INDEX 



465 



Heliotropism, 386, 403, 404 



Hepaticce, 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 ; Dioncea, 197, 199 ; 

 Drosera, 198 



Intercellular passages, 36, 37 ; for- 

 mation of, 37, 110 ; function of, 

 39, 110 ; watery vapour in, 79 ; 

 in Isoetes, 112, 339 ; in Marsilea, 

 113, 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 



Irritability, 365, 402 



Isoetes, 112, 113, 339, 439 



JUMELLE on decomposition of car 



bon dioxide, 155 

 Juncus, 33 



Kachree gourd, 258 

 Karyo kinesis, 422 



Katabolism, 129, 264 



Kephir, 202 



Klinostat, 390 



KNIGHT on action of centrifugal 



force on the direction of growth, 



391 



Laccase, 187, 305 



Lactase, 256 



Latent period of response to stimu- 

 lation, 416 



Lathrcea, 208 



Laticiferous systems, 226 



Leaves, sclerenchyma of, 34 ; rolled, 

 117 ; irritability of, 379 



Lecithin, 182, 260 



Leguminosce, 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 composition of 



nucleus, 184 

 McNAB on measuring rate of ascent 



of sap, 86 

 Magnesium, in ash, 135, 141, 180 ; 



mode of absorption of, 183 

 Malic acid, attraction for anthero- 



zoiids, 401 

 Maltase, 254 

 Malto-dextrin, 255 

 Manganese, 135, 180, 186 

 Marchantia, photo-epinasty of, 371, 



388 



Marsilea, 56, 113 

 Massula of Azolla, 451 



30 



