. Un manuel de botanique. La botanique. Morphologie générale OP L'USINE 35 parties de la plante, comme sur la racine, la partie ligneuse de la tige, les feuilles, et d'autres organes. Ainsi, lorsqu'un arbre est pol- lardé, c'est, quand les branches principales et l'apex du tronc sont coupés, et une grande quantité de matières nutritives s'accumule donc dans ce dernier, une multitude d'adventi- bourgeons infectieux sont formées, dont les branches sont développés. Les branches ainsi produite par l'émondage sont, cependant, dans une certaine mesure, complétées par l'élaboration régulière de CRF. 47 La FiQ. 48. Fig. 49,. Fig. 47. Branch

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. A manual of botany. Botany. GENERAL MORPHOLOGY OP THE PLANT 35 parts of the plant, as on the root, the woody portion of the stem, the leaves, and other organs. Thus, when a tree is pol- larded, that is, when the main branches and the apex of the trunk are cut off, and a great quantity of nutritive materials consequently accumulates in the latter, a multitude of adventi- tious buds are formed, from which branches are developed. The branches thus produced by pollarding are, however, to a certain extent, also supplemented by the development of regular Fiu. 47 FiQ. 48. Fig. 49, . Fig. 47. Branch of a species of -Maple with tliree buds a, placed side by side. Fuj. 48. A piece of a branch of the Wabmt-tree. p. The petiole having in its axil a number of buds placed oue above the other, the uppermost, &, most developed. Fig. 49. A piece of a branch of the Tartarian Honeysuckle (.Loniccra tartarica), bearing a leaf, /, with numerous buds, S, in its axil, placed above one another, the lowermost being the most developed. buds which have become dormant fiom some cause having hitherto interfered with their growth. Leaves bearing buds are called proliferous. Such buds may be produced artificially on various leaves, such as those of species of Oesnera, Qloxinia, Begonia, by the infliction of wounds, and by afterwards placing them in a moist soil, and exposing them to the other influences which are favourable for the growth of buds. The buds developed on the leaves, in such cases, ultimately form independent plants, and this process is therefore constantly resorted to by gardeners as a means of propagation. These adventitious buds differ from those com- monly produced in the axils of leaves, or at least from those which remain dormant during the winter, in being smaller, and having no external protective organs or scales (figs. 45-46). 3. Accessory Buds.—The third cause of irregularity in the. Please note that these images are extracted from scanned page images that may have

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