INDEX. 



HABLITZIA, 172. 



Haguin cm fertilising Lilies, no. 



Half-bred bigeneric hybrids, 135. 



Half-bred plants, 136. 



Half breeds, grafts, &c., 136. 



Hamilodendfon, grafting, &e., 582. 



Hartson on pollen influence, 105. 



Haws, when to sow, 591. 



Hawthorns as stocks, &c. , 469 ; for Pyra- 



cantha, 60. 

 Hazel family, 270. 

 Heart's-ease, 146. 

 Heat an essential to germination, 33; in 



relation to fecundating Aroids, 193 ; 



latent, and hybridity, 151. 

 Heath family, 284. 

 Heckel on seed growth, 32. 

 Hedera, increase of variegated, 581. 

 Heliotrope family, 283. 

 Heliotropium Volterrce (H. Voltairianum, 



Hort.), 283. 



(This variety was raised from seed in 



1845 by a M. Lemaire, gardener to 

 the Countess of Boigne, at Chatenay, 

 the birthplace of Voltaire ; hence 

 the dedication to the great author. 

 It was sent out by Thibaut in 



1846 or 1847.) 



Hellebores, colour of, 541 ; hybrid, 516 ; 

 root increase of, 590. 



Helleborus, 516. 



Hemp family, 228. 



Hemsley on Fuchsia hybrids, &c., 409. 



Henderson on Rose variations, 99. 



Henon on wild hybrid Narcissus, 181. 



Henslow on hybrid Digitalis, 102. 



Herbaceous grafting, 66. 



Herbert on cross-bred Conifers, 259; on 

 cross - fertilisation and fertility, 101 ; 

 on crossing Heaths, 289 ; on cultivated 

 Roses, 502; on elective affinity, 120; 

 on hybrid Alstrcemerias, &c., 130; on 

 hybrid Cereus, 222 ; on hybrid Crinums, 

 176, 177 ; on hybrid Gladioli, 350 ; on 

 hybrid Pelargonia, 324 ; on hybrid 

 Narcissus, 182; on hybrid Rhododen- 

 dra, 121. 



(The late Dean on Hybridisation among 

 vegetables see ' Jour. Royal. Hort. 

 Society ' (1847), vol. ii. pp. 1-81.) 



Herbert on hybridism, 91 ; mixed pollen 

 of, 128; on mixed pollen, &c., 133; on 

 old pollen, 107 ; on permanence of 

 varieties from seed, 387 ; on prepotence, 

 121 ; on Nerines, 186 ; on seedling 

 Camellias, 551. 



Hermaphrodite flowers, emasculation of, 

 no, in ; plants those which bear male 

 and female organs, or stamens and pis- 

 tils, in the same flower. 15 ; plants, 

 some practically monoecious, 100. 



Hexacentris, 168. 



Hibberd on propagation of Roses, 501. 



Hibiscus, 389 ; pahistri-speciosus, 132. 



Hildebrand on direct pollen influence, 

 104. 



Hillock layering, 41. 



Hill on variability of grafted Pears, 63. 



Hippeastrums, cross-fertilisation in, 101 ; 

 hybrid, 178. 



Hogg on cross-fertilised Pear-fruits, 104. 



Hollies, budding of, 189. 



Holly family, 189 ; graft variegation in, 



62. 



Hollyhock family, 385. 

 Honeysuckle family, 229. 

 Hooker on hybrid Veronicas, 537. 

 Hop family, 228. 

 Hop-plant, monoecious, 228. 

 Horner on Auricula fertilisation, 454. 

 Horse-chestnuts, stocks for, &c. , 524. 

 House-leek family, 272; wild hybrid of, 



276. 



Houses, propagating, 17 ; for plant pro- 

 pagation, temperature and dimensions 

 of, 17. 



Hoya family, 194 ; nectarine mucus of, 

 114; nectar of, 196; propagation and 

 fruiting of, 195. 

 Humboldt on seed growth, 32. 

 Humulus lupulus, 228. 

 Hyacinths, 368 ; colours of crossed, 123 ; 

 propagation of, 369. 



(M. Barleman, of the Berlin University 



Garden, has propagated Hyacinths 



successfully by inserting the entire 



leaves in a shallow pan of sandy 



soil as cuttings. Placed in a warm 



frame or greenhouse, near the light, 



they will begin to form little bulbs 



at the base in about a fortnight. 



The leaves should be removed 



directly after flowering; and in this 



way it is possible to augment the 



stock obtainable by cutting up the 



bulbs in the usual manner). 



Hybrid Gesnerads, 122. 



Hybridisation, object and results of, 92 ; 



of monoecious and dioecious plants 



desirable, 15. 



Hybridising experiments^ how to perform, 



117; care necessary in, 117. 

 Hybridism a proof of affinity, 101 ; definite 

 results of, 93 ; general remaks on, 87 ; 

 graft in Potato, 547 ; natural, 6 ; and 

 climate, 151 ; and colour, 122. 

 Hybridity and colour, 540 ; artificial, 148 ; 

 complicated nature of, 136 ; Herbert on, 

 133; opinions on, 157; suggestions on, 

 1 66. 



Hybrids, fertile pollen of, 97 ; increased 

 size and vigour in, 89 ; sterile, or mules, 

 102 ; variability of, 158 ; wild, 7 ; bigen- 

 eric, 135 ; fertile, 98 ; graft, 60, 136 ; on 

 recording, &c., 135 ; reciprocal or in- 

 termediate, 154 ; spontaneously pro- 

 duced by cultivated species, 135. 

 (Catalogues of the seeds and plants 

 grown in M. Thurct's garden at 

 Antibes were carefully compiled ; 

 and, thanks to the care with which 

 these lists were prepared, M. 

 Thuret, and his aide-de-camp M. 

 Bornet, were often enabled to note 

 the production of spontaneous hy- 

 brids between various species of 

 Pittosporum, Polygala. Callistemon, 

 Passiflora, Acacia, Stapelia, Ar- 

 meria, Statice, Narcissus, Aloe, 

 Scilla, &c. The underwood was 

 composed of Cistuses. These C'is- 

 tuses, several thousands in number, 

 were the result of artificial fertil- 

 isation. All the forms figured in 



