INDEX. A. ABSORPTION, force of, in spongelets, 17. Acetate of lime, solution of, rejected by roots, 19. introduction of heated, to plant compartments, 158. of plant-houses, ventilation a means of drying, 158. its connexion with the spongelets, 12. offices performed by it, 33. its importance, 34. its quantity proportionate to the number of buds, 194. Alburnous substance, 194. Ammonia employed to promote germination, 171. Amylaceous substance, 195. Annuals, oleraceous, 120. Annual rest of plants, 337. Aquatic plants, 118. necessity of maintaining a due degree of temperature in the Aqueous matter, necessity of its excess being decomposed in fruits Aqueous particles in plants, effects of their being frozen, 89. Atmosphere, temperature of, at various places, 94. unfavourable state of, a cause of sterility in flowers, 177. moisture, 128. Axil, 31. Axils of leaves, the situation where leaf-buds are formed, 31. B. Balloon training, 275. Bark, 29. its production, 25. its distinct parts, in trees and shrubs, 27. its anatomical relation to leaves, 38. of the root, its offices, 13. its absorbent property, 13. its rind and epidermis in some cases perform the office of Bell glasses, their use in propagation by cuttings, 213. of different colours, 215. Bleeding, 256. of vines, preventive against, 257. Blossom-buds, their identity with leaf-buds in the first stage of Bottom heat, 105. its effects different from those resulting from solar radi- its natural amount, 105. necessary for the flowering of many tropical plants, 111. degree of, communicated to plants in pots, from the atmosphere its variation agreeably to that of the soil of countries, 116. effects of their being subjected to a widely different temperature Budding, propagation by, 220. mode of operation, 223. Buds, the origin of branches, 16. not the origin of roots, 16. adventitious in roots, 22. embryo, 31. their relation to bulbs, 32. latent, 38. mature, preferable to immature for the purpose of propaga- tion, 243. Bulbs, in arid regions, 339. effect of scarring their centre, 220. C. Callus, 27. Calyx, its situation and colour, 56. its use, 68. Camellias, a method of propagating them, 250. Canker, 110. Cape heaths, drainage for, 289. Capillary tubes give hygrometrical force to tissue, 18. Carbon, excess of, in seeds, 8. its conversion into carbonic acid during the process of germina- tion, 8. a component of the food of plants, 20. proportions of, in certain vegetable secretions, 77. in seeds, 181, 182. 186. necessary to preserve their vitality, 186.' requires its proportion altered before germination can Carbonic acid, its formation during the process of germination, 9. its mode of introduction into the system of plants, 42. its decomposition in plants during the day, 43. its formation by plants during the night, 43. its digestion and decomposition in the system of plants, 43. conditions under which it is slowly formed, 168. formation of, in seeds, 187. decomposed, furnishes an essential part of the secretions of Carburetted hydrogen gas, 123. Cellular system, 231. horizontal, 297. Cellular tissue combined with woody fibre, 24. Charcoal, packing seeds in, 188. Chemical changes in seeds, 163. Cherries, forcing of, 112. Chinese mode of dwarfing trees, 263. Chlorine employed to promote germination, 172. Cicatrisation, 297. Circulation of sap, 33. Climate, uniform, 338. Climates, extreme, 338. INDEX. extreme, imitation of, 116. Climbers, 278. Colour of leaves influenced by light, 52. the natural green in plants, circumstances which prevent its being acquired, 84. 86. green, in plants, how produced, 86. yellow, in plants, cause of its occurrence, 86. Colouring matter, green, decomposed by frost, 88. Corolla, its nature, 56. Creepers, 278. Crops, change of, 283. Cross-breds, 69. are generally fertile, 69. Cross-breeding, 327. process of, 331. Cucumbers, advantage of growing them in forcing-houses, instead of pits, in winter, 159. Curl in potatoes, 74. Cuttings, propagation by, 204. conditions required in order to enable them to become young double pots employed in striking them, 212. D. Damping off, 152. Deciduous plants, 74. trees, season for transplanting, 296. Degeneracy, means of preventing it in seed crops, 318. Degeneration of varieties, 318. Deleterious matter thrown off by roots, 21. substances, when attenuated, are most likely to prove injurious to plants, 19. Dew-point, 130. Digestion, a function of the leaves, 42. Diurnal rest of plants, 347. Drainage, 123. of pots for plants, 124. 289. of soil in pots by fragments of absorbent stone, 290. Dryness, atmospheric, table of, with regard to the direction of the causes of, in hothouses, 146, 147. Double composite flowers, 338. Double Dahlias not truly double flowers, 338. Double flowers, 338. conditions under which they may and may not produce seed, 179. Double Stocks, 336. for plants, 288. Dung-heat, Grapes and Nectarines forced by it, 149. E. Earth, temperature of, at various places, 94, 95. Earths, certain of them enter into the composition of the food of mixed arrangement of their tissue, 29. Envelopes, not a necessary part of a flower, 56. Epidermis, in its young state, highly sensible to the stimulus of regulates the amount of perspiration, 53. of leaves, 39. an extension of the outer bark of the stem, 41. of the leaves of evergreens, 300. of plants inhabiting shaded situations, 44. Evaporation, an important vital function of plants, 129. affected by elevation, 133. affected by wind, 132. from the surface of scions, 246. Evergreen plants, 54. Evergreens, season for transplanting, 300. epidermis of their leaves, 300. Excitability diminished by lowness of temperature, 90. matter of plants superfluous, 21. |