1594 



INDEX. 



Vaso-motor centre, relations of to other 



centres, 327 

 fibres, constrictor, 310, 312 



course of, 317, 322, 



330 

 loss of medulla in, 



317 

 ,, ,, ,, tonic action of, 319- 



323 



chief parts of body 



supplied by, 322 

 dilator, 312 



,, ,, ,, course of, 318 



usually employed as 



part of reflex ac- 

 tion, 321 



,, ,, ,, retention of me- 



dulla in, 331 

 ,, functions of the central nervous 



system, 321 

 ,, nerves of veins, 333 

 Vegetable cell, storage of metabolic pro- 

 ducts in, 828 

 diet, results of, 839 

 ,, ,, large amount required, 841 

 Veins, structure of, 196 

 ,, minute, 197 

 valves of, 197, 219 

 their capacity as compared with 



arteries, 200 



blood-pressure in, 203, 207 

 ,, vaso-motor nerves of, 333 

 Velocity of nervous impulse, 75 

 ,, of muscular contraction, 87 

 , , equal , of muscular current of action 



and nervous impulse, 124 

 , , comparative, of arterial, venous and 



capillary circulation, 209-220 

 ,, of blood-current, 263 

 ,, of pulse wave, 264 

 Venae stellatae of kidney, 645 

 Venous circulation, aids to, 219 

 pulse, 271, 613 

 ,, sinuses of brain, 1133 

 Ventilation, positive and negative of lung, 



594 

 Ventricle of heart of frog, action in 



heart-beat, 282 



,, ,, of tortoise, isolated, 

 spontaneous beat of, 

 285 

 Ventricles of heart, synchronism of their 



action, 229 

 ,, ,, ,, change of form of in 



cardiac cycle, 232 

 ,, ,, ,, four stages of action of , 



246 



,, ,, ,, toniccontractionof,304 



of brain, development of, 930 



Vermiform appendix, solitary follicles in 



the, 489 



Vertigo, causes of, 1015 



Vesicles, cerebral, 929 



optic, 1140 



Vesicles, otic, 1315 

 Vesiculze seminales, 1508 



,, ,, secretion of, 1508 

 ,, theiraction in emission, 1510 

 Vestibule of ear, 1317 



parts of, 1336 



,, ,, perilymph cavity of, 1338 



Vibrations of muscle sound, 140 



,, sonorous, longitudinal and trans- 

 versal, 1328 

 ,, of the tympanic membrane, 



1329 

 ,, ,, through the auditory ossicles, 



1330 

 ,, ,, through the bones of the skull, 



1331 



of sound and light compared, 1363, 

 interference of, 1367 

 Vierordt, his haematachometer, 222 

 Vieussens, annulus of, 299 

 Villi, the, of small intestine, 445 



,, columnar epithelium of, 445, 516 

 goblet cells of, 446 

 ,, structure of, 447 

 ,, pumping action of, 519 

 ,, of chorion, foetal, 1515 

 Vision, 1070 



binocular, 1071, 1272-1292 



,, ,, its action in judging of distance, 



1289 



of solidity, 1300 



,, ,, mechanism of, 1071 

 ,, central apparatus for, 1077 

 imperfections of, 1078 

 ,, affected by injury to cortex, 1081 

 ,, dioptric mechanisms of, 1139, 1144 

 ,, astigmatism, 1186 

 spherical aberration, 1186 

 ,, chromatic aberration, 1188 

 ,, entoptic phenomena, 1189 

 distinct, limits of, 1218 

 ,, trichromic nature of, 1229, 1236 

 ,, colour, Young-Helmholtz' theory 



of, 1229, 1267 



Bering's theory of, 1231, 1267 

 field of, 1071, 1261,' 1273 

 corresponding or identical points, 



1275 

 struggle of the two fields of, 1293, 



1302 



Visual areas in fovea centralis, 1219 

 axis, 1272 



centres, lower and higher, 1084 

 ,, impulses, development of, 1248 



origin of, 1252 

 ,, perceptions and judgments, 1293- 



1302 



,, psychical processes in, 1296 



,, plane, 1273 

 purple, 1254 

 ,, sensations, 1070-1085 

 ,, ,, probable mode of development 



of, 1083 

 fusion of, 1214, 1218 



