INDEX TO VOLUME II 



521 



Vasa-deferentia, 443 



efferentia of the testis, 447 

 Vaso-niotor nerves of the cranial vessels, 286 

 Ventral nerve-roots, number of fibres of, 230 

 Ventricles of Morgagni, 422 



of the brain, capacity of, 274 

 Ventricular bands, 422 



Veratria, action of, on coagulation of muscle- 

 plasma, 164 

 on muscular contraction, 129, 137 

 on nerves and muscles, 60 

 effect of, on muscular contraction, 128 

 Vertigo in diseases of the ear labyrinth, 406 

 Vestibular root of the auditory nerve, central 



path of, 237 

 Vestibule of the bony labyrinth, 371 

 Vibrations of the tympanic membrane, 370 



transmission of, through the labyrinth, 376 

 Vision, binocular, 356 

 far-point of, 312 

 indirect, 341 

 near-point of, 312 

 pseudoscopic, 357 

 stereoscopic, 357 

 Visual area of the cortex, 253 



impulses, place of origin of, in the retina, 



327 

 judgments of distance, 348 

 of size, 350 



and distance, 354 

 purple, 330 



adaptation of the eye by, 326 

 sensation, intensity of, 339 

 Vitelline membrane, absence of, in human ova, 



450 

 Vitreous humor, opacities in, 321 



refractive index of, 303 

 Vocal cords, false, 422 



true, 423 

 Voice, 430 



changes at puberty in, 489 

 effect of age on, 431 

 pitch of, 432 

 registers of, 432 

 Voice-production, 421 



mechanism of, 431 

 Voices, classification of, 433 

 Volta, 28 

 Voltaic pile, 28 



Voluntary muscular contractions, fatigue of, 134 

 tetanic character of, 133 

 reactions, afferent paths of, 226 

 anatomical mechanism of, 226 

 compared with reflex, 225 

 von Gudden's commissure, 238 

 Vorticella. movements of, 20 

 Vowel-sounds, 131 

 differences in quality of, 385 

 production of. 434 

 Vulva, 443, 462 



Walking, 420 



Wallerian degeneration, changes of excitability 

 in, 69 

 of nerve-fibres, 197 

 of nerves, 69 

 Water, percentage of, in brain and cord, 274 

 pure, toxic action of, on nerves and muscles, 

 58 

 Weber's law, 340 



applied to pressure-sensations, 393 

 Weight, increase of, in the embryo, 487 

 of the brain and spinal cord, 274 

 decrease of, in old age, 296 

 relation of, to social environment, 277 

 of the child at birth. 487 

 Weissmann's theory of heredity, 502 

 Whispering, 436 



Whistling register of the voice, 433 

 White matter of the central nervous system, 



water contents of, 274 

 Womb, 443, 456 



Work done by contracting muscles, condition^ 

 affecting, L39 

 by muscular contraction, curve of, 140 

 Worms, segmental nervous system of, 212 

 Wrisberg, cartilages of, 422, 425 

 Wundt's closing tetanus, 37, 61, 131 



Xantiiix of muscles, 167 



Young-Helmholtz theory of color vision, :;:;" 



Zollner's lines. :;r.i 

 Zona pellucida, 4~>4 

 of the ovum, 450 

 radiata of the ovum, 449, 450 



