INDEX 



375 



H 



Haberlandt, on geotropism, 327 

 on temperature in growth, 299 

 on wound hormones, 310-311 

 Hales, on translocation of sub- 

 stances, 246 

 Halophytes, 91, 144 

 Harden and Young, on fermenta- 

 tion, 264 

 Hardiness, 126-128 

 Harmonious optimum, in growth, 



300 

 Harvey, on artificial light for plant 



growth, 42 

 Heinricher, on semiparasites, 237 

 Heliotropism, 314 



Hellriegel, on law of the mini- 

 mum, 85 

 on nodules on roots, 59-61 

 on pot culture, 81 

 Hemicelluloses, 204 

 Heterotropic organisms, 53 

 Hill, on enzymes, 214 

 Hormones, 303, 310-311, 328, 341, 

 352, 362, 364 

 growth, 287-288, 319 

 Hydrogen-ion concentration in soils, 



94-98 

 Hydrolytic enzymes, 206-209, 216, 



224, 225 

 Hydrophytes, 173-177 

 Hydrotropism, 329-332 

 Hygroscopic water, 144 



Iljin, on stomata, 166 



Illumination, electric, for growth of 

 plants, 42 



Imbibitional water, 144 



Impermeability, of plasma mem- 

 brane, 112-113, 123-124 



Incipient drying, 171 



Indispensable mineral elements, 66- 

 67 



Infiltration, 167 



Ingen-Housz, on light in carbon 

 assimilation, 25 



Inhibition, of organisms, 299 



Insectivorous plants, 236-243 

 Inulin, 204-205 

 Invertase, 209 

 Iron, bacteria, 257 



in chlorophyll formation, 23-24 



role in metabolism, 74 

 Ivanov, on fermentation, 264 



on transpiration, 156 



Johannsen, on forcing, 291, 292 



K 

 Karrer, on starch, 203 

 Kiesel, on composition of proto- 

 plasm, 230 

 Kiesselbach, on stomata in corn, 36 

 Klebs, on carbohydrate-nitrogen 

 relationship in development, 

 346-347 

 on effects of light in development, 

 346 

 Klinostat, 323-324 

 Knight, on geotropism, 322-323 

 Knop, on principal elements in nutri- 

 tion, 67 

 Knop's solution, 8, 75 

 Kossowitch, on pot cultures, 81 



on nitrogen in soils, 51-52 

 Kostytschev, on fermentation, 269 



alcoholic, 263 

 Krascheninnikov, on energy accu- 

 mulation, 31 

 Kraus and Kraybill, on carbohy- 

 drate - nitrogen relationship, 

 347 



L 



Lactic-acid fermentation, 265-266 



Law of the minimum, 84-85 



Lawes and Gilbert, on value of 



legumes in crop rotation, 63 

 Layering, 358-359 

 Leaf mosaic, 317 

 Lecithin, 217-218 



Leguminous plants, assimilation of 

 nitrogen by, 59-63 

 nodules of, 59-61 



