INDEX 



1315 



Tryptophane, 84 



metabolism of, 815 

 Twilight vision, 547, 583 

 Twitch, muscle-, 194-201 



methods of recording, 



194-198 



Tympanum, functions of, 604 

 Tyrosin, 50, 83 



action of bacteria on, 76 

 metabolism of, 814 



URACIL, 101 

 Urates, 1168 

 Urea, estimation of, 1176 

 origin of, 802 

 production from arginine, 810 



from creatine, 83 

 in urine, 1165 

 Uric acid, 100, 819 



excretion of, 822 

 formation in birds, 804 

 origin of, 821 

 in urine, 1167 

 Urinary deposits, 1174 

 Urine, abnormal constituents of, 1171 

 in blood plasma, 1181 

 composition of, 1160-1180 

 inorganic constituents of, 1162 

 phosphates in, 1163 

 pigments of, 1170 

 organic constituents of, 1155 

 quantitative estimation of chief con- 

 stituents of, 1175-1180 

 salts in, 1165 

 secretion of, 1181-1204 

 sugar in, 843, 1172 

 Urobilin, 871 

 Uterus, changes during birth, 1287 



during menstruation, 1275 

 Utricule, 397 



VAGUS, ACTION ON HEABT, 1013 

 on intestines, 775 

 on oesophagus, 726 

 on respiration, 1139 

 on stomach, 746 

 functions of, 473 

 respiratory fibres of, 413 

 Valves of heart, 938 



of Vieiissens, 370 



Vaso-dilatation in salivary glands, 712 

 Vaso-dilator nerves, 1039 

 Vaso-motor impulses, path in cord, 359 

 nerves, 469 



course of, 1033 

 reflexes, 1043 

 system, 1025-1050 

 Veias, blood flow in, 976 



pulse in, 977 

 Ventricles. See Heart. 



pressure in, 940 



Veratrin, action on muscles, 211 

 Vertigo, 656 

 Vesicular murmur, 1094 



Vestibular nerve, 379, 412 



functions of, 396 

 Vestibulo-spinal tract, 353, 389 

 Viscera, sensibility of, 476 

 Visceral nervous system, 465-477 



afferent functions 



of, 476 



Vision, physiology of, 486-594 

 binocular, 588-594 

 colour threshold for, 557 

 cortical localisation of, 447 

 different thresholds for, 561 



types of, 502 

 field of, 549 



intensity threshold, 555 

 mechanism of, 490 

 monocular, 590 

 paths in brain, 386, 405 

 peripheral, 551 



colour-, 581 

 psychic cortex, 430 

 sensation curve of, 566 

 sensory cortex, 430 

 size threshold for, 558 

 stereoscopic, 591 



subjective phenomena of, 566-576 

 theories of colour-, 583 

 Visual acuity, 558 



determination of, 535 

 colour threshold for, 561 

 field, 549 



impulses, path of, 406 

 impressions, 447 

 persistence, 568 

 purple, 545, 583 

 Vital force, 8 

 Vitalism, 8 . 

 Vitamines, 693 

 Vocal cords, 620 

 Voice, mechanism of, 618 

 production of, 621 

 Volition, 451 

 Voluntary contraction, 239-242 



electrical changes in, 



241 

 movement, effect of hemisection 



of cord on, 359 

 muscle. See Muscle. 

 Vomiting, 746 

 Vowel sounds, 624 



WALLERIAN METHOD, 320 

 Waller's theory of hearing, 613 

 Water, association to life, 6 

 Weber's law, 483 



for touch, 631 . 

 Work of heart, 959 



during exercise, 1054 

 of isolated muscle, 202 



XANTHINE, 100 

 Xylose, 61 



YOUNG'S THEOBY OF COLOUR VISION, 583 



