INDEX 



455 



thodes, 147 ; control of, 92, 

 95, 100, 137; cuticular — , 93, 

 161; of Alpines, 170; of bog- 

 plants, 177 ; of rolled leaves, 

 163; of shade-leaves, 170; of 

 succulents, 167 ; of woodland 

 plants, 178 ; reduction of, 

 58, 64, 93, 95, loi, 106, 158- 

 65 (figs.), 342, 343, 344. 



Tree Ferns, 289, 294. 



Triarch roots, 69. 



TropcBolinn, 63, 115. 



Tropical plants, 73, 75, 103, 125, 

 153. 157, -04. 289, 294, 296, 

 309, 372. 



Truffle (Tuber). 240, 241, 255. 



Tube-cell of, Angiosperms, 363. 367 

 (fig.) ; Conifers, 349, 351 (fig.) ; 

 Cycads, 327 (fig.). 



Tubers, 40, 43, 44, 50, 88 ; of 

 Eqiiisetum, 311. 



Tulip [Tulipa), pollen and stamen 



of, 359 (fig.). 364, 367 (fig.). 



Turgescence, 9, 10, 87, 98, 100, 149, 

 152, 198 ; and sleep - move- 

 ments, 115, 116. 



Turmeric, 64. 



Turnip, " Finger and Toe " disease 

 of (Plasmodiophora), 254. 



Turpentine, 63, 334. 



Twaj'blade (Listera ovata), embryo 

 of, 371 (fig.). 



Tyloses, 126, 127 (fig.), 142. 



Tyndall, 64. 



Typha, 361. 



Tyrosin, 52. 



Ulex europaius, 167 ; epidermis of, 

 92, 160 (fig.). 



XJhnus, 130, 139, 141, 365 ; second- 

 ary wood of, 120, 126. 



Ulothrix, 212-15 (figs.) ; filaments 

 of, 197, 207, 208, 210, 213 

 (fig.) ; habitat of, 195 ; Pal- 

 mella-stages of, 214, 215 (fig.) ; 

 sexual reproduction of, 213 

 (fig.). 214, 220 ; vegetative 

 reproduction of, 212, 215 (fig.) ; 

 zoospores of, 212-14 (fig.). 



Ulothrix zonata, 213 (fig.). 



Ulva. 198, 215 (fig.). 



Umbellifera;, 60, 61, 80, 88, 148, 

 153. 355. 356. 357- 



Underground parasites, 254. 



Undulation of epidermal walls, 93. 



Unicellular Algje, i, 181-92 (figs.), 

 795, 205, 206 (fig.), 20S-10 



(figs.) ; — Fungi, 255, 256 



(fig.) ; — growing points. 16-18 



(figs.) ; — hairs, loi, 103, 104. 

 Unisexual flowers, 354, 373 ; pro- 



thaUi, 313, 319, 321. 

 Uredineae, 143, 245-8 (fig.), 252, 253, 



407. 

 Uredospores, 245, 246 (fig.), 247. 

 Urtica, hairs of, 104, 105 (fig.) ; 



leaf-structure of, 38 (fig.), 39 ; 



root of, 132. 

 Usnea barbata, 258 (fig.). 

 Ustilagineas, 230, 245, 248, 252. 

 Ustilago longissima, 251 (fig.). 

 Uiricularia, 150. 



Vaccinium myrtilliis, pollen of, 

 362 (fig.) ; stem of, 167, 168 



(fig.). 



Vacuoles, 2 (fig.), 3, 5 (fig.), 6 (fig.), 

 26, 51; contractile — , 181, 182 

 (fig.), 187 (fig.), 193, 213 ; of 

 Desmids, 209; of Fungi, 231 ; 

 of Yeast, 255. 



Vanilla planifolia, 48. 



Vanillin, 48. 



Variation, 374-80 (figs.) ; measure- 

 ment of, 375-7 (fig.). 



Variation-curves, 376, 377 (fig.). 



Variegated leaves, iii. 



Varnish, 155. 



Vascular bundles, 76 ; bicoUateral, 

 81 (fig.), 82 ; collateral, 76, 78 

 (fig.), 79, 84, 85 (fig.), 112; 

 concentric, 85 (fig.), 86, 133 

 (fig.), 134, 292 (fig.) ; cortical, 

 86 ; medullary, 86 ; second- 

 ary, 133 (fig.). 134. 



Vascular cylinder, of aquatics, 

 i70-74(figs.) ; of root, 66 (fig.), 

 68 ; of stem, 78. 



Vascular system, 65 ; differentia- 

 tion of, 89. 



Vascular system of, aquatics, 170- 

 74 (figs.), 176 (fig.) ; cladodes, 

 160 ; Conifers, 339-41 (figs.), 

 343 ; Cycads, 322 ; Eqiiisetum, 

 311 (fig.) ; Ferns, 292-5 

 (figs.) ; leaves, 90, 107, 112- 

 14 (fig.) ; Lycopodium, 315 ; 

 Lyginopteris, 328-30 (fig.) ; 

 Mosses, 276 ; ovules, 325 (fig.), 

 326, 331. 332, 333 (fig.). 357. 

 358, 359 ; parasites, 179 ; 

 petioles, 113 (fig.) ; pulvini, 

 115, it6 (fig.) ; roots, 66 (fig.), 

 68, 70 (fig.) ; Selaginella, 317 ; 



