clxiv PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 



Phyllostachys nigra, 248, 249, 253 



violescens, 249 



viridi-glaucescens, 248 

 Phyllotreta armoraciae, 145 

 Physoderma Zeae maydis, 406 

 Phytophthora infestans, 420 

 Pickering, S. U., see The Duke of 



Bedford 

 Pieris brassicae, 145 

 Pine blister rust, 407 

 Pink ' Model,' A.M., cvi 



' Queen Mary,' A.M., cvi 

 Pinus insignis, 250, 251, 254 



ponderosa, 183 



sp. damaged by heat, 399 



Strobus rust, 396 



sylvestris, 254 

 Pipes for deep-rooting plants, 105 

 " Planting, Cultivation, and Expres- 

 sion of Coconuts," by H. O. .New- 

 land, reviewed, 380 

 Plasmodiophora brassicae, 407 

 Plum ' Czar,' 66 



' Greengage,' 66 



' Jefferson,' 66 



' Jewson Marvellous,' ci 



' Langley Bullace,' 66 



' Laxton's Gage,' A.M., xcix 



' Purple Egg,' 66 



' Rivers' Early,' 66 



shot-borer, 413 



silver-leaf, 68, xciii 



sterility, 408 



Veitch's ' Black Bullace,' 66 

 ' Victoria,' 66, 68 



seedlings of, xevi 

 weather effect upon, 408 

 Plums for market, 66 



for private gardens, 66 

 Podosphaera leucotricha, 391 

 Poisonous spines of Hemileuca, 

 149 



Pollination in orchards, 77, 408 



of mango, 408 



of tomatos, 420 



of vanilla, 421 

 Polyanthus ' Codsall Strain,' cvi 

 Polygonum, 249 



sachaliense, 248 

 Polystachya Pobeguinii, 149 

 Pongamia glabra, 111 

 Popcorn, 408 

 Poplar gall, 406 

 Poppies, 248 



perennial, at Wisley, 191 7, 120 

 awards to, 120 

 Poppy ' Baker's Sunbeam Strain,' 



A.M., cix 

 Populus lasiocarpa monoecious, xc 

 Porcupines damage plants, III 

 Porthesia similis, parasites, 145 

 Portugal Laurel, silver leaf, xciii 

 Potash in minerals, 408 



with gypsum, 409 

 Potato blackheart, 409 



cultivation, 149, 409 



disease, its propagation, xxxiii 



diseases, 409, 410 



forcing, 409 



Potato Fusarium diseases, 409 

 leaf-roll, 410 

 mosaic disease, 410 

 spraying, 150 

 stem-borer, 421 



diseases, 410 

 storage, 150 

 wart disease, 301 

 wilt, 154 



Potatos, early, at Wisley, 191 9, 360 

 Potentilla eriocarpa var. cathayana, 

 393 



"Preparation of Substances Important 

 in Agriculture," by C. A. Peters, 

 reviewed, 134 

 Primula acaulis, xlii 

 anisodora, 150 

 Auricula Obristii, A.M., civ 

 cashmeriana proliferous, xcii 

 Cooperi, A.M., cvi 

 Harroviana, A.M., cvii 

 Juliae, xxxii 

 Juliana, xxxix 



hybrids, xxxii, xlii 

 leucophylla, xxxii 

 Littoniana malformed, xci 

 malacoides ' The President,' 

 A.M., xxxix 



' Princess Patricia,' 

 A.M., xli 

 nivalis, 150 

 pulverulenta, xci 

 sino-mollis, 150 

 sinopurpurea, 150 

 sylvicola, 150 

 variabilis wild, xxxiii 

 ' Wanda,' A.M., xlii 

 " Principles and Practice of Pruning, 

 The," by M. G. Kains, reviewed, 

 376 



Pritzel's Index, 14, xxxii 



" Problems of Fertilisation," by 



F. R. Lillie, reviewed, 375 

 " Profitable Herb Growing and 



Collecting," by A. B. Teetgen, 



reviewed, 377 

 Prosopis juliflora, no, in 



spicigera, 112 

 Prostanthera lasianthos, 255 

 Pruning investigations, 410 

 Prunus latidentata var. trichostoma, 



393 

 Pad us, xci 

 Pseudomonas caudatus, 414, 415 

 citri, 394 



fiuorescens, 414, 415 

 radicicola, 153 

 Psylla pyricola, 401 

 Pteridophyllum racemosum, 150 

 Pumpkin enemies, 402 

 Punica Granatum, 112 

 Punnett. R. C, ' Mendelism,' 377 

 Pyracantha crenulata, 404 

 obtusata, 410 

 yunnanensis, 410 

 Gibbsii, xxxix 



yunnanensis, 410 

 Rogersiana f. aurantiaca, A.M., 

 cxiv 



