PRINCIPLES OF PHYSIOLOGY. 



459 



Vis nervosa (continued) 



excited by non-conceptional internal 

 impressions, 381, ii ; no animal motor 

 force independent of, 389 ; machines 

 not endowed with nerves not adapted 

 to, 390 ; of the heart, 392 ; of the 

 oesophagus, stomach, &c., 393 ; of the 

 glandular tissues, 394 ; of the sexual 

 organs, 395 ; in the movements of the 

 limbs, 396; either kind of, may be 

 excited without the conceptive force, 

 398 ; of external imprjessions, 409- 

 413 ; of non-conceptional internal im- 

 pressions, 482-540; all the sentient 

 actions of imaginations and fore-see- 

 ings, sensational conceptions, desires, 

 and aversions, instincts, and emo- 

 tions, imitated by, 545-553 ; effect of 

 opium on, 558 ; how far the passions 

 may be imitated by, 562-573 ; intel- 

 lectual conceptions and motives can- 

 not be induced by, 575, 576; how 

 far the influence of the will can 

 be induced by, 577 ; as possessed 

 by sentient and insentient animals, 

 604-617; causes movements, neces- 

 sary to the preservation of animals, 

 610 ; of a reasoning animal, 618, 626 ; 

 a large class of animals endowed alone 

 with, 621-624 ; of a purely sensational 

 animal, 626; abolition of, 709, 710 



Vital spirits, the, how secreted, 11, 362, 

 416; their existence probable, 15, i; 



Vital spirits (continued) 



course of the impressions propagated 

 by, 17, 18; how weakened, 20; func- 

 tions of the sentient forces dependent 

 upon, 21 ; the movements of the nerves 

 probably only movements of, 145; 

 effect of an irregular influence of, 314. 



Vorstellung, generally translated by "con- 

 ception," 5 note, 25 note. 



Forstellungskraft, conceptive force, sen- 

 tient force, or mind, 6 



War-instinct, the, its nature, 301, 326; 

 its sentient actions may be nerve-ac- 

 tions, 559 



Whytt, his renewal of an erroneous pro- 

 position of the ancients, 404 



Will, the free, 96 ; sentient actions of its 

 desires and aversions, 335 ; conflict 

 between the sensational faculty and, 

 337 ; satisfaction of, prevented, 338 ; 

 the flesh has always a part in, 339 ; 

 how far its incidental influence may be 

 exercised by the vis nervosa, 577 ; how 

 far its desires and aversions may be 

 induced by vis nervosa, 378 ; move- 

 ments of, see Movements. 



Wille and WillMhr, how used, 283 note. 



Willkiihrlich, how rendered, 283 note, 

 335 note. 



Yawning, its nature, 287, ii. 



