INDEX. 



743 



Vocal cords, 486 



Vocalization, mechanism of, 488 



Voice, 486 



nervous mechanism of, 493 

 properties of the human, 491 



Volition, 626 



Vomiting, 123 



Vorticella, 43, 95 



ciliary motion of, 95 

 contractile stalk of, 96 



WALKING and running, 481 

 Warm blooded animals, 428 

 Water, 80 

 Wharton's duct, 127 



White substance of Schwann, 498 

 Wolffian bodies, 687 



VANTHIN in urine, 403 



A 



YAWNING, 350 



1 Yeast plant, 91 

 Yelk sack, the, 652 

 Yellow elastic tissue, 56 

 Yellow spot, 578 



structure of, 683 



ZONA pellucida, 652 

 Zymogen, 168 



