INDEX 



347 



Myxomycetes, reactions to moisture, 67, 

 68, 69 

 reactions to shock, 10, 11 



Narcissus, diageotropism of flowers, 85 



etiolation of, 117, 118 



growth of scape, 285. 



propagation by bulbs, 317 

 Nasturtium officinale, buds on leaves of, 



324 

 Nectarial excretion, 185, 188 

 Nematogones, 311, 312 

 Nemec, on geotropism, 73 



on transmission of stimuli, 8, 9, 13, 

 14. 16, 25, 35, 81 

 Neottia, mycorhizas of, 248 

 Nepenthes, digestive action of, 272 

 Newcombe, on cellulose dissolving en- 

 zymes, 270 

 Nicotiana, tensions in, 183 

 Nitrogen, origin and uses, 218 

 Nitrogenous substances, synthesis of, 238 

 Noll, on geotropism, 72 



on origin of secondary roots, 33 

 Nucleus, division of, 278, 279, 280, 281, 



282 

 Nutrition, special types of, 243, 244 

 Nutritive elements, 222, 223 



solutions, 224, 225 

 Nyctitropic movements, 140-144 



Oak, ascent of sap in, 213 

 galls of, 64 

 lenticels of, 192 

 See Quercus 

 Oltmanns, on positive and negative helio- 



tropism, 135 

 Ono, on influence of salts upon fungi and 



algae, 63 

 Opunlia, reactions of stamens to shock, 



19, 23 

 Organism, nature and relations of, 1-9 

 Osborne and Campbell, on conglutin and 

 vitellin, 167 

 on the nucleic acid of the em- 

 bryo of wheat and its protein 

 compounds, 167 

 Osborne and Voorhees, on proteids of the 

 wheat kernel, kidney bean 

 and cotton seed, 167 

 on some definite compounds of 



protein bodies, 167 

 study of the proteids of rye and 

 barley, 167 

 Osmometer, 181 



Osmose, change in osmotic qualities of 

 membranes, 180, 181 



Osmose in cells, 179 



Osmunda, formation of chlorophyl in, in 



darkness, 118 

 Osborne, on chemical nature of diastase, 



174 

 Oxalic acid, toxic action of, 54 

 Oxalis, effect of chloroform upon, 50 



nyctitropic movements of, 141 

 Oxidases, 273, 274 

 Oxidizing poisons, 47, 48, 49 

 Oxygen, growth in, 45 



origin of supply, and uses, 217, 218 



preparation of, 45 



relations of to plants, 40, 45 



Palladine, on respiration, 252, 262 



Paraphototropism, 138, 141 

 See paraheliotropism 



Parasites, fungous, relation to host, 248 



Passiflora, action of nectaries of, 1 88 

 tendrils of, 22-27 



Passion flower, 24 



Peas, curvature of roots, 28 



diageotropism of secondary roots, 82 

 imbibition by seeds of, 177 

 mechanism of curvature of roots, 81, 



88 

 relation of to electricity, 106, 108 

 resistance of seeds to desiccation, 66 



to heat, 92 

 respiration of, 262 



Pectase, 273 



Peirce, investigations on Cuscuta, 249 



Peltandra, aecidium on, 248 



Penicillium, chemotropism of, 62 

 critical temperatures for, 91 

 nutrition of, 245, 246 

 respiration of, 252 



Peptone, tests for, 165 



Perception of geotropic stimuli, 73, 74 



Perceptive zones, in phototropism, 128 

 in tendrils, 23, 24 



Percival, on grafts, 322 



Pertz and Darwin, F., on alternating 

 stimulation, 79, 80 



Pfefler, on ascent of sap, 216 



on chlorophyl in darkness, 118 



on curves of absorption of light, 121 



on functions of cell-components, 222 



on relation of plants to iron, 219 



on sensory zone of roots, 78 



on fhermotropic movements of tulip, 



99, I°° 

 on transpiration, 204 

 on turgidity, 179, 180 

 on uses of various substances in 

 plants, 243 



