INDEX 



445 



Ventricle, 352. 



Venus's flower basket, 193. 



Venus's flytrap, 139. 



Vermiform appendix, 342. 



Vernation, 105. 



Vertebra, structure of, in man, 372, 



373. 

 Vertebral column, adaptations in, 372. 

 Villus (plu. villi), function of, 341; 



structure of, 341. 

 Vocal cords, 426. 

 Voice, how produced, 426; 



pitch and range of, 427. 

 Volvox, colony of, 187. 



Waders, 304. 

 Walking, 365. 

 Walking stick, 231. 

 Warning coloration, 234. 

 Wasp, digger, 249; 



solitary, 249, 250. 

 Wasp nest, 251. 

 Wastes, in human body, 393. 

 Water, amount lost through kidney, 

 393; 



amount lost through lungs, 384 ; 



effect on dry seeds, 78; 



impure, 325; 



in germination, 78; 



in living thiii|;s, 19. 



Water supply, ofToot of, on plan Us, 11 .i. 



Wax, in tlio ear, 422. 



Wheat, production of, 63. 



Winding stair, use of, 2r)7. 



Wings, 36. 



Wood, ccorioniic vahic <>(, 117; 



method of cutting, 115; 



structure of, 114. 

 Work, daily, of heart, 3r)3; 



effect of alcohol on muscular, 307; 



muscular, 36.'). 

 Worms, cliivssi 11 cation of, 214; 



flat, 212 ; 



sand, 211; 



round, 214; 



segmented, 211; 



tape, 213; 



unscgmented, 212. 



Xerophytes, 144. 



Yeast, spore formation in, 167; 

 growth of, 166; 

 economic value of, 166. 



Zoology, defined, 11. 

 Zoospores, formation of, 177. 

 Zygospore, in Spirogyra, 176; 

 in mold, 161. 



^- t. State ColUg 



