INDEX. 
277 
Gasteria, ordinary culture of the genus, 251 
Gastrochilus pulcherrimus, 75 ; cultivation and 
increase of, 76 
Gastrolobium cordatum, 43 
Gelasine azurea, 41 ; almost hardy, 41 
Genista bracteolata, 89 
— monosperma, 143 
Gentiana acaulis, inhabits rocky districts, 154 
Gentiana gelida, 5 ; superior beauty and ma- 
nagement of, 6 
Gentiana Pneumonanthe, found in moist heathy 
places, 154 
Gentiana, general treatment of the genus, 153 
Geraniums improperly confounded with Pelargo- 
niums, 33 
Gesneria cochlearis, 66 
— ^ mollis, 186 
Gladiolus insignis, 224 ; treatment of, 225 
Gladiolus, benefits conferred on the species by 
planting them in the open ground in summer, 
224 
Glass for the roofs of plant-structures, descrip- 
tion of that used at Chatsworth, 253 
Gloxinia rubra, 188, 271; origin and culture 
of, 272 
Gompholobium Drummondii, 188 
— tenue, 166 
Gonolobus hispidus, 66 
Grafting, principles of, 202 ; objects to be 
attained by it, 203 ; applicability of the prac- 
tice to most hard-wooded exotics, 205 ; most 
. approved routine, 203 ; new kind of hand- 
glass suitable for the purpose, 203; clay or 
wax easily dispensed with, 204 
Grasses, external characteristics of, 39 
Greenhouse plants, common management of, 
24, 47, 71, 96, 120, 144, 168, 192, 216, 239, 
264 
Grevillea dubia, 115 
— longifolia, 93 
Guelder roses, should not have their young 
shoots pruned, 23 
H. 
Half-hardy plants, suggestions for propagat- 
ing, 72, 167, 191 ; period for transplanting, 
95 
Hardenbergia digitata, 235 
Hardy herbaceous plants, errors in trimming, 
48 ; directions for separating and shifting, 
48, 150 
Hardy shrubs, season for pruning and propa- 
gating, 72, 167, 191 
Haworthia, cultivation of the genus, 251 
Heat, generated by all living things, 81; ab- 
stracted by winds, 81 ; dispersed in the 
process of evaporation, 82 ; its connexion 
with fluids, 82 ; manner in which it escapes 
during evaporation, 82 ; its radiation and 
conduction, 131 ; laws which govern its 
transition, 131 ; that of an artificial kind 
inimical to the hardihood of seeds ripened or 
plants gei'minated therein, 136 ; way of testing 
the last circumstance, 137 
Heath, Banks's, 243 ; Mr. Macnab's, 125 
Heaths, great attention now bestowed on, 125, 
243; proper situation for placing them in, 
244 ; Mr. Mac Nab's treatise on them recom- 
mended, 126 
Heath-soil, considerations on, 249 
Hedychium aurantiacum, 213 
Helichrysum robustum, 188 
Hermaphrodite flowers, their nature, 232 
Hibiscus multifidus, 103 ; remarks on the 
management of, 104 
Hilum, its form noted, 258 
Hippeastrum anomalum, 69 
Horticulture, its claims to be considered a 
science, 129 
Hotiea barbata, 211 
Hovea villosa, 69 
Hoy a coriacea, hints respecting the culture of, 21 
Humidity, when accompanied by a sufficient heat, 
grateful to the human feelings and to plants, 120 
Humus, general nature and properties of, 10, 57 
Hyacinths, principal features in the culture of, 
24, 240 
Hybridization, good consequences of, 79 ; obser- 
vations on extending the practice to annuals, 
143 
Hybrid plants, injudiciousness of applying names 
to them unless they are distinct, 3 ; common- 
ly require much pruning, 11 ; readily obtained 
between species of allied genera, 51 ; justness 
of allowing the gardeners who raise them 
part of the profits derived from their sale, 196 
Hymenoxys californica, 235 
L 
Illustration, highly useful in botanical pur 
suits, 36 
Impatiens glanduligera, 90, 214 
— macrochila, 41 
— tricornis, 42 
Indusium, difference between the part so called 
by Mr. Main, and that of the majority of 
botanists, 257 
Inflorescence, various forms of, 119, 161 
Ipomsea longifolia, 90 
Iris fragrans, 18 
— bicolor, 214 
Iron, its presence in soils made known by the 
action of fire, 251 
J. 
Jasminum multiflorum, 22 
Johnsonia hirta, 44 
K. 
KiEMPFERiA elegans, 189 
Kennedya, new species of, 93 
Kennedya pannosa, 1 7 
— Stirlingii, 69 
L. 
L^LiA albida, 189 
— cinnabarina, 94, 193; history and culture 
of, 194 
Ljelia purpurascens, 214 
