INDEX. 



437 



Impulses, nervous, nature of, 154 



,, ,, dependence on strength 



of stimulus, 137 

 ,, cardiac, how caused, 234 

 ,, ,, modes of recording, 244 



,, afferent and efferent, 850 

 ,, their paths along the 



cord, 1094, 1095, 1106 

 ,, relays in course of, 1096, 



1106 



,, crossing of, 1099 

 sensory, different paths for 



different, 1101 



,, transmitted by grey mat- 



ter and intermediate 

 tracts, 1104 

 ,, ampullar, 1012 

 ,, painful, probable course of, 



1097 



,, motor, effect of afferent im- 

 pulses on the coordination 

 of, 1013, iv. 150 

 ,, visual, 1070, iv. 1, 102 

 ,, auditory, how excited, iv. 176, 



180 



,, ,, development of, iv. 232 



,, volitional, time required for 



transmission, 1063 

 ,, ,, course of, in man along 



the pyramidal tract, 

 1065 



Impurities in expired air, 552 

 Income and output of material in nu- 

 trition, 791 

 Incus, the, iv. 181 

 Indentations of nerve medulla, 117 

 Indol, a product of bacterial action, 428, 



477 



Induction coil, construction of, 62 

 Infancy, characteristics of, iv. 407 

 Inflammation, phenomena of, 336 

 ,, oedema due to, 508 



Infundibulum of mammalian lung, 529, 



530 



Infusoria, ciliary motions in, 165 

 Inhibition of heart-beat in frog, 290 

 ,, ,, ,, in mammal, 296 

 ,, ,, ,, fainting a result 



of, 297, 345 

 ,, ,, effect of atropin 



on, 300 



,, of secretion of saliva, 398 

 of respiration, 591 

 of reflex actions, 915 

 ,, of parturition, iv. 402 

 Inhibitory nerves, 184 



fibres in vagus of frog, 293 

 ,, ,, of mammal, 296 



cardiac, continuous ac- 



tion of, 297 



,, their analogy with vaso- 



dilator fibres, 313 



Inogen, or ' contractile material of mus- 

 cle,' 153 



Insect muscles, fibrillse of, 90 

 Inspiration, mechanism of, 543 

 movements of, 544 



laboured, phenomena of, 



546 



Intercostal muscles, their work in re- 

 spiration, 545 



Interfibrillar substance of muscle, 90, 91 

 Intermediate line, in muscle fibre, 90, 92 

 Intermittence, cardiac, 304 

 Interrupter, magnetic, the, 66 

 Interlobular and intralobular veins and 



veinlets of liver, 706, 712 

 Intestine, general plan of structure, 441 

 ,, absorption of fats in the, 516 

 ,, ,, of diffusable substances 



and water, 520 

 ,, small, mucous membrane of, 



441 

 retiform and adenoid 



tissue, 442 

 glands of Lieberkiihn, 



442, 448 



,, the villi, 445 



,, ,, the columnar epithe- 



lium, 445 

 ,, ,, goblet cells of the villi, 



446 

 ,, ,, structure of the body 



of a villus, 447 



,, ,, glands of Brunner, 450 



,, ,, movements of, 462 



,, ,, changes of food in the, 



473, 474 

 ,, ,, fermentative changes 



of food in the, 478 

 ,, fluidity of food main- 



tained in the, 522 

 ,, large, structure of, 450 

 ,, structure of rectum, 



451 



,, ,, movements of, 462 



,, ,, changes of food in, 478 



,, ,, digestion of cellulose in 



the, 479 



" Intrinsic light " of retina, iv. 97 

 Iodine, coloration of starch by, 360 

 Iris, development of the, iv. 4 

 structure, iv. 24 

 ,, muscular and vascular changes in 



the, iv. 34 



Iron, its presence in hsematin, 568 

 ,, in haemoglobin, 560 



,, in bile, 422, 745 



,, in the spleen, 742 



Irradiation, iv. 126 



Irritability, muscular and nervous, 56 83 

 ,, ,, independent, 57, 145 



,, diminution and disappearance 



of, after death, 83 

 ,, as affected by electro tonus, 128 

 ,, circumstances determining, 143 

 ,, centrifugal loss of, in severed 

 nerve, 144 



