ON THE NERVOUS SYSTEM. 



463 



Secretion, influence of the nerves in, 418 ; 

 Musgrave's doctrines on, 419 



Sensorium commune, its functions and 

 seat, 429—432 ; centre of motor and 

 sensorial nerves, 429 ; its law of 

 action, consensus of nerves in, 433 — 

 435 ; its function is the reflexion of 

 external sensory impressions of the 

 nerves upon the motor, 429, 430, 431. 



Soul, the rational, seat of, according to 

 Aristotle, 365 ; the rational and 

 corporeal, according to Willis, 376 ; 

 its union with the body, 439 ; all we 

 know of the, 449 



Spallanzani, his remarks on animal- 

 cules, 386 



Spirits, three acknowledged by Galen 

 and others, 366 ; the animal, their 

 origin and seat, according to Galen, 

 367, 368 ; Des Cartes' opinion on 

 the secretion of, 370 ; dislodged from 

 the ventricles of the brain, 370, 371 ; 

 said by Malpighi, &c., to be secreted 

 by the cortical substance of the brain, 

 374; their existence denied, 378 



Stahlians, opponents of the animal 

 spirits, 379 ; their error as to the soul, 

 449 



Tarin quoted, 378 



Tendons, morbid sensibility of, 394 



Testes, see Tubercula Quadrigemina. 



Thought, cannot depend solely on the 

 mind, 442; organs of the faculty of, 

 446 ; its acknowledged depijdence 

 upon the body, 445 



TissoT, supports the doctrine of animal 

 spirits, 379; his views as to the ne- 

 cessity of nerves to nutrition, 424 ; 

 lays stress on "Whytt's arguments on 

 the consensus of the nerves, 434 ; 

 his opinion on the functions of the 

 ganglia, 378, 435 



Tralles quoted, 396 ; his opinion on 

 the union of soul and body, 445 



Tubercula quadrigemina, their use ac- 

 cording to Galen and Willis, 368, 

 376 



Understanding, one of the animal func- 

 tions, 439 



Unzer, J. A, value of his doctrines as to 

 vis nervosa, 380 ; on the reflexion of 

 impressions in the ganglia, 438 



Ventricles of the brain, the use of the 

 anterior or superior, according to 



Ventricles of the brain {continued) 

 Galen, 367; the animal functions 

 distributed amongst the, by the Arabs, 

 369 ; the animal spirits dislodged from 

 the, 370, 371 ; shown not to be cloacae, 

 372—374 



Verschuir, his experiments on arteries, 

 412; his theory of the flow of the 

 menses, 415 



Vesalius, a follower of Plato, 366; 

 indifi'erent as to the course of the 

 animal spirits, 369 



ViEussENs, where the seat of imagina- 

 tion placed by, 377 ; first taught the 

 function of the ganglia, 378 ; where 

 placed the sensorium commune, 429; 

 his opinion on the consensus of the 

 nerves, 433 



Vis nervosa, in what sense the term is 

 used, 380 ; the cause of the functions 

 of the nervous system, 380; a stimulus 

 necessary to its action, 389 ; is not 

 indifferent to the kind of stimulus, 

 391 ; how increased, 391 — 395 ; in- 

 creased locally, 392 ; when diminished, 

 395 — 397; action of opium on, 396; 

 is divisible and exists in the nerves 

 independently of the brain, 397 — 402 ; 

 is the cause of the heart's movements, 

 399; its action modified in idiosyn- 

 crasies, 402; is a substitute for the 

 mind, 446 



Vital principle, compounded of various 

 forces, 427 ; may exist independently 

 of vis nervosa in plants and certain 

 animals, 428 



Whytt, his arguments on the consensus 

 of the nerves, 377, 435 ; his experi- 

 ments on the nerves, 396 ; his doc- 

 trines on consensus of the nerves, 435 



Will, definition of the, 440 



Willis, his opinion on the functions 

 of the brain, 373, 375 ; and on the 

 animal spirits, 375 ; his opinion on 

 the consensus of the nerves, 433 



WiNSLow, his doctrine that the ganglia 

 are little brains, 378 



WiNTERL, his conjecture on the nature 

 of the action of nerves on the vessels, 

 410 



WiRTENSON, his dissertation on opium, 

 396 



ZiNN quoted, 378 



Zoophytes, how feel and move without a 

 nervous system, 387. 



THE END. 



