A treatise on architecture and building construction . Fig. 2. §9 Fig. 3. beech and sycamore, but are not so well defined in birch,chestnut, and maple. 16. The structure of the stem, as it presents itself tothe observer on examining the end of an oak or ash tree of13 years growth, is shown in Fig. 3, in which the porousfibers or sap vessels of the coarser texture areshown at a, a; the closertexture at b^ b\ the pri-mary medullary rays ati, i, and the secondaryones at j,j; the zone ofthe bark being shown atc, c. In a temperateclimate the process ofgrowth may be thusdescribed: In the
A treatise on architecture and building construction . Fig. 2. §9 Fig. 3. beech and sycamore, but are not so well defined in birch,chestnut, and maple. 16. The structure of the stem, as it presents itself tothe observer on examining the end of an oak or ash tree of13 years growth, is shown in Fig. 3, in which the porousfibers or sap vessels of the coarser texture areshown at a, a; the closertexture at b^ b\ the pri-mary medullary rays ati, i, and the secondaryones at j,j; the zone ofthe bark being shown atc, c. In a temperateclimate the process ofgrowth may be thusdescribed: In the spring,the foots extract the juices (generally called crude sap)requisite for vegetable growth from the earth; the crudesap circulates from cell to cell and through the fiber tubes,and ascends and forms the leaves. At the upper surface of the leaves, under the influence oflight, chemical changes take place, the sap absorbing carbonfrom the air and becoming denser. After the leaves arefully developed, there is no further growth until theautumn, when the so called elaborate
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Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding
