INDEX. 



1575 



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, 1288 

 visual, 1070, 1139, 1240 

 ,, auditory, how excited, 1314, 



1318 



,, development of, 1370 



,, volitional, time required for 



transmission, 1063 

 ,, ,, course of, in man along 



the pyramidal tract, 

 1065 



Impurities in expired air, 552 

 Incus, the, 1319 



Income and output of material in nu- 

 trition, 791 



Indentations of nerve medulla, 117 

 Indol, a product of bacterial action, 428, 



477 



Induction coil, construction of, 62 

 Infancy, characteristics of, 1545 

 Inflammation, phenomena of, 336 

 ,, osdema 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, 1540 



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 



Inogeu, or 'contractile material of mus- 

 cle,' 153 



Insect muscles, fibrillae of, 90 

 Inspiration, mechanism of, 543 

 ,, movements of, 544 



,, laboured, phenomena of, 



546 



Intercostal muscles, their work in re- 

 spiration, 545 



Interfibi illar 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 diffusible substances 



and water, 520 

 ,, small, mucous membrane of, 



441 

 ,, ,, retiform and adenoid 



tissue, 442 

 ,, glands of Lieberkiihn, 



442, 448 



the vim, 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, 1235 

 Iodine, coloration of starch by, 360 

 Iris, development of the, 1142 

 ,, structure, 1162 

 ,, muscular and vascular changes in 



the, 1172 



Iron, its presence in hsematin, 568 

 ,, ,, in haemoglobin, 560 



in bile, 422, 745 



,, ,, in the spleen, 742 



Irradiation, 1264 



Irritability, muscular and nervous, 56-83 

 ,, ,, independent, 57, 145 



,, diminution and disappearance 



of, after death, 83 

 ,, as affected by electrotonus, 128 

 ,, circumstances determining, 143 

 ,, centrifugal loss of, in severed 

 nerve, 144 



