694 



INDEX. 



Hofmeister 



on reversal of heliotropic properties, 

 429 



on root-pressure, 90, 94, 95 

 von Kennel- 

 on cutin, 19 

 on filtration, 99 



on effect of high temperature on 

 seeds, 280 

 on negative pressure in vessels, 



H5. "7 



on transpiration, 100, 107 

 Holle 



on constructive metabolism of Mu- 

 sacese, 146 



on evolution of oxygen, 143 

 Holzner, on decomposition of absorbed 



sulphates, 149 

 Homodromous torsion, 514 

 Homosporous plants, 603 

 Hook -climbers (Fig. 47), 412 

 Hop, twining of (Fig. 54), 516 

 Hoppe, on daily period of heat-evo- 

 lution in Colocasia, 312 

 Hoppe-Seyler 



on alcoholic fermentation, 208 

 on aromatic substances, 232 

 on cholesterin, 220 

 on composition of chlorophyll, 154 

 on conversion of carbohydrates into 

 fat, 218 

 on etiolin, 241 



on the formation of acids in plants, 

 227 



on globulin, 25 

 on lecithin, 131 

 Horizontal position of dorsiventral 



organs, 470, 503 

 Hosseus 



on ammonia salts in plants, 150 

 on evolution of ammonia by ger- 

 minating seeds, 210 

 Hubert, on temperature of spadix of 



Colocasia, 304 



Humidity of air, relation of, to tran- 

 spiration, 1 08 

 Humus, 48 

 Hybrids, 648 ; hybridisation, reciprocal, 



648 

 Hydrodictyon utriculatum, reproduction 



of, 627 



Hydrogen, in food of plants, 125; evo- 

 lution of by plants, 209 

 Hydrotropism, of growing organs, 478, 



593; of plasmodia, 528 

 Hygroplasma, 656 

 Hygroscopic water, 48 

 Hypochlorin, 147 

 Hypocotyl, curvatures of, 367 

 Hyponasty, 366 



Idioplasm, 657 



Imbibition, 15, 37 ; heat evolved in, 37 ; 



influence of acids or alkalies on, 



38; of alcohol and salts on, 38; of 



temperature on, 38 

 Indican, 239 

 Indifferent line in cells of Characece, 



521 



Indigo, 239 

 Ingenhousz 



on absorption of nitrogen by plants, 



84 



on absorption of oxygen by leaves, 



79 



on dephlogistication of air, 140 

 on relation of plants to atmosphere, 



Intercalary growth in cell-wall of CEdo- 

 gonium, 337 



Intercalary zones of growth, 338 



Intramolecular oxygen, 203 



Intussusception, 16, 336 



Invertin, 190 



Ipomcea, twining of, 517 



Iron, in food of plants, 135 ; in chloro- 

 phyll-molecule, 154; influence of, on 

 formation of chlorophyll, 239 



Irritability, 37 1 ; action of anaesthetics 

 on, 549; of fatigue on, 302, 550; of 

 light on, 549 ; of temperature on, 55 1 ; 

 of supply of water on, 554 



Irritability ; conditions of, 548 ; localisa- 

 tion of, in root-tip, 468, 474, 479 ; of 

 growing organs, 416 ; of matureorgans, 

 519; of tendrils, 485; of twining 

 stems, 511; relation between geo- 

 tropic and heliotropic irritabilities, 



499 



Irritability, specific, 374 

 Irritable hairs of Dionoea, 548 (Fig. 63) 

 Isobilateral organs, 423 

 Isoetes, adventitious budding in, 635 ; 



development of antherozoids of, 639 

 Isosporous plants, 603, 629 

 Ivy, dorsiventrality of shoots of, 425 



JanczewsM, on callus in sieve-tubes, 



166 



Jodin, on oxidation of ethereal oil, 267 

 Johnson 



on analysis of plants, 122 

 on geotropism, 454 

 on hydrotropism, 477 

 Juniperus virginiana, fertilisation in 



(Fig. 71), 617 

 Jurgensen, on distribution of electricity 



in plants, 320, 322 

 Just- 

 on assimilation of carbon by plants, 

 144 



