INDEX 



457 



PFEFFER, on water-culture, 185 ; on 

 localisation of sensitiveness, 382 



Phajus, 231 



Phalaris, 378, 398, 400 



Phosphorus, in proteins, 129, 175 ; 

 mode of absorption of, 136 ; asso- 

 ciated with nucleus, 177 



Photo-epinasty, 363 



Photosynthesis, 150 ; theories of, 

 151 ; not carried out by fungi, 159 



Phototaxis, 379 



Phototonus, 358 



Pinguictila, 191 



Pitcher-plants, see Insectivorous 

 plants 



Planogametes, 422 



Plantago, 442 



Plasmatic membranes, 6, 57, 59 



Plasmodium of Myxomycetes, 4, 9, 346 



Plasmolysis, 59 



Plastids, 5 



Polar nuclei, 432 



Pollen grain, germination of, 444 



Pollen tube, 433, 437 



Pollination, 438'; methods of, 439 



Polyembryony, 437 



Polygamous plants, 442 



Polygonum, photo-epinasty of, 363 



Polymerisation of aldehydes, 152 



Polytrichum, 26 



P&rlieria, 391 



Positive pressure of gases in inter- 

 cellular reservoirs, 117 



Potamogeton, 31 



Potassium, in ash, 129, 136, 175 ; 

 condition of, in soil, 136 ; mode of 

 absorption of, 177 ; function of, 179 



Potometer, 97 



Predominant form of plants in 

 different groups, 428 



Prepotency, 443 



Primula, 269 



Procarpium, 424 



Protandry, 441 



Proteins, 160 ; composition of, 161 ; 

 crystals of, 161 ; reactions of, 161 ; 

 coagulated, 162 ; construction of, 

 164 ; translocation of, 215, 218 ; 

 storage of, 216 



Proteoclastic enzymes, 248, 251 



Proteoses, 163 



Protococcus, 9 



Protogyny, 442 



Protoplasm, composition of, 6 ; 

 movements of, 6, 349 ; properties 

 of, 12 ; continuity of, through 

 cell-walls, 15, 404; regulation of 

 osmosis by, 60, 101 ; relation of, 

 to respiration, 294 ; nutritive sub- 



stances for, 120 ; fermentative 

 activity of, 244, 256, 302 ; per- 

 meability of, by water, 351, 403 



Protoplasts, structure of, 2 ; arrange- 

 ment of, in multicellular plants, 3 



Prumts, 87, 253 



Prussic acid, 238, 253 



Pseudopodia of Myxomycetes, 4, 346 



Pulvinus, 62, 355, 374, 389 



Pythium, 424 



Kadiation, 278, 324 



Raffinose, 233 



Rafflesia, 203 



Eaphides, 273 



Rectipetality, 318 



Reductases, 259 



Reflex action, 405 



Rennet, 248, 253 



Reproduction, 411 ; relation to 

 growth, 412 ; vegetative, 417 ; 

 asexual, 418 ; sexual, 421 



Reserve materials, 221 



Reservoirs, of air, 106 ; of food, 138, 

 222 



Resin, 269 



Respiration, 289 ; gaseous inter- 

 changes of, 285 ; masked by photo- 

 synthesis, 286 ; loss of weight in- 

 volved in, 289 ; intensity of, 291 ; 

 nature of the process of, 293 ; 

 relation of, to metabolism, 294 ; 

 influence of external conditions 

 on, 296 ; of seeds, 297 ; a source 

 of energy, 298 ; intramolecular or 

 anaerobic, 300 



Respiratory quotient, 291 



Rhamnase, 248, 254 



Rhamnus, 254 



Rhodophycea, 424, 427 



Rhythm, of root-pressure, 83 ; 

 nature of, 352 ; affected by s-timu- 

 lation, 394 ; induced, 394 



Ricinus, 190, 236 



Ripening, 447 



Robinia, 62 



Root-hairs, 68 ; action of, 69 



Root-parasites, 200, 343 



Root-pressure, 71, 81, 82; rhythm 

 of, 83, 87 ; method of measuring, 

 84, 87 ; amount of, 85 ; perio- 

 dicity of, 87 



Rush, construction of stem of, 110 



Saccharomyces, see Yeast 

 SACHS, on theory of transport of 

 water in wood, 79 ; on a method 



