INDEX 



401 



Ventilation, 369, 371. 



Venus Fly-trap, 76, 77, 246. 



Vernation, 137. 



Viability, 3S0 ; tests, 386. 



Violet, seed pods, 364. 



Vitalistic conception of nature, 39, 40. 



Vitality, suspension, 377. 



Warming, 288. 



Water, capillary, in soils, 239 ; 

 flotage by, 360 ; hydrostatic, 238 : 

 hygroscopic iUms, 239 ; in seeds, 

 377 ; in soils, 238 ; uses in plants, 

 224. 



Water culture, 243 ; described, 242. 



Water Lily seed, 361. 



Water plants, 9, 61, 251; roots, 

 252. 



Wax, 111. 



Weeping Birch, 182. 



Welwit^chia, 71. 



Whorl, 140. 



Wiesner, 291. 



Wild Geranium, 334. 



Wilting, 48. 



Wilts, 367. 



Wind, effects on trees, 183 ; pol- 

 linated flowers, characteristics, 288 ; 

 pollination, 288 ; waftage, 358. 



Windburn, 48, 97, 259. 



Wing, 358 ; on fruits, 350, 351. 



n'inter-killing, 259. 



Witches' brooms, 198, 199. 



Wood, 130 ; fibers, 265 ; grain, 124 ; 

 parenchyma, 130. 



Wooden Flower, 200. 



Xanthophyll, 89, 90, 91 ; composi- 

 tion, 108. 

 Xenia, 353. 

 Xerophyte, 190. 

 Xylem, 122, 130, 222, 262. 



Yeast, 169. 



Yucca, pollination, 293. 



Zoospores, 301, 357. 

 Zymase, 110. 



Printed in the United States of America. 



