INDEX. 



639 



Inorganic elements in human body, 25 

 Insects, temperature of, 193 

 Inspiration, 162 



elastic resistance overcome by, 



170 



force employed in, 169 

 during apnoea, 170 

 influence of on circulation, 146 

 mechanism of, 162 



Instability of organic compounds, 19 

 Intellectual faculties, relation to cer- 

 ebrum, 420 



Interarticular fibro-cartilage, 45 

 Intercellular substance, 32 

 Intercostal muscles, action in inspira- 

 tion, 162 



in expiration, 165 

 Interlobular veins, 254 

 Intestinal canal, development of, 585, 



605 



Intestines, digestion in, 238 

 fatty discharges from, 252 

 gases in, 274 

 large, digestion in. 272 

 glands of, 249 

 structure of, 248 

 movements of, 275 

 small, changes of food in, 270 

 glands of, 240 

 structure of, 238 

 valvulae conniventes of, 240 

 villi of, 246 

 Intonation, 488 

 Intralobular veins, 254 

 Inversion of images on retina, 512 



correction of, 513 

 Involuntary movements originated by 



will, 413 

 muscles, action of, 473 



structure of, 456 

 Iris ; 506 



action of, 426, 509 



in adaptation to distances, 



511 



capillaries'of, 134 

 development of, 605 

 influence of fifth nerve on, 430 

 of sixth nerve, 427 

 of third nerve, 426, note. 

 relation of to optic nerve, 425 

 structure and function of, 507 

 Iron in parts of body in which found, 



26 



Irritability of muscular tissue, 461 

 Iter a tertio ad quartum ventriculum, 



419 

 Ivory of teeth, 51 



Jacob's membrane, 502 

 Jacobson's nerve, 435 



Jejunum, 239 



Jetting flow of blood in arteries, 118 



Jumping. 472 



Keratin, 24 



Kidney, increased function of one, 



324 

 Kidneys, their structure, 349 



bloodvessels of, how distributed, 



352 



capillaries of, 135, 353 

 development of, 609 

 function of, 354. See Urine. 

 Malpighian bodies of, 352 

 tubules of. 350 



Knee, pain of, in diseased hip, 384, 

 395 



Labia externa and interna, 563 

 Labyrinth of the ear. 529 



membranous, 532 



osseous, 529 



function of, 541 

 Lacteals, 279 



absorption by, 290 



contain lymph in fasting, 288 



origin of, 280 



structure of, 282 



in villi, 248, 291 

 Lactic acid in blood, 76 



in gastric fluid, 222 

 Lactiferous ducts, 613 

 Lacunae of bone, 48 

 Lamellae of bone, 48, 49 

 Lamina spiralis, 532 



use of, 542 

 Laminae dorsales, 582, 595 



viscerales or ventrales, 582, 595 

 Language, how produced, 486 

 Large intestine. See Intestine. 

 Laryngeal nerves, 438 

 Larynx, construction of, 476 



influence of pneutnogastric nerve 

 on, 439-441 



irritation referred to, 384 



muscles of, 479 



variations in according to sex and 

 age, 484 



ventricles of, 486 



vocal cords of, 476, 479 

 Laws of functions of nerves, 382 

 Laxator tympani muscle, 529 

 Lead an accidental element, 26 

 Leaping, 472 



Legumen identical with casein, 203 

 Lens, crystalline, 506 

 Lenticular ganglion, relation of third 



nerve to, 425 

 Lenticular glands of stomach, 219 



