INDEX 
a eae on chlorophyll, 144, 
77 
Humus, 67 
Hybridisation, 446 
Hydrocyanic acid, 168, 254 
Hydrogen peroxide in photosynthe- 
sis, 154, 156 
Hydrophilous flowers, 439 
Hydrotropism, 391 
AHypnum, 185 
Hyponasty, 314 
Individual, 411 
Insectivorous plants, 135; Utricu- 
laria, 187; Sarracenia, 189; 
Nepenthes, 190; Drosophyllum, 
191; Pinguicula, 191; Dionea, 
192,193; Drosera, 192 
Intercellular passages, 31, 32; for- 
mation of, 32, 104; function of, 
34, 104; watery vapour in, 74; 
in Isoétes, 106, 332; in Marsilea, 
107, 334; relation to stomata, 
111; ratio to cellular tissue in 
leaves, 113; composition of air 
in, 113, 114; positive gaseous 
pressure in, 117; in aquatic 
plants, 331 
Intercellular substance, 45 
Inulase, 248, 250 
Inulin, 232 
Invertase, 248, 250, 444 
Iodine, 129, 175, 181 
Iron, in ash of plants, 129, 175; 
combinations absorbed, 136, 179; 
relation to chlorophyll, 149 ; 
function of, 178 
Irritability, 358, 393 
Isoétes, 106, 107, 332, 430 
JumMELLE on decomposition of car- 
bon dioxide, 150 
Juncus, 28, 29 
Kachree gourd, 252 
Karyokinesis, 413 
Katabolism, 123, 258 
Kephir, 196 
Klinostat, 380 
Kyicut on action of centrifugal 
force on the direction of growth, 
382 
Laccase, 181, 299 - 
Lactase, 250 a 
455 
Latent period of response to stimu- 
lation, 407 
Lathrea, 202 
Laticiferous systems, 220 
Leaves, sclerenchyma of, 27; rolled, 
112; irritability of, 372 
Lecithin, 177, 254 
Leguminose, cotyledons of, 40; 
absorption of nitrogen by, 134, 
165, 196 ; irritability of leaves of, 
371 
Lenticels, 34, 76 
Leucin, 167 
Leucoplasts, 148, 229 
Lichens, 196 
Light, influence of, on transpiration, 
95; absorption of, by chlorophyll, 
148, 279; necessary for formation 
of chlorophyll, 148; action in 
photosynthesis, 149, 156; tonic 
influence of, 359; effect of, on 
differentiation of leaves, 360; 
effect on growth, 364; lateral, 
377 
Lignin, 47, 50, 271 
Lipase, 248, 254 
Lithium, 175 
Locomotion, 276, 347, 348 
Lycopodium, 40, 185 
Lythrum, 443 
MacaLtLuM = on 
nucleus, 178 
Magnesium, in ash, 129, 136, 175; 
mode of absorption of, 178 
Malic acid, attraction for anthero- 
zoids, 392 
Maltase, 248 
Malto-dextrin, 249 
Manganese, 129, 175, 181 
Marchantia, photo-epinasty of, 363, 
379 
Marsilea, 51, 107 
Massula of Azolla, 441 
Medullary rays, influence of, on 
transpiration current, 81; as store- 
houses of reserve material, 225 
Megaspores, 429 
Melampyrum, 203 
Melibiase, 250 
Melizitase, 250 
Mesocarpea, 422 
Mesocarpus, 357, 363, 403 
Metabolism, 6, 123, 258 
Metapectic acid, 42 
Metapectine, 42 
Meta-proteins, 163 
Methane, 168 
composition of 
