344 



INDEX 



Gravity replaced by centrifugal force, 71, 



72, 73 74 



sensory organs, reacting to, 72, 79, 82 

 Green, on ferments, 174, 265, 268, 271, 

 274 



on pulvini, 15 



on Dionaea, 1 8 

 Growth, 276-307 



conditions affecting, 299, 300 



correlations in, 302, 303 



course of 286, 287 



in cells of roots, 282, 283 



measurement by weight, 293, 294 

 of by auxanometer, 288, 293 



of oody, 283, 284, 285 



of leaf with netted veins, 286 

 parallel veins, 286 



of petioles and peduncles, 285 



of stems, 285 



periodicity of, 294, 295, 296, 297 

 Guttation, 188 



Haacke, method of measuring differences 



in electric potential, 103 

 Haberlandt, on transmission of impulses, 



13 



on perception of geotropic stimulus, 



72, 73 

 Hammarsten-Mandel, text-book of physi- 



ological chemistry, 159 

 Hansgirg, on irritable stamens and pistils, 



20 



on carpotropic movements, 307 

 Hanstein, on synthesis of proteids, 239 

 Harlow, on mycorhizas, 245 

 Harshberger, on thermotropic reactions 



of Rhododendron, 98, 99 

 Heald, on regeneration in mosses, 312 

 on toxic action of dilute acids and 



salts, 54 

 Heat, acclimatization to, 92, 93 



produced by respiration, 253, 262, 



263 



by fermentation, 263, 264 , 

 Hegler, on effect of Hertzian waves, 1 08 

 Heinricher, on bublets of Cystopteris, 



alternating stimulation of, 80 

 as host for Cuscuta, 248 

 curvatures of petioles of, 137 

 electrotropism of, 108 

 path of sap in, 213 

 rate of ascent of sap in, 214 

 storage substances in, 243 

 tension in stems of, 183 

 wilting of, 2H 

 See sunflower 



Heliostat, use of, 108, 109 

 Heliotropism, see phototropism 

 Hemp, transpiration of, 204 



water cultures of, 227 

 Helleborus foetidus, structure of stomata, 



196 



Hempel, gas burettes, 237 

 Heracleum, malic acid, in hairs of, 60 

 Hering, investigations on correlations in 



growth, 304 



Hertzian waves, 107, 108 

 Hibiscus reginae, callus formations of, 37, 



38 



Hickorynut, 1 14 

 Holt, and Lee, on theory of phototactic 



response, 135 

 Hippeastrum, carpotropic movements of, 



37 



Hordeum vulgare, in liquid hydrogen, 99 

 Horizontal microscope, 133 

 Huie, on changes in tentacles of Drosera, 



27, 272 

 Hyacinthus Belgicus, growth of, 291, 



295 



Hydrochloric acid, toxic action of, 53 

 Hydrogen, generation of, 42 

 Hydrogen peroxide, toxic action of, 49 

 Hydrotropism, 66, 67, 68, 69 



of plasmodia, 68, 69 



of roots, 67, 68 

 Hygrometer test for transpiration, 199, 



200, 201 

 Hyponasty, 114, 305, 306 



Illuminating gases, influence of, 45, 46 

 Illumination, variations in, no 



reactions due to, 1 10-146 

 Imbibition, nature of, 175 



increase in walls by, 176 



energy of, 176 



movements caused by, 178, 179 

 Impatiens as host for Cuscuta, 249 



parviflora, termination of vessels in 

 leaf of, 214 



path of sap in, 213 

 Impulses, in tendrils, 23 



method of transmission of, 8, 9 



phototropic, transmission of, 130 



rate of transmission, 13, 14 



summation of, 1 8, 24 



transmission of, in Mimosa, 16, 17 



transmission of, in roots, 8l 



traumatic, transmission of, 34, 35 

 Inductorium, 104, 105 

 Injuries, tissues formed in response to, 

 36, 37 



influence on respiration, 253 



