INDEX. 



1183 



vibration of the, 1074, 1085 ; tightening 

 and slackening of the, 1081 



Voice, the, 1070-1091; how produced, 

 1071; fundamental features of the, 

 1074; different qualities of, 1085; chest 

 and head voices, 1088 ; registers of the, 

 1090; breaking of the, 1091 



Volkmann, his haemadromometer, 172 



Voluntary movements, their tetanic char- 

 acter, 122; nervous mechanisms for, 

 739, 777 



Vomiting, mechanism of, 378 



Vowel chamber, 1092 



Vowels, how formed, 1093 



Walking, how effected, 1102 



Walls, vascular, their influence on tran- 

 sudation, 407 



Warmth, its effect on skin action, 541 



Waste matters, their discharge from the 

 living body, 2 ; given out by amoebae, 4; 

 not necessarily useless, 40, 41 ; nitroge- 

 nous, 93; not increased by muscle con- 

 traction, 94, 97, 636 ; elimination of, 513 



Water, secretion of, by the glands, 351 ; 

 varying amount of, in living tissue, 

 409 ; its absorption into the portal sys- 

 tem, 414; intestinal secretion of, 422; 

 its discharge by the kidney, 541 ; by 

 the skin, 555 



Wave-pulse, dicrotic, origin of, 232-236 ; 

 predicrotic, 235 ; anacrotic, 236 



Waves of contraction, muscular, 83; of 

 nerve and muscle impulse, 109; of 

 sound, 987, 999; of light, 891 



Web of frog, arterial changes visible in, 

 262 



Weber's law, 880, 1001, 1038 



Weight, human, curve of, 1145 



Whispering, how effected, 1095, 1100 



White, sensations of, produced from mix- 

 ing of colour sensations, 897 



Willis, circle of, 827 



Winking, how effected, 976; chief use, 

 978, 979 



" Word-deafness," 797 



Work, mechanical, in living body, 2; 

 done by a muscle-nerve preparation, 

 119 et supra ; amount of, done by the 

 heart, 217 ; daily, estimate of, 634 ; me- 

 chanical source of energy of, 636 ; pro- 

 duction of heat increased by, 644 



Xanthin, a constituent of urine, 517, 



597 ; present in the thymus, 602 

 Xanthoproteic test for protein, 17, 18 



Yawning, 511 



Yellow spot, colour sensations as affected 

 by, 913 



Young-Helmholtz, theory of primary 

 colour sensations, 898; as applied to 

 colour blindness, 908, 911 ; of simulta- 

 neous and successive contrasts, 935 



Zinn zonule, passage of fluid by the, 



975 

 Zone, peripheral of capillaries, 290 ; Lds- 



sauer's, 685, 686 

 Zymogens, 350, 352. 



