INDEX. 



583 



Bottom-heat, a stimulus and protection 

 to vegetation, 134 



degree of, communicated 



to plants in pots from 

 tlie atmosphere of a 

 stove, 1S2 



its effects different from 



those resulting from 

 solar radiation, 126 



its great importance when 



well regidated, 150 



Knight's opinion respect- 

 ing its necessity, 152 



necessary for the flowering 



of many tropical plants, 

 148 



though beneficial in the 



first instance becomes a 

 source of mischief, 135 



waste steam as a medium 



of, 151 



Bradley, Richard, his book on the propar 

 gation of plants by leaves, 271 



Branches, effect of shortening, 362 



effect of their being in a dif- 



ferent temperature from 

 their roots, 69 



inarching of, 326 



in which buds are inserted 



should be shortened, 307 



■ their vigour augmented by the 



abstraction of flowers and 

 fruit, 487 

 Breeds, the best produced by the best 



seeds, 487 

 Brussels sprouts, supposed disposition to 



degenerate, 470 

 ■ the question of degene- 

 racy reftited, 471 

 Buds, adventitious, developed by the 



stems of trees, 260 

 adventitious, in roots, 30, 302 



embryo, 44 



formed in the axils of stamens, 54 



instances of their formation on 



leaves, 80, 272 



■ latent, 54 



. mature preferable to immature for 



the purpose of propagation, 306, 



337 



mode of propagating by, 265 



not the origin of roots, 25 



power of leaves to form, 54, 80, 



272 



the origin of branches, 25 



the youngest most excitable, 837 



■ ■ their formation in all cases the first 



step in the process of propagar 

 tion, 276 



Budding, D'Albret's practice, 309 



Budding, flute, 308, 313 



inverted J., 312 



ligatures -usually employed iuc 



305 



mode of executing, 304, 310 



ought not to be performed in 



wet weather, 309 



propagation by, 303 



reverse, 307 



shield, 305, 312 



time to perform, 311 



Bulbs, 43 



a species of bud, 44 



■ cultivation of, 165 



in arid regions, 508 



mode of treating newly imported, 



165 

 precautions demanded in the 



packing of, 254 



propagation by, 473 



Burnt clay as a manure, 665 



Cacti, best time for grafting, 316 



method of grafting, 315 



instance of their living for years 



without water, 261 

 Callus, 36 

 Calyx, its situation and colour, 81 



its use, 95 



Cambium, 310 



Camellias, a method bf propagating 

 them, 325 

 packing growing plants of, 258 



Canker, cause of, 148 

 Cape-Heaths, mode of striking, by cut- 

 tings, 298 

 • importance of good drain- 



age for, 437 

 Capillary tubes give hygrometrical force 



to tissue, 27 

 Carbon, excess of, in seeds, 14 



in seeds, 243, 247 



■ — • requires its proportion 



altered before germi- 

 nation can be effected, 

 104 



its conversion into carbonic acid 



during the process of germina- 

 tion, 14 

 Carbonate of ammonia, mode of apply- 

 ing it to plants, 

 549 



must be applied 



with great cau- 

 tion, 650 

 Carbonic acid, a component part of the 

 food of plants, 28, 544 



— . conditions under which it 



is slowly formed, 233, 

 644 



