526 



EST)EX. 



Urine, variations of, at different 

 seasons, and at different periods 

 of the day, 222 



variations of, with food, 223 



influence of muscular exer- 

 cise upon the composition of,. . 226 



influence of mental exertion 



upon the composition of, 229 



Urrosacine, urochrome, urohaema- 

 tioe, uroxanthine, 217 



Uvula, action of, in phonation, . . . 608 



Velum palati, action of, in phona- 

 tion, 508 



Tenoms, non-absorption of, by 



mucous membranes, 67 



Verheyen, stars of, 159 



Vernix caseosa, 67 



composition of, 67 



microscopical characters of, . 68 



function of, 68 



Vocal chords, 492 



appearance of, during phona- 

 tion, 499 



Vocal organs, physiological anato- 

 my of, 491 



Voice, 490 



mechanism of the produc- 

 tion of, 497 



characters of, in childhood,. 502 



range of, 503, 504 



different kinds of, 504 



action of the intrinsic mus- 

 cles of the laryux in, 505 



action of the accessory or- 

 gans in, ." 507 



action of the trachea in, . . . 507 



action of the epiglottis in, . . 507 



action of the velum palati in, 508 



action of the uvula in, 508 



action of the tongue in,. ... 508 



mechanism of the different 



registers of, 509 



Vowels, 514 



Woorara, influence of, upon the 

 motor nerves, 464 



Xanthine, in the urine, 209 



