INDEX, 
Cli 
Polyanthus in herbaceous :border, 4 
wood, 284 
Polygonatum with foliaceous inflor- 
escence, xxxvi 
verticillatum, xxxv 
Polygonum Persicaria, attacked by 
turnip flea-beetle, 222 
Polypodium sinuosum, 220 
Polyporus Ellisianus, 236 
Schweinitzii, 237 
Polystichum, 285 
Poplar, durability of, 248 
white, 283 
wood leopard-moth in, 227 
Poppies, annual, tried at Wisley, 
1917, 483, cxiv 
perennial, tried at Wisley, lii, 
liii 
Welsh, double, 284 
Populus lasiocarpa fruiting, xxxvi 
sp. sensitiveness to frost, 557 
Potash from kelp, 561 
in soils, 244, 575 
manures, 521 
Potassium cyanide^ its effect on plants, 
238 
Potato black-leg, 567, 568, xcviii 
" Potato Book, The," by J. C. News- 
ham, reviewed, 539 
Potato Botrytis disease, 570 
cultivation, 11, 571 
degenerate strains of, 239 
diseases, 239, 569-571 
dry-rot, 568 
eelworm, 566 
' Ever- Ready,' cix 
experiments, 114, xxxix 
leak, 571 
Phoma tuberosa on, 238 
planting of cut tubers, 123 
of dressed cut tubers, 125 
of greened and sprouted 
tubers, 125 
of tubers of different 
sizes, 126 
effect of different spacing, 
127 
effect of date of plant- 
ing, 128 
Rhizoctonia disease of, 569, 
570. 572 
scab and sulphur, 238 
seed, 238 
Spongospora subterannea on, 
238 
spraying, :57c 571, xxxvi 
trial, a standardized, 130 
trials of main crop, 135 
of wart-resistant, 114, cxi 
tuber rot, 239 
wart disease, 114 
weight of seed, 239 
' Western Hero,' cix 
wilt, 239, 570 
Potatos attacked by Bibio, 549 
damaged by hail, xcviii 
on bracken land, 189 
JPoterium obtusatum var. hakusanense, 
xcv 
Poterium tenuifolium album, xcviii 
Poultry manure, analysis, 521 
Preservation of crops from injury by 
frost, 334 
Prickly pear, attempts at destruction, 
57i 
Primrose, double lilac, 285 
Primula Beesiana, 287 
Bulleyana, 287 
conica, 581 
' Eureka,' A.M., lvi 
strain, A.M., cxxi 
' Farrer No. 21,' xlviii 
helodoxa, 287, 581 
Littoniana, 287 
Loczii, xxxii 
malacoides, 2, 571 
alba plena, A.M., xlii 
' King Albert,' xliii 
sport, xli 
membranifolia, 581 
nutans, 581 
obconica x sinensis alleged 
cross, xlvi 
pulchella, 581 
pulverulenta, 283, 287 
' Mrs. Berkeley,' 287 
rosea, 283 
secundifiora, 581 
sikkimensis, 284, 287 
sinopurpurea, A.M., 239, xlvi 
spicata, 581 
stenocalyx, xxxii 
vincaefLora, 287, 581 
vittata, 581 
" Principles of plant teratology," by 
W. C. Worsdell, reviewed, 190 
Privet, stock for olives, 247 
wood leopard-moth in, 227 
" Productive Plant Husbandry," by 
K. C. Davis, reviewed, 534 
Prumnopitys elegans, 571 
Prunella grandiflora, xcviii 
Webbiana, xcviii 
Pruning, Lorette methods, 268, 26g 
" Pruning Manual, The," by L. H. 
Bailey, reviewed, 536 
Pruning, the Lorette system, 261 
Prunus communis, xxxiv 
early flowering, 555 
Pseudo-cerasus, 239 
galls upon, xxxi 
serrulata, 239 
spinosa macrocarpa, xxxiv 
parasitic on apple, xcviii 
variations in, xxxiv 
Pseudococcus casuarinae, 215 
nivalis, 215 
stolatus, 215 
Pseudomonas seminum, 567 
Pseudoripersia turgipes, 215 
Pseudotsuga taxifolia, 235 
Pteris Aquilina, its eradication, 221 
Puccinia graminis agrostis, 240 
avenae, 240 
phleipratensis, 240 
secalis, 240 
tritici, 240 
Pueraria Thunbergiana, 240 
