. Nature and development of plants. Botany. NATURE OF PLANTS 99 istic tissues already noted in the leaves and stems; while a cor- responding growth in the cortex and adjacent regions results in the formation of vascular bundles that connect the vascular bundles of the stem with those of the leaves and branches. When a leaf falls off, the ends of these vascular bundles can be easily seen in the leaf scar (Fig. 28, A) but owing to their minuteness. Fig. 63. Diagram of the tip of a stem as seen in longitudinal section: a, formative region corresponding ta the part shown in Fig. 61; /, b, leaves a
. Nature and development of plants. Botany. NATURE OF PLANTS 99 istic tissues already noted in the leaves and stems; while a cor- responding growth in the cortex and adjacent regions results in the formation of vascular bundles that connect the vascular bundles of the stem with those of the leaves and branches. When a leaf falls off, the ends of these vascular bundles can be easily seen in the leaf scar (Fig. 28, A) but owing to their minuteness. Fig. 63. Diagram of the tip of a stem as seen in longitudinal section: a, formative region corresponding ta the part shown in Fig. 61; /, b, leaves and branches in various stages of development; v, vascular bundles; c, cortex; p, pith. it is not an easy matter to trace them through the stem to the point where they join on to the bundles of the stem. In the branch, however, owing to its size and woody character, the union with the stem is very manifest. Fig. 64 shows several very small branches that continued to keep pace for one or more. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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