INDEX AND GLOSSARY 



68 1 



Immune varieties, of Potato, 410; of 

 Wheat, 440. 



Immunity, where two organisms may 

 be in relation, but neither has 

 power against the other, 235 ; to 

 bacteria, 453. 



Inarching, or approach-grafting, 250 

 (Fig. 175). 



Indigo, preparation of, 452. 



Indusium, of Ferns, 495 (Fig. 387). 



Infection-threads of root-nodule, 

 236. 



Inferior, applied to the ovary w r hen 

 sunk below the level of the other 

 floral parts, 272 (Figs. 197, 198). 



Inflorescence, a common branch- 

 system bearing a number of flowers, 

 257 (Chap, xiv.) ; definite or cy- 

 mose inflorescence, 258 (Fig. 179) ; 

 indefinite or racemose, 258 (Fig. 

 179) ; radial and dorsiventral, 262. 



Inheritance, Chap. xxxv. : parti- 

 culate, 584. 



Integuments, the coverings investing 

 the nucellus of an ovule, 294 (Figs. 

 216, 217). 



Intercalary growth, in Algae, 379. 



Intercalation in leaves, 351. 



Intercellular spaces, 43, 73 (Fig. 48), 

 75 (Fig. 49), 76 (Figs. 51-53). 



Interchange of gases, in photo- 

 synthesis and respiration, Chap. 



vin. 



Interpolation of parts, where extra 

 primordia appear in spaces norm- 

 ally unoccupied, 266 (Fig. 191). 



Interpolation-theory of alternation, 



546, 547- 



Intrusive hyphae, in algal construc- 

 tion, 380. 



Inulin, storage of, in Dahlia, 124. 



Invertase, an enzyme which converts 

 cane sugar into invert sugar, 123, 

 129. 



Involucre, a group of protective 

 bracts, 260 (Fig. 186), 648 (Fig. 

 498), 652 (Fig. 502). 



Iridaceae, 609 (Fig. 458). 



Iris, perennial stock of, 196 (Fig. 

 129) ; leaf arrangement of, 205 ; 

 dehiscence of anthers, 281 (Figs. 

 201, 202) ; flower of, 609 (Fig. 458). 



Irish Potato Famine, 396. 



Iron, as catalyst, 112 ; in chlorophyll- 

 formation, 116. 



Iron Bacteria, 451. 



Irregular nutrition, obtaining organic 

 substance by some other process 

 than by photosynthesis (Chap, 

 xii.) ; secondary in Flowering 



Plants, 242 ; in Thallophytes, 



Chap. xxiv. 

 Irregular propagation, 587. 

 Irritability, power of response to 



stimulus, 31, 153-167. 

 Isoetes lacustris, 511 ; stock of, 514. 

 Isogametes, sexual cells of equal size, 



362, 370 (Fig. 275), 557 ; in 



Phaeophyceae, 381. 

 Isolation mechanisms, in Fvolution, 



585. 

 Isomorphic alternation, 381, 384. 

 Ivy, skeleton of lamina, 71 (Fig. 



46) ; climbing shoots negatively 



phototropic, 159 ; adhesive roots, 



217. 



Juncaceae, O14. 



Juncus lamprocarpus, 614 (Fig. 461). 

 Jungermanniales, 473 (Fig. 369) ; 

 size-structure correlation in, 601. 

 Juniper, 527. 



Karyotype, the type of chromosome 

 complement characteristic of a race 

 or individual, 567 (Fig. 434). 



Kidney Bean, 8 ; analysis of, 655. 



Klinostat, a clock-work arrangement 

 for slowly rotating a plant under 

 experiment, 155. 



Knight's Wheel, 155. 



Knop's culture solution, 111. 



Krakatau, new flora of, 331, 377. 



Labellum, of orchids, 612 (Fig. 460). 



Labiatae, 645 (Fig. 496). 



Laburnum, hard wood of, 64 ; zygo- 

 morphy of, 274 (Fig. 199). 



Lactuca, as a compass-plant, 159. 



Lactuca scariola v. sativa (Lettuce), 

 percentage of water in, 95 ; analy- 

 sis of, 655. 



Lamina, the leaf-blade, 69 ; struc- 

 ture of, 72 (Figs. 47, 48), 75 (Fig. 

 49) ; venation of, 188 (Fig. 123) ; 

 nature of, 348, 351. 



Laminaria, 378 (Fig. 281) ; 380 ; 

 gametophyte of, 383 (Fig. 286) ; 

 alternation in, 384 ; life cycle of, 



387. 545. 552. 

 Lamium, mechanical construction of 



stem of, 184 (Fig. 117) ; L. album 

 (Dead-Nettie), 645 (Fig. 496). 



Land Flora, origin of, 546. 



Land-habit, Chap, xxxiv : 548. 



Land plants, internal embryology of, 

 Chap, xxxiv. 



