INDEX 
PrEFFER, on water-culture, 185 3; 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 
Pinguicula, 191 
Pitcher-plants, see 
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 
Porlieria, 391 
Positive pressure of gases in inter- 
cellular reservoirs, 117 
Potamogeton, 31 
Potassium, in ash, 129, 136, 175; 
condition of, in soil, 186 ; 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- 
Insectivorous 
457 
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 
Prunus, 87, 253 
Prussic acid, 238, 253 
Pseudopodia of Myxomycetes, 4, 346 
Pulvinus, 62, 355, 374, 389 
Pythium, 424 
Radiation, 278, 324 
Raffinose, 233 
Rafflesia, 2038 
Raphides, 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 
anaérobic, 300 
Respiratory quotient, 291 
Rhamnase, 248, 254 
Rhamnus, 254 
Rhodophycee, 424, 427 
Rhythm, of root-pressure, 83 ; 
nature of, 352; affected by stimu- 
lation, 394; induced, 394 
Ricinus, 190, 236 
Ripening, 447 
Robinia, 62 
Root-huairs, 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 
Sacus, on theory of transport of 
water in wood, 79; on a method 
