 452. 

 Negative pressure in thorax, 310. 

 Negative variation, 433. 

 Nerve abducens, etc., see under individual 



names. 

 Nerve cells, central functions of, 566, 582. 



dependence of, on blood supply, 572. 



mode of reaction of, 570. 



morphological changes in, 574. 



nutritive functions of, 567. 



physiological stimuli of, 569. 



physiology of, 559 seq. 



regeneration and reproduction of, 574. 



rhythm of discharge of, 572. 

 Nerve centers, fatigue of, 676, 678. 



in spinal cord, 585; see also Spinal cord. 



in medulla oblongata, 603; Fig. 269; see 



also under individual names. 

 Nerve endings, of pain nerves, 467, 468. 



of pressure nerves, 461, 468. 



of temperature sense, 461, 468. 

 Nerve fibers, autochthonous, 575. 



autonomic, 686. 



degeneration in, 567. 



origin of, from nerve cells, 559. 



physiological differences between afferent 

 and efferent, 565. 



pre-ganglionic and post-ganglionic, 686, 687. 



regeneration of, 564. 



Nerve fibrils as conducting elements, 560, 585. 

 Nerve impulse, rate of transmission of, in 

 motor nerves of lower animals, 417, Fig. 

 155. 



in motor nerves of man, 418. 

 in spinal cord, 589. 

 Nerve processes, 559. 

 Nerves, accelerator, 191, 688. 



action currents in, 48, 431. 



afferent, 564, 565. 



alterations of excitability in, 425. 



anelectrotonus in, 425; Fig. 162. 



carbon dioxide formed in, 434. 



cardiac, 188 seq. 



catelectrotonus in, 424, Fig. 161. 



classification of, according to function, 564. 



depressor, of heart, 193, 681. 



efferent, 564, 565. 



electrical excitation of, 418. 

 general law of, 420. 



electrolysis in, 434. 



Nerves, fatigue of, 442, 443. 



general properties of, 410, 411. 



heat production in, 402. 



inhibitory, 188. 



intercostal, 324. 



isolated conduction in, 411. 



mechanical stimulation of, 418. 



motor, of bladder, 393. 



of stomach, 284, Fig. 114; see also Stomach. 

 of throat, 282, Fig. 113. 



polar law of excitation of, 424. 



Pfliiger's law of contraction of, 59, 423. 



promoting, 192. 



pulmonary, 681. 



rate of transmission in, 417, 418. 



signs of activity in, 431. 



special, physiology of, 680. 



specific response of, 411. 



spinal, 682. 



stimulation of, by induction currents, 426, 



Fig. 163. 

 in arm of man, 427, Fig. 164. 



sympathetic, 685. 



trophic, 569. 



vasoconstrictor, 231, 582, 681, 685. 



vasodilator, 233, 234, 449, 681, 685. 

 Nervi erigentes, 393, 688, 693, 694, 700. 

 Nervous system, 31. 



central, 559. 



effect of different poisons on, 574. 



elemental structure of, summary, 561. 



influence of thyroid on, 360. 

 of testes, 357. 



segmentation of, 575. 



sympathetic or autonomic, 686. 

 Network, intracellular, of nerve cells, 560, 

 Fig.. 252. 



pericellular, of Golgi, 561, Fig. 253. 

 Neuro-fibrils, 560, 585. 

 Neuron theory, 559. 

 Neurons, 559. 

 Neuropile, 560, 561. 

 Newborn, period of, 706. 



weight of, 706, 707. 



Nicotin, use of, in tracing ganglionic connec- 

 tions, 582. 



in tracing vagus fibers, 190, 191. 

 Nitric-oxide haemoglobin, 152. 

 Nitrogen, absorption of, by the blood, 335. 

 by plants, 23, 24. 



channels of excretion of, 89, 90. 



determination of, in food and excreta, 83, 84. 



fixed by Bacteria, 24. 



in blood, 335. 



in digestive products of proteid, 295. 



in expired air, 89. 



in faeces, 90. 



in parotid gland, 259. 



in sweat, 89. 



