Cl PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY, 
Peas, late, at Wisley, 19 17, 516 
mid-season at Wisley, 19 16, 498 
poor soil, 567 
Peat, nitrogen in, 233 
Peas damaged by hail, xcviii 
Pecan cultivation, 233 
Pelargonium Endlicherianum, xcv 
Penicillium expansum, 546 
Pentstemon minidokanus, 250 
Murrayanus disease, 567 
payetensis, 250 
pubescens, disease, 567 
Pentstemons, 4 
Peppermint, 567 
Pergolas, 291, 292, 293 
Phleum pratense, 240 
Phlox subulata disease, 567 
' Thor,' cxvi 
Phoenix canariensis, transpiration in, 
566 
Pergolas, 291 
Permeability of plant membranes, 
233. 234, 238 
Pernettya, 3, 285 
Peronoplasmopara, 580 
Peroxidases, 234, 237 
Perry, A., on Delphiniums, 37 
Persimmon, American, 567 
Petunia ' Countess of Warwick,' xlvii 
Phaseolus multiflorus, 248 
Philadelphus microphyllus, 86 
' Virginal,' 86 
Philesia buxifolia, 86 
Phoma sp. on cedars, 550 
tuberosa on, 238 
Phoradendron sp. exhibited, xxviii { 
Phorbia brassicae, 211, 212 
cepetorum, 564 
Phosphates, 234 
Phygelius capensis, 88, 91 
Phyllachora Pastinacae, 566 
Phyllopertha horticola, 213 
Phyllosticta Narcissi, 57 
solitaria, 545 
Physalospora Cydoniae, 210, 545 
Phytophthora Arecae, 235 
Cactorum, 235 
erythroseptica, 235 
Faberi, 235 
Fagi, 235 
infestans, 235 
Jatrophae, 235 
Nicotianae, 235 
on tomato, 578 
parasitica, 235, 570 
Syringae, 235 
the genus, 235 
Picea ajanensis, 236 
alba, 236 
bicolor, 567 
canadensis, 246 
Englemanni, 235, 246 
excelsa, 557-9 
Maximowiczii, 545 
Morinda, 545 
nigra, 236 
obovata, 545 
Omorika, 236, 545 
orientalis, 236, 545 
Picea pungens glauca, 342 
sitchensis, 545, 558 
Pickering, S., on the action of one 
crop on another, 372 
Picrasma ailanthoides, xcv 
Pine beetle, 558 
bark beetle, 567 
cluster, durability of, 248 
Corsican," 216 
lodgepole, see Pinus contorta 
moth, 235 
rust, xxxv 
short leaf, 242 
western white pine, seed pro- 
duction in, 242 
Weymouth, 250 
Pinipestis zimmermanni, 235 
Pinus austriaca, 236, 557 
Cembra, 236 
contorta, 235 
Corsica, 557 
edulis, rust, 553 
insignis, 90 
Laricio, 216 
montana, 236 
Pinaster, 558 
ponderosa, 235, 236 
resinosa, 236 
Strobus, 235, 236, 558 
rust, xxxv, c 
sylvestris, 236, 248, 285, 557, 
558, 559 
entomology of, 241 
Pisum sativum, bacterial disease, 568 
Plagianthus Lyalli, 87 
Plagiobotrys folioceus, 250 
Harknessii, 250 
Plant disease and the vicious circle, 309 
Plantago major plumose, xcix 
Plantain lily, 284 
Plantations in Scotland, 236 
Plants &c. presented to garden, 19 17, 
5 2 5 
" Plants Poisonous to Stock," by 
H. C. Long, reviewed, 198 
" Plants, Seeds, and Currents," by 
H. B. Guppy, reviewed, 190 
Plasmodiophora Brassicae, 552 
Plasmopora nivea, 566 
Plesiocoris rugicollis, 550 
Plum ' Belle de Louvain/ 27 
' Bush,' 27 
' Crofton Glory,' cv 
' Gisborne's,' 27 
' Jefferson Gage,' cv 
' Peach,' cv 
' Prune d'Agen,' for drying, 
222 
' Robe de Sergent,' for drying, 
222 
sterility, 569 
stocks, 247 
twin, c 
* Utility,' A.M., cv 
' Victor Christian,' A.M., cvii 
wood leopard-moth in, 227 
Plums, winter buds, 567 
Plutella maculipennis, 219 
Poison-bait for onion fly, 564 
