586 
Head-dresses, floral — instructions for 
making, 1, 651. 
Heat—expansion and closure of parts of a 
flower and the effect of heat, 1, 32; 
essential to plant nutrition, i, 41, 45; 
regulation of heat for flower production, 
i, 49; conveyance of heat, i, 216. 
Heaths —calendarial directions, i, 3, 4, 9, 17, 
18; hardy ornamental species, &c., de- 
script. and cult., i, 300; winter-bedding 
plants, i, 647; popular garden species, 
&c. (see Erica). 
Heating Glass-houses, &c., Modes of— 
Boilers (see that title). 
Fern house, 1, 583, 585. 
Flues—heating by, i, 216. 
Furnaces—(illust.), descript. and manage- 
ment, i, 277. 
Gas—use of, descript. of gas-stove, 1, 222. 
Greenhouse and conservatory—gas-stove 
for small house, illust. and descript., 
i, 222; temperature, warming appa- 
ratus for conservatory, 1, 524, 526. 
Hot water—heating by, i, 216; pipes, con- 
struction and length required for warm- 
ing buildings, 1, 216, 221. 
Length of piping required to obtain cer- 
tain temperatures, &c., 1, 221, 222. 
Orchid houses, i, 559, 560. 
Steam-—-use of and pipes for, i, 222. 
Stove or tropical house, i, 544, firing and 
air-giving, 1, 546. 
Vineries—hot-water pipes arrangement, i, 
206. 
Hedera—ornamental vars., &c., descript. 
and cult., i, 304; winter-bedding sorts, 
i, 647. 
Hedge bill—descript. and use of, i, 180 
Hedge mustard—descript. of, i, 391. 
Hedge shears—(illust.), descript. and use 
of, i, 178. 
Hedges—(see Fences and Hedges). 
Hedychium —calendarial directions, i, 6; 
descript. and cult. of hardy perennial 
plants, i, 361, of semi-aquatic species, 
1, 381, of greenhouse plants, 1, 536, of 
subtropical garden forms, i, 644. 
Hedysarum multijugum —descript. of, 
1, 304. 
Helenium —calendarial directions, a, 6; 
species, &c., descript. and cult., 1, 361; 
1, oS 
lol pumilum for summer- bedding, 1, 635. 
Helianthemum—calendarial directions, i, 
16; species, &c., descript. and cult., i 
304. 
Helianthus-— calendarial directions, i, 6, 13; 
perennial species, &c., descript. ‘and 
Cult.) 361: annual species, &c., de- 
script. and cult., i, 392, illust. of minia- 
ture form, 1, 301; H. tuberosus (illust.), 
descript., uses, and cult. as vegetable, 
ii, 449, 450. 
Helichrysum —descript. and cult. of H. 
monstrosum as an annual, i, 392; 
greenhouse sorts, descript. and cult., 
1, 530. 
Heliconia—descript. and cult. of, i, 55r. 
Heliotrope—calendarial directions, i, 2, 4, 
10, 12, 15; descript. and cult. as green- 
house and outdoor plants, i, 536; 
summer-bedding directions and forms, 
1, 633, 635. 
Heliotropium Peruvianum—as green- 
house and out-of-door plants, i, 536. 
(See also title Heliotrope.) 
CU Ter un pct &c., descript. and 
cult., 1, 392. 
Helix Rea eeewiot and treatment, 
1, 93. 
Helleborus — species, &c., descript. and 
cult., i, 361; H. niger—calendarial 
directions, 1, o1G, illust. and descript., 
i, 361, directions for forcing, 1, 625; 
spring-bedding plants, i, 630. 
Hemerocallis—species,&c., descript., cult., 
and illust. of, 1, 361. 
Hemionitis cordata, H. palmata—de- 
script. of ferns, i, 594. 
Hemitelia—species, &c., descript. of, i, 594. 
Hemlock spruce-tree—descript. of, i, 335. 
| Hibiscus — hardy 
Hemp —descript. and cult. in sub-tropical 
garden, 1, 643. 
