Illustrations of Vegetable Physiology Practically Applied to the Cultivation O
Illustrations of Vegetable Physiology Practically Applied to the Cultivation O
James Main
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The same kind of protuberance is often formed at the base of cuttings previous to the ejection of fibres (Fig. 38) ; and also round a wound on a Fig. 38. stem, particularly at the upper side (Fig. 39). Such accidental eruptions on old trees continue to be enlarged for many years, and receive annual additions of bark and wood, like any other part of the trunk ; 126 VEGETABLE SAP. Fig 3. 9. \ their form being generally oblongly round, but in- creasing downward much more rapidly than in any other ...direction. (Fig. 40. ) Fig. 40. A protuberance on an elm. When these protuberances are laid open, we find them composed of either cambium on their first appearance, or of ligneous material after they are six months old ; and evidently dilatations of the vital VEGETABLE SAP. 127 envelope. Some former, and many modern, botanists consider these callosities as no other than obstructions of the returning- sap ; others conceive that they are fibres projected from the buds and shoots above, which are arrested in their progress down, and accumulating above the constriction cause the distortions in question.
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