348 



INDEX 



Phalaris canariensis , phototropic experi- 

 ments with, 129 

 Phaseolus, correlative changes in growth 

 of, 3°4 

 decrease o£ weight in respiration, 256 

 differentiation of tissues of, under 



compression, 31 

 growth of roots of, 282, 283 



stems of, 285 

 sensitiveness to light, 132 

 water cultures of, 223 

 Phenol, toxic action of, 55 

 Philotria, buds of, 321, 322 



influence of ammonia on. 47 

 of electricity on, 104 

 of freezing on, 95 

 permeability of membranes, 180 

 photosynthetic relations to light, 120 

 effect of desiccation on, 66 

 streaming movements of protoplasm, 



41 

 Phloroglucin in, test for, 152 



toxic action of, 55 

 Phoenix dadylifera, curvature of roots, 81 

 Phoradendron, 249 

 Phosphorescence, 253 

 Photeolic movements, 140-144 

 Photolytic movements, 140, 141 

 Photosynthesis, 227, 237 

 by bacteria, 237 

 conditions affecting, 232, 233 

 critical points in light intensity to, 1 20 

 influence of amount of carbon dioxide 



on, 233, 234 

 of temperature on, 234 

 of portions of spectrum on, 234, 235 

 Phototropic chamber, 129 



relations of light to plants, 132, 133 

 Phyc&myces nitens, chemotropism of, 62 

 hydrotropism of, 67 

 reaction to Hertzian waves, 108 

 Pinus, formation of chlorophyl in dark- 

 ness by, 118 

 Piper porphyraceum, velvety surfaces of 



leaves, 1 25, 126 

 Pimm, correlative changes in growth of, 



304 

 determination of storage substances 



in, 243 



differentiation of tissues under com- 

 pression, 31 



growth of roots of, 282, 283 



in liquid hydrogen, 90 



production of heat in respiration of, 

 263 



root-system of, 33 



sensitiveness to light, 132 



Plasmodia, hydrotropism of, 68, 69 

 Plasmolysis, 179, 180 

 Plastic material, translocation of, 239, 240 

 Poa, propagation of, 324, 325 

 Podophyllum, nuclear division in, 281 

 Poisons, catalytic, 49, 50, 51, 52 



oxidizing, 47, 48, 49 



proteinace'ous substances, 55, 5° 



substitution, 54, 55 



which form salts, 52, 53, 54 

 Polarized light, action of sugars on, 148 

 Polarity, 302, 303 

 Pollen, chemotropism of, 60-62 

 Pollock, on curvatures of roots, 82 

 Polygonum viviparum, propagation of, 



325 

 Polysaccharids, 149, 150 

 Polystichum angulare, adventitious buds 



of, 3H 

 Pontederia, carpotropic movements of,307 

 Poplar, polarity of branches, 88 

 Populus, callus formation by, 38 



length of air passages in, 194, 195 

 lenticels of, 192, 193 

 pressure in stems of, 216 

 propagation by roots, 316 

 Potassium, origin and uses of, 218, 219 

 chlorate, poisonous effects of, 48 

 hydrate, toxic action of, 54 

 permanganate, poisonouseffectsof,48 

 Pofamogeton, buds of, 321 

 Potato, influence of cold on resting 

 tubers, 94 

 influence of light on formation of 



tubers, 144, 146 

 See Solanum 

 Potometer, 207, 208, 209, 210, 211 

 Presentation period, in geotropic reac- 

 tions, 72, 73, 74, 76 

 Primula Forbesii, propagation of, 325 

 Sinensis, passage of air through 

 leaves of, 191, 192 

 Primordial leaf-forms produced in diffuse 



light, 143 

 Progeotropism, 75 

 Prophototropism, 1 27 

 See heliotropism 

 Proteids, classification of, 159, 160, 161 

 extraction of, 161 

 general qualitative test for, 162, 163, 



164 

 properties of, 159, 16b 

 separation of, 161 

 soluble in acid and alkali, tests for, 



166, 167 

 soluble in alcohol, tests for, 166, 

 167 