Hepialus Humuli, H. lupulinus— 
(illust.), descript. and remedies, 1, 105, 
106. 
Heracleum — species, &c., descript. and 
cult., 1, 361. 
Herbaceous border—(see Perennials). 
Herbaceous grafting —explanations and 
illusts., 1, 241, 242. 
Herbaceous Plants— 
Forcing plants and bulbs—treatment and 
list of, i, 625-627. 
Perennials (see that title). 
Winter-bedding—use of hardy plants, 1, 
646. 
Herbs—drying process, ii, 356; packing, 
ii, 564. (See also names of herbs. ) 
Hermaphrodite flowers — descript. 
1, 49, 59- 
Herniaria glabra—descript. and cult., i, 
362, for carpet-bedding, i, 639. 
Hesperis matronalis fi. pl and forms 
of—descript. and cult., 1, 362. 
Heterodera radicicola—(illust.), descript. 
and remedies, i, 105. 
Heuchera—species, &c., descript. and cult., 
i, 362, for spring- bedding, 1, 630. 
Hexacentris (Thunbergia) mysorensis 
—(illust.), descript. and cult., 1, 551. 
Hibbertia—species, &c., descript. and cult., 
1, 536. 
of, 
ornamental shrub, H. 
africanus major, descript. of, i, 392; 
H. syriacus and vars., descript. of, i, 
304, for forcing, i, 622; stove species, 
&c., descript. and cult., i, 551. 
Hickory trees—descript. of, i, 294. 
Hidalgoa Wercklei—(illust.), descript. and 
Cult ass e0: 
Himalayan house at Kew — descript. 
and illust. of, 1, 210. 
Hippeastrum — descript., history, and 
illust. of species, &c., i, 447; cultural 
requirements and treatment of insect 
pests, i, 447, 448; lists of named hy- 
brids, seedlings, and best species, 1, 448. 
Hippophae rhamnoides — descript. and 
Cult.) 20K. 
Hirundo rustica, H. urbica—as garden 
friends, i, 118. 
Hoes—(illusts.), descript. and use of Canter- 
bury hoe, i, 174, of draw-hoes and 
thrust- hoes, 1, 175; 176, of Planet Jr. 
single-w heel hoe, 1, 176. 
Holly trees and Lig eae se ag 
directions, i, 8, ; transplanting time 
and mode, i, aie: * pruning, 1, 256; man- 
ure for, 1, 275; species, &c.—descript. 
and cult., i, 305, 306; winter-bedding 
vars., 1, 647. 
Hollyhock—calendarial directions, i, 8, 13, 
17, 20: descript., history, illust., cult., 
propagation, &c., 1, 449; fungus dis- 
ease, 1, 449; list of best vars.,-1, 450. 
Honesty—for spring-bedding, i, fap. 
Honey locust tree—descript. of, i, 303. 
Honeysuckle — species, &c., descript. of, 
1, 308. 
Hop—ornamental forms, descript. of, 1, 362; 
descript., uses, and cult. as a vegetable, 
ll, 446, foreign names of, ii, 527. 
Hop-hornbeam—descript of, i, 310. 
Hoplocampa fulvicornis— descript. and 
treatment, 1, 77. 
Hoplocampa testudinea — descript. and 
treatment, 1, 74- 
Hop-tree—descript. of, i, 314. 
Horehound —descript., uses, and cult., ii, 
446; foreign names of, ii, 527. 
Hornets—as garden friends, i, 120. 
Horns and hoofs—as manure, i, 158. 
Horse-dung—as manure, i, 161; nitrogen 
in, analyses table, ii, 464. 
Horse-radish—descript., illust., uses, cult., 
and insect pests, &c., ii, 446-448; for- 
eign names of, 11, 527; calendarial direc- 
tions, ll, 532, 535, 538, 556. 
Horsetail—descript. of plant, i, 385. 
