412 



FOUNDATIONS OF BOTANY 



Vegetation, tropical, 324, 325. 

 Vegetative organs, 30. 

 Vein, 130, *133, *136. 

 Veining, »133, »136. 

 Venation, *133, 134, 135, *136. 

 Venus flytrap, *343, 344. 

 Vernation, 125, *126, 127. 

 Vertically placed leaves, 146, *147, 



148. 

 Vessel, *92, 106. 

 Volva, •266. 



Water, absorption by roots, 53-55. 

 Water, amount transpired, 159- 



165. 

 Water, course through leaf, 163, 



164. 

 Water, excretion of, 172, 173. 

 Water, movement of, 107, *108, 



*109, *110, 111, 112, 113. 

 Water, relation to germination, 10. 

 Water-lily, white, insertion of 



floral organs, *205. 

 Water-lily, white, transitions from 



petals to stamens in, *209. 

 Water roots, 37. 

 Weapons of plants, 349-351*. 

 Wedge-shaped, *131. 

 Weeds, 387-390. 

 Weeds, study of, 388, 389. 

 Wheat-grain, section of, *19. 



Wheat rust, study of, 259-262*. 



Wheel-shaped, *202. 



Whorled, *293, 294. 



Willow, adventitious buds of, 128. 



Willow, arctic, *328. 



Willow, flowers of, *201. 



Wilting, 111. 



Wind-pollination, 354. 



Windsor bean sprouting over mer- 

 cury, 56, «57. 



Winged fruits, 377, *378. 



Wings, *199. 



Wood, coniferous, structure of, 92, 

 *93, *94. 



Wood of linden, *100. 



Wood sections, *100, *101, *102. 



Wood, structure of, *93, *100, 

 *101. 



Wood-cell, *89, *91, •101. 



Wood-parenchyma, 94. 



Xanthoria, *271. 

 Xerophytes, 311, 313-317*. 



Yarrow, head of, *189. 

 Yeast, study of, 266-270, *268. 

 Yucca, 335. 



Zones, vegetation of, 324-328. 

 Zoospores, 236, *244. 

 Zygospores, 236, *243, *259. 



