INDEX 



345 



Inorganic matter, separation from organic, 

 170 



constituents of, 170, 171, 217-219 

 Incubator, 92 

 Invertase, 174 

 Ions, of dissociated substances, 52, 53 



toxic action of, 52, 53, 54 



action of, in chemotaxis, 58, 59 

 Iris, structure of stomata of, 197, 198 

 Iron, uses of, 218 

 Irritability, defined, 4, 6 



mechanism of, 7 



to external forces, 4 



to internal forces, 6 



Jennings, on movements and motor re- 

 flexes, 58 



Johannsen, on forcing of plants by ether, 

 298 



Joly, Dixon and, on ascent of sap, 216 



Jorgensen, on micro-organisms and fer- 

 mentation, 264 



Jost, on curvature of old branches, 84 

 on influence of heat on germination, 



93 



on motility of plants in darkness, 113 

 on nyctitropic movements, 142 

 on rhythm in darkness, 141, 142 



Kaki-fruit, 274 



Kantia, gemmae of, 312 



Kahlenberg, and True, on toxic action of 



dissociated salts, 52, 53, 54 

 Kerner, on gemmae, 311 



on thermal constants, 97 

 Kindsel, on influence of temperature on 



germination, 93 

 Kinney, on influence of electricity on 



germination, 106 



Kirkwood, on composition of plants, 147 

 Klebs, on reproduction, 327 

 Klein, on differences in electric potential 



in plants, 103 



Kohl, on transpiration, 204 

 Kohnstamm, on ferments, in fungi, 270 

 Krabbe, investigations on diastase, 268 

 Kuhne, on influence of electric stimula- 

 tion upon protoplasm, 105 

 Kunkel, True and, on poisonous effects 



of phenols, 55 

 Kiister, on the formation and anatomy of 



galls, 64 

 Kraemer, on the changes ensuing in galls, 



64 



Lactnca scariola, compass position of 

 leaves, 139, 140 



Laminaria, imbibition by walls of, 176 

 Landolt, description of color filters, 131 

 Latent period, in geotropism, 72-75 

 Laurel, 97 



Laurent, on dialysis of enzymes, 266 

 Lee, Holt and, theory of phototactic re- 

 sponse, 135 

 Leclerc du Sablon, Bonnier and, on growth 



of stems, 284, 285 

 Lemna trisulca, photeolic positions of 



chloroplasts, 141 

 water cultures of, 226 

 Lengerkin, on tendrils of Ampelopis, 



27 



Lenticels, 192, 193, 194 

 Lepidium, thermotropic reactions of, 99 

 sensitiveness to light, 132 

 zones of curvature of seedlings, 136 

 Leucodon.) brood-bodies of, 311 

 Lichens, arrangement of components of, 



248 



Light, absorption by tissues, 119 

 action of on bacteria, 1 12 

 action on chlorophyl solutions, 124 

 chemical action of, III, 1 12, 113 

 critical points in, 112, 120, 132 

 electrical effects of, 103 

 formative influence of, 142, 146 

 disintegration of chlorophyl by, 117, 



1x8 

 influence of, on form of flowers, 1 14 



on growth, i n-i iS 

 photosynthesis, by aid of, 123, 124 

 rays inducing phototropic reactions, 



130 



relation of to plants, 110-146 

 stimulating influence of, 127 

 trophic relations of, III 

 variations in intensity, no 

 waves of, 1 10 

 Litium, bulbils of, 321 

 Linin, 220 



Linsbauer, on permeability of leaves by- 

 light, 119 



Liriodendron, propagation by roots, 316 

 Lithium test for rapidity of ascent of sap, 



214 

 Livingstone, on influence of chemicals on 



algae, 40, 64, 327 

 Lloyd, MacDougal and, on mycorhizas, 



247 

 Loeb, on artificial parthogenesis, 64 



on influence of Hertzian waves, loS 

 Loew, on oxydizing enzymes, 274 



on physiological role of mineral nu- 

 trients, 219 

 on poisons, 56 



