. Experiments with plants. Botany. TBE WOTiK OF STEMS 267. 148. Diagram showiog the girder- like arrangement of strength- ening tissues {str) in a Bulrush {ISdrpiis). will be noticed that the thick-walled cells are placed at or near the periphery, where the greatest strain comes, while the center is hollow or occupied by pith. Cut off the head of a stalk of Wheat, weigh the stalk, and find a wire (of steel, iron, cop- per, brass, or, better still, one of each) of the same length as the stalk and as nearly the same weight as possible ; at- tach the head of Wheat to it with a small bit of sealin
. Experiments with plants. Botany. TBE WOTiK OF STEMS 267. 148. Diagram showiog the girder- like arrangement of strength- ening tissues {str) in a Bulrush {ISdrpiis). will be noticed that the thick-walled cells are placed at or near the periphery, where the greatest strain comes, while the center is hollow or occupied by pith. Cut off the head of a stalk of Wheat, weigh the stalk, and find a wire (of steel, iron, cop- per, brass, or, better still, one of each) of the same length as the stalk and as nearly the same weight as possible ; at- tach the head of Wheat to it with a small bit of sealing-wax and compare its rigidity in an upright position with that of the Wheat-stalk. In the blade of the leaf we find that each vein is a girder, or a system of girders, and usually projects from the under side of the leaf (see Fig. 149), which is the best theoretical construction. In the root we find the woody cells, not at the periphery, but at the center (). This may seem at first glance a 149. Cross-section of a Cabbage leaf through the midrib. pOOr COUStrUC- tion. When we remember, however, that the strain which comes upon the root is a pulling strain, we see. 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 Osterhout, Winthrop John Van Leuven, 1871-. New York, The Macmillan company; London, Macmillan & co. , ltd.
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