INDEX. 



591 



Knight, Mr., precautions taken by, in 

 raising new Tarieties 

 from seed, 494 



■ result of his experiments 



in raising new varieties 

 from seed, 487 



. hia tlieory that all parts of 



a tree have a common 

 end to their life refuted, 

 269, 475 



Laob-bark tree, soil for, and manage- 

 ment of, 635 

 Laudanum, its effects on plants, 8 

 Layers, propagation by, 301 

 their nature and method of pre- 

 paring, 301 

 Layering, Chinese mode of, 302 

 Leaf, analogous to the stomach and lungs 

 of animals, 72 



an expansion of the bark, 56 



belongingtothebudshouldbepartly 



removed in 

 budding, 307 

 doubtful advan- 

 tage of, in dry 

 weather, 308 



-supposed to be 



beneficial in 

 wet weather, 

 308 



&U of, 79 



Leaf-buds, adventitious, 44 



locality of their formation, 



43 



formation on leaves, 80, 272 



stems, 43 



■ their identity with blossom- 

 buds in the first stage of 

 their organisation, 92 



. their importance, 45 



the parents of wood, 45 



their presence universal, either 



latent or developed in the 

 axUs of leaves, 54 



their reproductive properties 



different from that of seeds, 13 

 Leaves absorb fluid from the air, 69 



■ anatomy of, 56 



■ ■ are organs of digestion and respi- 

 ration, 80 

 are the great agents of propaga- 

 tion, 276 

 cases which justify their remo- 

 val, 73 



■ centrifugal development of, 55 



centripetal development of, 55 



experiments to show their in- 

 fluence upon increasing the 

 trunk of trees, 71 



Leaves, force of suction by, 69 



fully grown are the best for the 



purpose of propagation, 277 



give origin to woody tissue, 34 



have universally leaf-buds, either 



latent or developed, in their 

 axils, 54 



history of their development ex- 

 plained, 55 



how to strike, 277 



instances of their forming buds, 



80, 272 



mixed development of, 56 



modified, constitute the parts of 



flowers, 92 



M. Neumann's modes of propa- 

 gating by, 278 



number of stomates on the surface 



of, in various species, 58 



objection against employing them 



as a means of propagation, 

 278 



parallel development of, 56 



period when they cease to decom- 

 pose carbonic acid, 79 



propagation by, 80, 272 



raiionale of the rooting of, 275 



remarkable instance of plants 



continuing to exist and increase 

 in size without, 74, 76 



rooting of, 23, 274 



rooting of, conditions favourable 



for, 275 

 their action, 54 



their action forms the peculiar 



secretion of plants, 70' 



their action reciprocal with that 



of the roots, 19 



their attracting force partly causes 



the sap to ascend, 52 



their colour influenced by light, 



70 



their epidermis, 57 



their free action essential to the 



health of plants, 59 



th^ir functions strengthened by 



the early removal of the fructi- 

 fication, 105 



their great importance, and the 



injury plants sustain by remov- 

 ing them, 72 



their nature, 54 



their perspiratory action renders 



transplantation of deciduous 

 trees in a growing state diffi- 

 cult, 446 



their physiological- action analo- 

 gous to that of the fruit, 97 



their power of forming buds, 54, 



80, 272 



