INDEX 



467 



Paraheliotropism, 370 



Parapectine, 47 



Parasites, 127, 347 



Parasitism, 191, 196, 205 



Paratonic influence of light, 367 



Parnassia, 452 



Parthenogenesis, 459 



Passiflora, 394, 407 



Pectase, 254, 257 



Pectic acid, 47 ; relation to middle 

 lamella, 51 



Pectine, 46 



Pectose, 46 



Pediastrum, 12 



Pelvetia, 22 



Pennisetum, 32, 33 



Peptase, 254, 257 



Peptone, 168 



Perception, 415 



Periodicity of root-pressure, 92, 364 



Perisperm, 444 



PFEFFER, on water-culture, 172 ; on 

 localisation of sensitiveness, 391 



Phajus, 237 



Phalaris, 386, 407, 409 



Phosphorus, in proteins, 135, 180 ; 

 mode of absorption of, 141 ; asso- 

 ciated with nucleus, 182 



Photo-epinasty, 371 



Photosynthesis, 155 ; theories of, 

 156 ; not carried out by fungi, 

 164 



Phototaxis, 388 



Phototonus, 366 



Phytol, 150 



Pinguicula, 197 



Pitcher-plants, see Insectivorous 

 plants 



Pitchers, 195 



Planogametes, 431 



Plantago, 452 



Plasmodium of Myxomycetes, 4, 10, 

 354 



Plasmolysis, 64 



Plastids, 5 



Polar nuclei, 441 



Pollen- grain, germination of, 454 



Pollen-tube, 442, 446 



Pollination, 448 ; methods of, 449 



Polyembryony, 447 



Polygamous plants, 452 



Polygonum, photo-epinasty of, 371 



Polymerisation of aldehydes, 158 



Polytrichum, 31 



Porlieria, 400 



Positive pressure of gases in inter- 

 cellular reservoirs, 121 



Potamogeton, 36 



Potassium, in ash, 135, 141, 180 ; 

 condition of, in soil, 141 ; mode of 

 absorption of, 183 ; function of, 

 185 



Potometer, 103 



Predominant form of plants in 

 different groups, 437 



Prepotency, 453 



Primula, 275 



Procarpium, 433 



Protandry, 451 



Proteins, 165 ; composition of, 166 ; 

 crystals of, 166 ; reactions of, 166 ; 

 coagulated, 167 ; construction of, 

 169 ; translation of, 221, 224 ; 

 storage of 222 



Proteoclastic enzymes, 254, 257 



Proteoses, 168 



Protococcus, 9 



Protogyny, 452 



Protoplasm, composition of, 6; 

 movements of 6, 349 ; properties 

 of, 12 ; continuity of, through 

 cell- walls, 15, 413 ; regulation of 

 osmosis by, 65, 107 ; relation of, 

 to respiration, 299 ; nutritive 

 substances for, 127 ; fermenta- 

 tive activity of, 250, 261, 308 ; 

 permeabilitv of, by water, 359, 

 412 



Protoplasts, structure of, 2 ; arrange- 

 ment of, in multicellular plants, 3 



Prunus, 92, 259 



Prussic acid, 245, 259 



Pseudomonas, 204 



Pseudopodia of Myxomycetes. 4, 

 354 



Pulvinus, 67, 362, 382, 399 



Pythium, 433 



Radiation, 284, 330 



Raffinose, 239 



Rafllesia, 209 



Raphides, 279 



Rectipetality, 324 



Reductases, 261, 266 



Reflex action, 415 



Rennet, 254, 259 



Reproduction, 420 ; relation to 



growth, 421 ; vegetative. 426 ; 



asexual, 427 ; sexual, 430 

 Reserve materials, 227 

 Reservoirs, of air, 113; of food, 130, 



228 

 Resin, 275 



