INDEX 
Tulip, study of flower of, 144-146. 
Tumble-weeds, *193, 194. 
Turnip, seedling, *27 
Twayblade, beetle 
¥172. 
Twigs, study of, 49-51. 
Twiners, *57. 
Types, order of appearance of, 254- 
262. 
on flower of, 
Umbel, App. ,*#267, #268. 
Umbellet, App., 
Underground stems, 58-61*. 
Uneatable plants, 123. 
Union of pistils, 154. 
Union of stamens, 153. 
*267. 
Uredospores, #227. 
Variety, 208. 
Vegetable physiology, 1. 
Vegetation, aquatic, 115. 
Vegetative organs, 24, 2 
Vein, *98, *99, *101. 
Veining, *98, *99, *101. 
Venation, *98, #99, 100, *101, 102. 
Venus’ flytrap, *121. 
Vernation, 92, #93, *94. 
Vertically placed leaves, 110, *111. 
Vessel, 74, 78. 
Volva, 229. 
Water, 
40. 
Water, amount transpired, 134, 155. 
absorption by roots, 39, 
283 
Water, course through leaf, 134. 
Water, excretion of, 133-155. 
Water, movement of, 78-81. 
Water, relation to germination, &. 
Water-lily, white, insertion of floral 
organs, *156. 
Water-lily, white, transitions from 
petals to stamens in, *160. 
Water roots, 31, 32. 
Weapons of plants, 123-125*. 
Wedge-shaped, App., #263. 
Weeds, 200, 201. 
Wheat-grain, section of, #17. 
Wheat rust, study of, 224-228*. 
Wheel-shaped, *152. 
Willow, adventitious buds of, 95. 
Willow, flowers of, 150, #151. 
Wind-pollination, 168, 169. 
Windsor bean seedling, *6. 
Winged fruits, *187. 
Wings, *150. 
Wood of linden, #73. 
Wood sections, *70, *73 
Wood, structure of, #73, 74. 
Wood-cell, #69, *70. 
Work of leaf, 136. 
Xerophy‘es, 114-118*. 
Yarrow, head of, App., #267. 
Yeast, study of, 250, *231, 232-284 
Zoéspores, 215, *218, 
Zygospores, *224. 
