412 
Vegetation, tropical, 324, 325. 
Vegetative organs, 30. 
Vein, 130, *133, *136. 
Veining, *133, *136. 
Venation, *133, 134, 135, *136. 
Venus flytrap, *843, 344. 
Vernation, 125, *126, 127. 
Vertically placed leaves, 146, *147, 
148. 
Vessel, *92, 106. 
Volva, *265. 
Water, absorption by roots, 53-55. 
Water, amount transpired, 159- 
165. 
Water, course through leaf, 165, 
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, *151. 
Weeds, 387-390. 
Weeds, study of, 388, 389. 
Wheat-grain, section of, *19. 
FOUNDATIONS OF BOTANY 
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. 
