484 



INDEX. 



109; number of capsules, 315; 

 seeds, 358 ; prepotency of other 

 pollen, 398 



Papillaj 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 



Passifloracete, 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 coccinem, 150 



multiflorus, 150 ; measurement, 



152; partially sterile, 168, 360; 

 crossed and self-fertilised, 276 ; 

 enrJy 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 



Polemoniacex, 182 



Pollen, relative fertility of flowers 

 crossed from a distinct plant, or 

 with their own, 320 ; difference 

 of results in Xolana 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 

 grai'is in Dandelion and Pseony, 

 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 

 anemopliilous plants, 407 



Polyanthus, prepotency over cows- 

 lip, 397-8 



Polygoneas, 228 



Posoqueriafragrans, 5, 393 



Potato, 389 



Poterium sanguisorba, 410 



Potts, heads of Anthornis melanura 

 covered with pollen, 371 



Primrose, Chinese, 225 



Primula elatior, 425, 430 



grandiftora, 380 



mollis, 368 



officinalis, 380 



scotica, 3G2 



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, 

 397-398 



Primulacex, 215 



Pringlea, 410 



Proteacete of Australia, 415 



Prunus amum, 40 f 



laurycerasus, 405 



Pteris aquilina, 4(6 



