CCXXXviii PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 
Pinus ponderosa, 524 
Strobus rust, 523 
sylvestris, 199 
canker, 200 
Pittosporum Colensoi, 202 
Plagiospermum sinense, 103 
Plant diseases due to fungi, the control 
of, 13, 317, 489, 501 
transportation, 522 
Plantago, coloration of roots, xlii 
lanceolata in London, cxxix 
tall form, cxxxix 
major in London, cxxix 
Planting fruit-trees, 200 
pot-bound trees, 201 
" Plants in Health and Disease," by 
F. E. Weiss, A. D. Imms, and W. 
Robinson, reviewed, 450 
Plasmodiophora Brassicae, 16, 18, 317, 
321 
Plasmopara Halstedii, 200 
pygmaea, 200 
viticola, 200, 503 
Platyclinis filiformis, clxxxix 
Platyornus lividigaster, 188 
Platyptilia pusillidactyla, 188 
Plectranthus sp. in Yunnan, 44 
Pleione Delavayi, 32, 40 
Forrestii, 40 
grandiflora, 40 
humilis vars., lxv 
Roylei, 89 
sp., 47, 89 
Pleospora sp. on apple, 17 
Pleurogyne carinthiaca, 112 
Pleurotus nidiformis, 493 
Plowrightia morbosa, 492 
Plum bud moth, 189 
brown rot, varietal resistance, 
201 
diseases, 500 
' Early Laxton,' A.M., cxlvi 
' Late Muscatelle,' 201 
' Orpington Prolific,' cli 
silver-leaf disease, cxxxvii 
Plums derived from American species, 
201 
Poa alpina, 280 
annua, cxxix 
compressa polynoda, cxxix 
pratensis, 487, cxxix 
trivialis, cxxix 
Podocarpus, cxxxvi 
Podosphaera leutotricha, 500 
Oxyacanthae, 500 
Poinciana regia, yellow-flowered, xli 
Poisoning trees, 201 
Poke-root, see Phytolacca decandra 
Pokeweed, see Phytolacca decandra 
Polemonium coeruleum fasciated, xlv 
tanguticum, 90 
sp. in Kansu, 90 
Pollen-grain germination, 503 
Pollination, 503 
of pomaceous fruits, 503 
Polygala Senega, 490 
Polygonatum roseum, 90 
sp. in Kansu, 90 
Polygonum amphibium, 491 
Polygonum bistorta, cxxvii 
vaccinifolium, 277 
Polyporus admirabilis, 477 
betulinus — a large specimen, 
cxxxvii 
sp. attacking timber, 318 
vaporarius, 490 
Polystichum angulare divisilobum 
plumosum, Perry's No. 1, A.M., 
clxvi 
Lonchitis, 280 
Poplar borer, 201 
Poplars, new, 202 
Populus Baileyana, 202 
balsamifera, 202 
Michauxii, 202 
deltoidea monilifera, 202 
Jackii, 202 
lasiocarpa, 36 
tremuloides, 487 
Potato ' Arran Chief,' cxlix 
black-rot, 504, 508 
canker, 18, 202 
collar-rot, 24 
composition of diseased, 507 
' Cropper,' cxlix 
disease, 14-16, 22, 202, 317, 
502, 504 
' Donside Defiance,' cxlix 
' Drumwhindle,' cxlix 
dry-rot, 504, 508 
Fusarium attack on, 504, 508, 
cxxvi 
' Idaho Rural,' 504 
' Irish Chieftain,' cxlix 
' King Edward,' cxlix 
' Langworthy,' cl 
leaf- roll, 505 
leak disease, 506 
' Pearl,' 504 
' Prolific,' cl 
rest period, 507 
Rhizoctonia disease, 192, 507 
' Rob Roy,' cxlix 
scab, 202, 481, 508 
silver scurf, 506 
spraying, 202, 507 
' Superlative,' cl 
' The Chapman,' cl 
' The Factor,' cl 
' The Provost,' cl 
tumour, 18 
value of immature, as seed, 508 
Verticillium disease, 507 
' White City,' cl 
wilt, 508 
Potatos, use of clean seed, 508 
Pot-bound plants, planting, 202 
Potentilla biflora, 91 
Clusiana, 91 
davurica, 90 
Veitchii, 509 
fruticosa, 90, 330 
nitida, 91 
Purdomii, 340 
Veitchii, 90 
verna, 91 
Poterium hakusanense, cxxxv 
obtusum, cxxxv 
