INDEX 



457 



Wax, 93, loi, i6i, 174. 



Wellingtonia (Sequoia), cone of, 

 347, 352 (fig.). 



Wetting of leaf-surface, prevention 

 of, 93, loi, 103. 



Wheat (Triiicuin), grains of, 52 

 (fig). 53, 384 ; — mildew {Ery 

 siphe graminis) , 243 ; — rust 

 (Puccinia graminis), 245-7 

 (fig-), 2.53, 384 ; — smut (Us- 

 tilago) , 230. 248. 



Whisky, 257. 



White Convolvulus (C. sepium), 

 153 ; — Dead Nettle (Lamium 

 album), 4, 105 ; — Deal (Picea 

 excelsa), 129 ; — Lily (Lilium), 

 no; — Mustard (Sinapis alba), 

 69; — Pine (Abies pectinata), 

 129; — Rust of Cruciferas (Cys- 

 topus candidiis) , 231-4 (fig.) ; 



— Stonecrop (Sediim album), 

 116. 



Wholemeal bread, 52. 



Whorled branching, 310, 311 (fig.) ; 



— flowers, 355. 

 Whortleberry ( Vaceinium myrtillus) , 



pollen of, 362 (fig.) ; stem of, 



167, 168 (fig.). 

 Wild Hyacinth (Scilla nutans), 44, 



365 ; — Strawberry (Fragaria 



vesca), 146. 

 Willow (Salix), 48, 103, 137, 139, 



354, 389 ; wood of, 121, 124, 



126, 128. 



Willow-herb (Epilobium), 103, 174; 



pollen of, 362 (fig.). 

 Wilting and stomata, 100. 

 Wind-pollinated plants, 326, 330, 



345. 348, 354. 361, 373- 

 Wine, 256. 

 Winged stems, 167. 

 Woad (I satis tinctoria), 48. 

 Wood. See Xylem. 

 Wood Anemone (A. nemorosa), 148, 



248; — Sorrel (Oxalis acetosella), 



95 ; — Spurge (Euphorbia amyg- 



daloides), 153. 

 Wood-fibres, 33, 121, 123 (fig), 125, 



127, 128 (fig.). 

 Wood-parenchyma, 79, 83, 86 ; of 



Ferns, 292 (fig.), 293 (fig.) ; of 

 leaf, 112, 113; of secondary 

 wood, 121, 122, 123 (fig.), 124, 

 126, 132. 



Wood-pulp, 35. 



Wood-vessels. See Vessels. 



Woodland plants, structure of, 

 168, 169, 178, 379. 



I Woody perennials, 40, 364 ; phloem 

 of, 82 ; root of, 70 ; secondary 



I growth of, 117 et seq. 



' Wound parasites, 252, 253 



' Wounds, effect of, 26, 252 ; healing 

 of, 64, 1«, 142, 155. 



Xanthophyll, 109. 

 Xanthoprotein reaction, 50. 

 Xanthoria parietina 258 (fig ) 260 



(fig.). 

 Xerophytes, 158. See also Dry 



habitats, plants of. 

 Xylaria hypoxylon, 239 (fig.). 

 X5dem, 27, 32, 33, 36, 37, 65 ; 



function of, 65, 88, 112 ; 



primary, 66 et seq., 78 ei seq., 



112 et seq. ; secondary 33 

 T18, 119-26 (figs.). 



Xylem of, aquatics, 171 (fig), 172, 



173 (fig.). 174 (fig.). 176 (fig.) ; 



Conifers, 37 (fig.), 127, 339 

 (fig.) ; Ferns, 292-4 (figs.) ; 

 leaf of Angiosperms, 107, 112, 



113 ; parasites and saprophytes, 

 178, 179; petiole, 113 (fig.); 

 root of Angiosperms, 66 et seq. 

 (figs.) ; stem of Angiosperms, 

 78 et seq. (figs.). 



Xylem-canal of aquatics, 171 (fig.), 

 172, 174 (fig.) ; Monocotyle- 

 dons, 36, 85 (fig.), 86. 



Yeast (Saccharomvces), physiology 

 of, 53, 54. 56, 57. 256, 257, 

 265 ; structure and reproduc- 

 tion of, 2.55, 256 (fig.). 



Yellow Dead-nettle (Lamium gale- 

 obdolon), 168, 169 (fig.) ; — Pim- 

 pernel (Lysimachia vemornm), 

 160 (fig.) ; — Pine (Pinus stro- 

 biis), 129; — Rattle (Rhinan- 

 thits), 144, 145 (fig.). 



Yew (Taxus baccata), 128, 334, 

 408 ; female cone of, 346 (fig.) ; 

 habit of, 335, 346 (fig.) ; leaf- 

 structure of, 341, 342 (fig.) ; 

 male cones of, 344, 345, 346 

 (fig.) ; ovules of, 346 ; seeds 

 of, 346 (fig.), 351 ; stem of, 



339. 

 Yorkshire Fog (Holctis mollis). 112. 



Zea mats, disease of, 248 ; grains 

 of, 45, 52, 53, 384 ; hybrid- 

 endosperm of, 386 ; leaf of, 



