292 
Union of Cells, 7 
Unisexuales, 255 
Unisexual Plants, 115 
Uredinez, 169 
Uredo, 172 
Uredospores, 172 
Uromyces, 172 
Urticacer, 255 
Ustilagines, 173 
Ustilago, 174 
Usnea, 166 
Usnea, 166 (fig.) 
VACUOLES, 2 
Valerianacer, 259 
Vascular Bundles, 40 
Vaucheria, 186 
Vaucheria, 136 (fig.) 
Vaucheriaces, 185 
Vegetative Cone, 31 
Vegetative Point, 31 
Venation of Dicotyledons, 253 
Venation of Monocotyledons, 241 
Venus’s Fly-trap, 271 
Verbena-blight, 160 
Verbenaceer, 257 
Verbenas, 276 
Vervains, 257 
Vicia, embryo, 252 (fig.) 
Vines, 261 
Vine-rapes, 256 
Violacer, 263 
Violets, 268, 276 
Vochysiacex, 262 
Volvox, 131 
Volvox, 181 (fig.) 
WALKING-LEAF, 203 
Wall of Cell, 4 
Walnuts, 255, 276 
Water-culture Experiments, 85 
Water-flannel, 117 
Water in Cell-walls, 69 
INDEX. 
Water, imbibition of, 2 
Water in Protoplasm, 68 
Water in the Plant, 68 
Water-lilies, 268, 276 
Water-lily, tissue, 57 (fig.) 
Water-mould, 138 (fig.) 
Water-moulds, 136 
Water-net, 117 
Water-plantains, 248 
Wheat, 249 
Wheat-rust 169 
Wheat-smut, 175 
White Pine, 224 
White Rust, 142 (fig.) 
White Rusts, 139 
Wild Cucumber, epidermis, 38 
(fig.) 
Willow-blight, 160 
Willows, 254, 276 
Wind-pollinated Flowers, 234 
Windsor Bean, 251 
Witch-hazels, 260 
Wood, 18 
Woody Bundles, 40 
Xytiem, 45 
Xyridacese, 244 
Yams, 244 
Yeast-plants, 108. 110 
Yeast plants, 8, 111 (figs.) 
Yellow-eyed Grasses, 244 
Yellow Pine, 224 
ZoOsPoRB, 116 
Zodsporee, 116, 131 
Zygnema, 128 
Zygnemacer, 122 
Zygophyllacese, 261 
Zygophyta, 115 
Zygophytes, 115 
Zygospore, 115 
