484 



INDEX. 



PAPILLE. 



109 ; number of capsules, 315 ; 

 seeds, 358 ; prepotency of other 

 pollen, 398 



Papillae of the Viola tricolor at- 

 tractive to insects, 124 



Parsley, 172 



Passiflora alata, 330, 334 



gracilis, 171 ; measurements, 



171 ; crossed and self-fertilised 

 276; seeds, 323; self - fertile, 

 365 



Passifloraceie, 171, 357 



Pea, common, 160, 351 



Pelargonium zonale, 142 ; measure- 

 ments, 143 ; effects of inter- 

 crossing, 301 ; almost self-sterile, 

 359 



Pentstemon argutus, perforated co- 

 rolla, 429, 431, 436 



Petunia violacea, 188; measure- 

 ments, 189-203; weight of seed, 

 196 ; cross with fresh stock, 196- 

 201 ; relative fertility, 201-203 ; 

 colour, 203 ; summary of experi- 

 ments, 265, 274; superiority of 

 crossed over self-fertilised, 289 ; 

 early flowering, 293, 294 ; uniform 

 colour of self-fertilised, 309 ; 

 seeds, 316, 319, 323, 325; self- 

 sterile, 362 



Phalaris canariensis, 235 ; measure- 

 ments, 236, 237 ; early flowering 

 of crossed,, 293 



Phaseolus coccineus, 150 



multiflorus, 150; measurement, 



152; partially sterile, 168, 360 

 crossed and self-fertilised, 276 

 early flowering of crossed, 293 

 seeds, 316 ; perforated by humble- 

 bees, 433, 438 



Phaseolus vulgaris, 153; self-fertile, 

 168, 367 



Pisum sativum, 160 ; measurements, 

 162 ; seldom intercross, 169 ; 

 summary of experiments, 264, 

 278 ; self-fertile, 367 



Plants, crossed, greater consti- 

 tutional vigour, 285 



Plateau, M., on insects and arti- 

 ficial flowers, 374, 375 



Pleroma, 364 



PTERI3. 



Polemoniacex, 182 



Pollen, relative fertility of flowers 

 crossed from a distinct plant, or 

 with their own, 320 ; difference 

 of results in Nolana prostrata, 321 , 

 323 ; crossed and self-fertilised 

 plants, again crossed from a 

 distinct plant and their own pol- 

 len, 324 ; sterile with their own, 

 330-338 ; semi -self-sterile, 338- 

 340; loss of, 377; number of 

 grains in Dandelion and Paeony, 

 377 ; in Lolium perenne, Plantago 

 lanceolata, Scirpus lacustris, and 

 Wistaria sinensis, 378 ; number 

 necessary for fertilisation, 378 ; 

 transported from flower to flower, 

 379 ; prepotency, 393-401 ; abori- 

 ginally the sole attraction to in- 

 sects, 403 ; quantity produced by 

 anemophilous plants, 407 



Polvanthus, prepotency over cows- 

 lip, 397-8 



Polygonex, 228 



Posoqueria fragrans, 5, 393 



Potato, 389 



Poterium sanguisorba, 410 



Potts, heads of Anthornis taelanura 

 covered with pollen, 371 



Primrose, Chinese, 225 



Primula elatior, 425, 430 



grandiflora, 380 



mollis, 368 



officinalis, 380 



scotica, 362 



sinensis, 225, 279 ; measure- 

 ments, 227; early flowering of 

 crossed, 293, 296 " 



veris (,var. officinalis), 219 ; 



measurements, 221 ; result of 

 experiments, 267, 268 ; early 

 flowering of crossed, 293 ; seeds, 

 317; self-fertility, 351; prepo- 

 tency of dark red polyanthus. 

 397-39S 



Primulacex, 215 

 Pringlea, 410 



Proteacex of Australia, 415 

 Prunus avium, 4Cf 



laurocerasus, 405 



Pteris aquilina, 4(6 



