PRINCIPLES OF PHYSIOLOGY. 



455 



Intellect, see Understanding. 

 Intestinal canal, how the nerves act on 

 the, 170; often really sensitive, ib. 



Joy, the nature of, 306 ; how far bene- 

 ficial or contranatural, 307 



Judgment, the, may err respecting ex- 

 ternal sensations, 38 ; to what class of 

 conceptions it belongs, 76 



Kidneys, the, have but few nerves, 176 ; 

 susceptible only of extraordinary ex- 

 ternal impressions, 215 ; their secern- 

 ing function, a nerve-action, 477 ; how 

 situate as to nerve-actions from non- 

 conceptional internal impressions, 526 



Kitzel, titillation, or gratification, 80, 

 187, 195-197 



Krijger, his law as to the movements fol- 

 lowing external sensations, 218 



Laughter, the instinct of, 284 



Life, the love of, the fundamental in- 

 stinct in all animals, 280 



Liver, the, its sensibility not great, 175 ; 

 is little susceptible of external sensa- 

 tions, 213; the effects of anger on, 

 325 ; how far capable of nerve -actions, 

 476, 535 



Loathing, 282 



Longing, its sentient and special actions, 

 327 



Love, the enchantment of, 289 ; phy- 

 sical, 302 ; of offspring, 303; the passion 

 of, 306 ; the instinctive emotions of, 

 308 



Lungs, the, little susceptible to ordinary 

 external impressions, 214; congestion 

 of, in the distressing passions, 310; 

 how situate as to nerve-actions, 475, 

 534 



Machines, animal, see Animal machines. 



Machines, mechanical, — meaning of the 

 term, 4, 155-159 ; divided into artistic 

 and organic, 5 ; how put in motion, 

 153, 505, 506 ; actions of the material 

 ideas in, 160-180 ; actions of external 

 sensations in, 181-227; actions of 

 imaginations on, 228-238 ; actions of 

 the sensational foreseeings on, 250- 

 254 ; actions of sensational desires and 

 aversions in, 255-261 ; actions of sen- 

 sational instincts in, 262-304 ; actions 

 of the passions on, 305-329 ; actions 

 of the understanding in, ib. ; actions of 

 intellectual pleasure and pain in, 334- 

 335 ; actions of the will in, 335-344 ; 

 direct actions produced by the vis 

 nervosa in, 444-481 



Material ideas, see Ideas. 



Meditation, the act of, 77 



Membranes, the, are sensitive, 171 ; effect 

 of external impressions on the non 

 muscular, 208 ; the serous, how situate 

 as to external sensations, 208 ; nerve- 

 actions in the muscular, mucous, and 

 fibro-serous, 464, 527 



Memory, an act of the, 71 ; the material 

 ideas induced by sensational, 72 ; to 

 what class of conceptions it belongs, 

 238 



Merkmahlen, elements, 53 



Merkmale, sub-impressions, 68, 73, &c. 



Mind, an act of the, 6 note; 25, 34-36; 

 effect of injury of the medulla of the 

 brain on the, 25 ; material ideas are 

 not the ideas of the, 25 ; determines 

 the point of impression in external 

 sensations, 30 ; can produce voluntarily 

 many kinds of conceptions, 64 ; its 

 inner sense, 80; actions excited by 

 the, 97-111; not necessary to direct 

 nerve-actions in muscles, 449 



Monstrosities, origin of, 636 



Motives, the nature of, 88, 89 ; the im- 

 pressions they add to passive concep- 

 tions, 96 ; as stimuli, 250 ; excite the 

 origin of certain nerves, 251 



Movements, the respiratory, generally 

 neither mechanical nor volitional, 285. 

 See Respiration. 



Movements, voluntary, distinguished into 

 sensational and intellectual, 283 note ; 

 the instinct to perform the sensa- 

 tional, 283 ; instincts for particular 

 kinds of sensational, 284 



Movements, the free-will, with what 

 often confounded, 335 ; how produced 

 and hindered, 336, 342 ; why take 

 place in a given series, 341 ; their im- 

 portant influence in the economy, 

 343; power of the soul not to be 

 limited to, 351 



MiiLLER, J., anticipation of his neurolo- 

 gical views by Albinus, 39 note. 



Muscles, as mechanical machines, 161 ; 

 the nature of the action of the nerves 

 on, 162; their vis insita, 379-388; 

 have each their own special external 

 impressions, 451; reflexion of unfelt 

 external impressions in, 514 



Natural, as applied to mechanical ma- 

 chines, 5 ; conceptions, 27 ; instinct, 

 90 ; subordination of animal functions, 

 666 



Nerve-actions, definition of, 6 ; which 

 may be at the same time sentient 

 actions, 183, 184, 233, 364, 368, 441 ; 

 from the external impression, 358 ; from 

 the internal impression, 359, 360 ; may 



