INDEX. 
279 
p. 
P^eonia Brownii, 187 
— papaveracea rubra, 116 
— tenuifolia plena, 116 
Passiflora onychina, 238 
Patersonia sapphirina, 257 
Pentstemon argutus, 142 ; culture and propaga- 
tion of, 272 
Pentstemon barbatum ; var. carneum, 89 
— gentianoides ; var., 214 
— speciosus, 171 ; treatment of, 172 
Peristeria stapelioides, 142 
Petunias treated as climbing plants, 253 
Phaius bicolor, 166 
_ Wallichii, 193 ; culture of, 194 
Phalocallis plumbea, 42 
Philadelphus Gordonianus, 138 
Philibertia grandiflora, cultivation of, 7 
Pimelea Hendersonii, 88 
— incana, 22, 71 
Pinus, the rarer soecies of, increased by grafting, 
94 
Pith, nature, position, and contraction of, 178 
Plantations, directions for disposing shrubs in, 
82 ; those formed for shelter usually inimical 
to plants, 204 
Plant-houses, comparison of ancient with modern, 
249 ; necessity for consulting the comfort of 
proprietors in, 254 
Platycodon grandiflorus, 166 
Platystemon leiocarpum, 211 
Pleasure grounds, greenhouse climbing plants as 
summer ornaments to, 172 
Poles recommended for supporting roses and 
other hardy climbing plants, 13 
Polygonum amplexicaule, 186 
Pores, nature and offices of vegetable, 85 
Potentilla Hopwoodiana, 149 
Potting plants, proper season for, 71 
Primula sinensis; var. plena, 262 
Propagation of all kinds of plants by cuttings, 
best time for the, 72, 144 ; general directions 
for the, 192 
Protection of plants, rules to be observed in 
the, 108 
Q. 
Quekettia microscopica, 23 
R. 
Radiation, its nature, causes, laws, and effects, 
108 ; most copious and injurious in the spring 
months, 23 ; best means of checking, 24 ; 
capacity for, in different substances, 36 
Rays of the sun, different descriptions of, 11 
Reading, excellent method of, 208 
Repose of plants, a periodical one necessary, 
105 ; conditions to be observed during its 
continuance, 106 ; caused by climate, 105 
Repose requisite for orchidacese, nature of the, 
50, 157 ; proper period of, 107 
Reproductive power of plants increased in pro- 
portion to the elevation of temperature, 84 
Rhododendrons propagated by" grafting, 93 
Rodriguezia crispa, 238 
Roella elegans, management of 27 
Roofs of plant-houses, a covering of garden 
mats over them in winter economises heat, 23 
Roots, advantages of reducing those of some 
plants, 156 
Roses, suggestions for budding, 192 ; training 
the climbing species to poles, 13 ; soil and 
situation best suited to the climbing sorts, 15 
Rubus, many species of, interesting when trained 
to poles, 16 
Rudbeckia Drummondii, 51 
Rudiments of plants, inquiry into their organ- 
ization, 58, 153 
Ruellia ciliatrifiora, 90 
Rustic baskets for the pleasure grounds, 161 
S. 
Saccharine matters generated by heat, 159 
Saccolabium bifidum, 262 
— calceolare, 97 ; culture of, 98 
— papillosum, 214, 239 
Sacred bean, yellow-flowered, 233 
Salvia confertiflora, 114, 166 
— linarioides, 191 
— patens, 1 ; treatment of, 2 
Sap vessels, Mr. T. A. Knight's opinion respect- 
ing, 9 
Schomburgkia marginata, 139 
Scilla pratensis, 258 
Seeds, much more easily and safely transportable 
from foreign countries than plants, 61 ; heat 
essential to elaborate and mature them, 192 ; 
their production beneficial to strong plants, 
34 ; but injurious to weakly ones, 157 ; those 
most prolific which are obtained from very 
fertile plants, 134 ; plants raised from seeds 
are always more or less hardy or tender ac- 
cording to the climate in which these are 
ripened, 158 
Senecio cruentus, 42 
Shelter, directions for the efficient employment 
of, 108 ; that of a permanent description inap- 
propriate, 184 
Shrubberies, diversity of character necessary in, 
82 
Shrubs, advantages of planting them solitarily, 83 
Soap aloe, 235 
Soils, value of a chemical analysis of, 208 ; very 
slightly influential in promoting fertility, ex- 
cept as ready vehicles of nutritive fluids, 132 
Solanum jasminoides, 273 
Solar heat, its agency on vegetation, 33, 59, 84, 
107, 132, 155, 181, 204 
Solar light, its influence on plants, 10 
Sophronitis grandiflora, 42 
Sphenogyne speciosa, 77 
Spiral vessels in plants not conductors of fluids, 9 
Spring one of the most trying seasons for exotic 
plants, 239 
Stanhopea tigrina, 20 
Staking and supporting plants, importance of 
timely attention to, with directions for, 120 