THE GARDENER’S ASSISTANT. 
Horticultural tilths—range of, i, 140. 
Horticulture, evolution of—influence of 
hybridism, i, 58. 
Hose-pipes—(illust.), descript. and use of, 
1, 185, 186. 
Hot-water pipes—heating glass-houses, 
&c., by means of, i, 216, 221, temper- 
ature regulation, i, 222. 
Hoteia (Spirzea) japonica, &c. —retard- 
ing growth of, i, 628. 
Hothouses— 
Calendarial directions for management of, 
1, 2, 4, 5> 7> 9, TO, 12,:139 05 nnoeoe 19. 
Construction of—directions and illust., i, 
209, 210. 
[See also title Stove or Tropical House. ] 
Hottonia palustris—descript. of, i, 38r. 
Houlletia—descript. of orchids, i, 576. 
Hour-lines—table of the angles which the 
hour-lines form with the meridian for 
every half-degree of latitude, 11, 8. 
House-leek—descript. and cult. of, i, 374, 
for carpet-bedding, i, 640. 
Houstonia—species, &c., descript., cult., 
and illust. of, 1, 362. 
Houttuynia cordata—descript. of, i, 385. 
Hovea—species of, descript. and cult., i, 536. 
Howea-—descript. and cult. of palms, i, 611. 
Hoya—H. carnosa for greenhouse, i, 536; 
stove plants, descript. and cult., 1, 551. 
Humata—(see Davallia). 
Humea elegans-— descript. of plants, i, 537, 
for summer-bedding (illust.), i, 635. 
Humulus—descript. of H. Lupulus, i, 362, 
cult., uses, &c., as vegetable, 1, 446; 
H. japonicus, descript. and cult. of, 
1, 392. 
Humus or Vegetable Mould— 
Assimilable elements in one hectolitre of 
sifted leaf-mould — table showing 
weight of, i, 137. 
Descript. and formation of, i, 131, 136, 138. 
Direct absorption of humus of the soil by 
growing plant—question of, 1, 139. 
Elements not present in—means of apply- 
ing to the soil, 1, 137, 138. 
Importance of as a source of the nitrogen 
of crops, 1, 136. 
Influence of humus on capacity of soil for 
water, 1, 135. 
Kinds of leaf-mould—descript. of, i, 136, 
137. 
Plant-food—humus as a source of, i, 134. 
Retentive properties leaf-mould for 
manurial substances, 1, 137. 
Selected constituents in parts per 100 of 
mould—table showing amount of, 1, 137. 
[See also Soils, sub-heading Horticulture.] 
Hyacinth—calendarial directions, i, 3, 6, 14, 
17, 18, 19, 20; descript. and cult. of 
hardy perennial species, &c., 1, 362, 
of grape hyacinth (illust.), i, 366, of 
water hyacinth (illust.), 1, 383; forcing 
sorts and directions, i, 626; spring- 
bedding sorts and directions, i, 630; 
popular garden forms (see Hyacinthus 
orientalis). 
Hyacinthus—species, &c., descript. and 
cult., 1, 362. (See also titles Hyacinth, 
Hyacinthus orientalis. ) 
Hyacinthus orientalis—popular garden 
forms—descript., history, Dutch and 
English trade, 1, 450; propagation, 
cult. in beds, pots, glasses, i, 450-452; 
illusts. of single and double hyacinths 
and of bulb with offsets, 1, 450,451; 
list of best vars., 1, 452. 
Hyalopteris Pruni—descript. and treat- 
ment, i, 89. 
Hybernia defoliaria—(illust.), descript. 
and treatment, i, 87. 
Hybridization— 
Authors’ references to—history of experi- 
ments, &c., i, 58. 
Chief factors ‘a plant improvement, i, 59. 
Cross-breeding—course of procedure, i, 55. 
Cryptogamic or flowerless plants, i, 64. 
Difference between cross-fertilization and 
hybridization, i, 55. 
