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 stellatas 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 

 Vesiculas seminales, 1508 



,, ,, secretion of, 1508 

 ,, ,, theiractioninemission,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 hfematachometer, 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 



