. Nature-study; a manual for teachers and students. Nature study. 3o6 NATURE-STUDY ducts. Outside of the tubular part of the stem is the bark, not yet hard in young tree shoots and in herbaceous plants. In cornstalks, lily stems, palm stems, and grasses, the strands are not thus arranged, but are found distributed throughout the pithy substance of the stem. If we cut across a twig of a tree that has become woody,. Fig. III. Section of Cora Stalk Showing Fibrovascular Btmdles, (Photomicrograph.) we shall see that the woody part is distinct from the bark on the outside and a pithy portion at the
. Nature-study; a manual for teachers and students. Nature study. 3o6 NATURE-STUDY ducts. Outside of the tubular part of the stem is the bark, not yet hard in young tree shoots and in herbaceous plants. In cornstalks, lily stems, palm stems, and grasses, the strands are not thus arranged, but are found distributed throughout the pithy substance of the stem. If we cut across a twig of a tree that has become woody,. Fig. III. Section of Cora Stalk Showing Fibrovascular Btmdles, (Photomicrograph.) we shall see that the woody part is distinct from the bark on the outside and a pithy portion at the centre. In the spring the bark can be easily peeled from the wood. This is because there is then a layer of especially thin-walled cells between them which can be easily torn. In making a whistle of willow or basswood, boys beat upon the bark to crush this layer of cells and thus loosen the bark. It is in this layer, called the growing zone, that the new growth in the thick-. 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 Holtz, Frederick Leopold, 1870-. New York, C. Scribner's Sons
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