INDEX 



521 



Vertebra}, 222-240. 



cervical, 224, 226, 227. 



dorsal, 224, 225, 226. 



lumbar, 225, 226, 227. 

 Vertebrates, 222, 252, 376, 433: 

 Vestibule of ear, 473. 

 \'^estibular passage, 474, 476. 

 Villi, 120, 134, 135. 

 Viscera, 29. 

 Vision, 452. 



in lower animals, 483. 

 Visual sensation, 452. 

 Vocal cords, 488. 



organs, 486. 

 Vocalizing, 488. 

 Voice, 486-492. 

 Voice, hygiene of, 491. 

 Voluntary action, 412. 



arc, 415. 



muscle, 266. 

 Vomer, 235. 



W. 



Walking, 290, 291. 

 Warm blood, 351. 



Water, absorption of, 141. 



as a nutrient, 56. 



breathers, 341. 



composition, 22, 25. 

 Wax glands, 471. 

 Wind pipe, 315. 

 Wisdom teeth, 96. 

 Worms, 343, 375, 432. 

 Wrinkles, 356. 

 Wrist, 233. 



X. 



Xanthoproteic test, 53. 

 X-ray, 220-221. 



Y. 



Yawning, 332. 



Yellow spot of eye, 465. 



Zoology, 10. 



