INDEX 
Heliotropism, 386, 403, 404 
Hepatice, 400 
Heterospory, 438 
Heterostylism, 453 
Honey, 450 
Hop, 396 
Hoppe-SEYLER on chlorophyll, 149, 
182 
Humus, 72 
Hybridisation, 456 
Hydrocyanic acid, 173, 259 
Hydrogen peroxide in photosynthe- 
sis, 159, 160 
Hydrophilous flowers, 449 
Hydrotropism, 400 
Hypnum, 191 
Hyponasty, 320 
Individual, 421 
Insectivorous plants; Utricularia, 
192; Sarracenia, 194; Nepenthes, 
196; Drosphyllum, 197; Pin- 
guicula, 197; Dionea, 197, 199 ; 
Drosera, 198 
Intercellular passages, 36, 37; for- 
mation of, 37, 110; function of, 
39, 110; watery vapour in, 79; 
in Isoétes, 112, 339; in Marsilea, 
118, 341; relation to stomata, 
117; ratio to cellular issue- in’ | 
leaves, 119; composition of air 
in, 119, 120; positive gaseous 
pressure in, 123; in aquatic 
plants, 337 
Intercellular substance, 51 
Internal pressure as a stimulus, 405 
Intussusception, 50 
Inulase, 254, 256 
Inulin, 238 
Invertase, 254, 256, 454 
Iodine, 135, 180, 186 
Iron, in ash of plants, 135, 180; 
combinations of absorbed, 141, 
184; relation to chlorophyll, 154 ; 
function of, 183 
Trritability, 365, 402 
Isoétes, 112, 113, 339, 439 
JUMELLE on decomposition of car- 
bon dioxide, 155 
Juncus, 33 
Kachree gourd, 258 
Karyokinesis, 422 
465 
Katabolism, 129, 264 
Kephir, 202 
Klinostat, 390 
Kwigut on action of centrifugal 
force on the direction of growth, 
SOL 
Laccase, 187, 305 
Lactase, 256 
Latent period of response to stimu- 
lation, 416 
Lathrea, 208 
Laticiferous systems, 226 
Leaves, sclerenchyma of, 34 ; rolled, 
117; irritability of, 379 
Lecithin, 182, 260 
Leguminose, cotyledons of, 45; 
absorption of nitrogen by, 140, 
170, 203 ; irritability of leaves of, 
379 
Lenticels, 39, 55, 81 
Leucin, 172 
Leucoplasts, 153, 235 
Lichens, 202 
Light, influence of, on transpiration, 
100; absorption of, by chlorophyll, 
148, 285 ; necessary for formation — ~ 
of chlorophyll,-153; action in 
photosynthesis, 155, 162; tonic 
influence of, 367; effect of, on 
differentiation of leaves, 368; 
effect on growth, 372; lateral, 
385 
Lignin, 52, 55, 277 
Lipase, 254, 260 
Lithium, 86, 181 
Locomotion, 283, 353, 355 
Lycopodium, 45, 191 
Lythrum, 453 
MacaLLuM on 
nucleus, 184 
McNaz on measuring rate of ascent 
of sap, 86 
Magnesium, in ash, 135, 141, 180; 
mode of absorption of, 183 
Malice acid, attraction for anthero- 
zoids, 401 
Maltase, 254 
Malto-dextrin, 255 
Manganese, 135, 180, 186 
Marchantia, photo-epinasty of, 371, 
388 
Marsilea, 56, 113 
Massula of Azolla, 451 
composition of 
30 
