. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. Fi8. 68.. Cracking of thebark on an elmbranch. EXPANSION OF TEE BARK 71 75. The lower part of the limb shows that theonter layers of bark (which are long since dead, andact only as protective tissue) have reached the limitof their expanding capacity and have begun to split.The pupil will now be interested in the bark uponthe body of an old elm tree (Fig. 69); and heshould be able to suggest one reason why stemsremain terete, and why the old bark becomesmarked with furrows, scales and plates.
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. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. Fi8. 68.. Cracking of thebark on an elmbranch. EXPANSION OF TEE BARK 71 75. The lower part of the limb shows that theonter layers of bark (which are long since dead, andact only as protective tissue) have reached the limitof their expanding capacity and have begun to split.The pupil will now be interested in the bark uponthe body of an old elm tree (Fig. 69); and heshould be able to suggest one reason why stemsremain terete, and why the old bark becomesmarked with furrows, scales and plates. 76. If, for any reason, the bark should becomo-so dense and strong that the trunk cannot expand, the tree is said to be bark-bound. Such condi-tion is not rare in orchard trees which have beenneglected. When good tillage is given to suchtrees, they may not be able to overcome the rigid-ity of the old bark, and, therefore, do not respondto the treatment. Sometimes the thinner - barkedlimbs may outgrow in diameter the trunk or theold branches below them. The remedy is to releasethe tension. This may be done ei