424 



INDEX 



Dog's Mercury (Mercurialis peren- 

 nis), leaf of, 37 (fig.), 59 (fig.), 

 168, 169; petiole of, 113 (fig.). 



Dogwood [Covnus sauguijiea), galls 



of, 143 (fig-)- 

 Dominant characters, 384 et seq. 

 Dormant characters (of hybrids), 



382. 

 Dorsiventral leaves, structure of, 



qS. 107-11 (figs.), 116, 295, 



341. 342 (fig.). 

 Double chromosomes. 306. 

 Double fertilisation, 368. 

 Dou,glas Fir (Pseudotsuga douglasii), 



128, 129; cone of, 352 (fig.), 



353- 

 Dragon Tree {Dractzua). secondary 



thickening of, 133 (fig.), 134. 

 Drapariialdia, 197 (fig.). 

 Drosera, tentacles of, 150. 

 Drought, resistance to, 186, 191, 



205, 215, 269, 271. 

 Dr)^ habitats, structural features of 



plants of, 38, 88, 92, 94, 96, 



III, 158-66. 

 " Dry rot " of timber (MeruUus 



lacyvmans) , 2^2. 

 Duckweed (Lemna), 112, 260. 

 Dunes, 163. 

 Dwarf-males (of CEdogoninm), 221 



(fig.), 223. 

 Dwarf-shoots (of Conifers), 335, 



336 (fig.), 337, 338. 

 Dyes, vegetable, 64, 126, 261. 

 Dynamite and Diatoms, 207. 



Eau de Cologne, 62. 



Eau de Javellc, 401 ; and lignified 



walls, 32. 

 Ebony (Diospyros), 126. 

 Echeveria retusa. 365. 

 Economic plants, 34, 35, 39, 43, 45, 



28. 



49. 53. 



103, 124, 120, 



140. 155. 157. -°3. -04. -07. 

 255, 256. 257, 261, 276, 323, 

 334. 337. 35-!. 

 Economic utilisation of. Alga?, 203, 

 204 ; alkaloids, 61 ; Bacteria, 

 265 ; Bog-moss {Spliagiuiiii), 

 276; Conifers, 127, 129, 334, 

 337. 35^ ; cork, 136, 140 ; 

 Diatoms, 207 ; ethereal oils, 

 62 ; fats, 49 ; fibres, 34. 

 35; Fungi, 255, 256, 257; 

 glucosides, 48 ; gums, 39 ; 

 hairs, 103 ; latex, 155, 157 ; 

 Lichens, 261 ; starches, 43 ; 

 .sugars, 45, 124; timber, 126, 



127-30 ; vegetable pigments, 

 64, 126, 



Economy of water, 158-66. 



Ectocarpiis. 199 ; habitat of, 195 ; 

 sexual reproduction of , 212, 219 

 (fig.), 220 ; structure of, 198, 

 219 (fig.) ; zoospores of, 218, 

 219 (fig.). 



Ectocarpus httoraJis. 219 (fig.). 



Ectotrophic mycorrhiza, 72. 



Edible plants, 43, 44. 45, 48, 49, 

 52. 53. 60. 203, 204, 255, 261. 

 352. 



Egg (ovum). 220 ; of Alga?. 220, 

 221 (fig.), 222, 224, 226 ; of 

 Angiosperms, 357 (fig.), 366 

 (fig.), 367 (fig.), 368; of Coni- 

 fers. 348, 349 (fig.) ; of Cycads, 

 326, 327 (fig.) ; of Ferns, 302, 

 303 (fig.) ; of Fungi, 233 (fig.), 

 234. 236 ; of Liverworts, 280, 

 281 (fig.) ; of Mosses. 280; of 

 Sclagitiella, 319, 320 (fig.). 



Egg-apparatus (of Angiosperms), 

 366 (fig.). 



Elaborated food-material, conduc- 

 tion of, in Angiosperms, 28, 65, 

 88, 110. Ill, 112; aquatics. 

 171 ; Conifers. 343 ; Mosses, 

 276 ; by laticiferous elements, 

 156 ; by the x\-lem. 124. 



EIrEagiuts, 103. 



Elasticity, of coUenchyma, 31, 33 ; 

 of cork. 137 : of fibres, 33 ; of 

 wood. 127, 128. 



Elaters (of Liverworts) 271 (fig) 

 282. 283 (fig.). 



Elder {Sambucus), cork of. 1^6 

 (fig.) ; leaf of. no, in (fig.) ; 

 lenticels of, 140 (fig.) ; pith of, 



30 (fig). 151. 



Elm (Ulmiis), 130, 139. 141. 365 : 

 Cork — . 141 ; secondarv wnod 

 of. 120, 126. 



Elodca canadensis, cell-structure. 

 5, <) (fig.) ; spread of. in British 

 Isles. 392 (fig.). 



Elongation, zone of. in root, 65. 



Embryo of, Angiosperms, 367, 368- 

 72 (figs.) ; Conifers, 350-52 

 (fig), 370 ; Cycads, 326. 327 

 (fig-). 332. 333 ; Dicotyledons. 

 368-71 (figs.) ; Ferns, 294. 

 302-4 (fig.) ; Fiiais, 221 

 (fig.), 22U; Li\-crworts, 2S2 ; 

 Monocotyledons. 370, 371 (fig.); 

 Mosses, 284, 285 (fig.) ; para- 

 sitic Angiosperms, 179, 372; 



