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 

 ,, 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, 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 



Inogen, 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 



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 diffusible substances 



and water, 520 

 ,, small, mucous membrane of, 



441 

 ,, ,, retiform and adenoid 



tissue, 442 

 glands of LieberkUhn, 



442, 448 

 the villi, 445 



,, ,, the columnar epithe- 



lium, 445 

 goblet ceUs of the viUi, 



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 haematin, 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 electro tonus, 128 

 ,, circumstances determining, 143 

 centrifugal loss of, in severed 

 nerve, 144 



