. The elements of forestry, designed to afford information concerning the planting and care of forest trees for ornament or profit and giving suggestions upon the creation and care of woodlands with the view of securing the greatest benefit for the longest time, particularly adapted to the wants and conditions of the United States. Forests and forestry. 59. Structure of Co nifcrous Woods. and consists of about 44A per cent of carbon, per cent of hy- drogen, and per cent of oxygen. 250. However plants may differ in form and structure, they are all the result of cell-growth. These cells
. The elements of forestry, designed to afford information concerning the planting and care of forest trees for ornament or profit and giving suggestions upon the creation and care of woodlands with the view of securing the greatest benefit for the longest time, particularly adapted to the wants and conditions of the United States. Forests and forestry. 59. Structure of Co nifcrous Woods. and consists of about 44A per cent of carbon, per cent of hy- drogen, and per cent of oxygen. 250. However plants may differ in form and structure, they are all the result of cell-growth. These cells form in the interior of pre-existing cells by subdivision, and, by pressing upon one another, they elongate into fibrous forms, as already shown on page 68. When macerated, these fibers may be separated, and sometimes they afford differences that enable us to determine the class or group to which the woods belong. In the coniferse, there are thin places along the sides of the cells, which can be readily seen under the mi- croscope, and can be found even in the fibers of paper made from wood. 257. In some woods, as, for example, the oak, ash, "svalnut, etc., the cells grow to a larger size, so as to be visible to the naked eye. Tliese form ducts, which are not continuous for great length, but are intermingled in various forms, presenting in cross-sections the appearance of pores. They usually contr/m air, at certain sea- sons sap. In ascending among these fibers, the sap passes up be- tween and among the fibers, and through their partitions. In some of the larger ducts, they have a spiral coil of fiber, or the sides are made up of rings, and they are sometimes marked with dots. 258. In resinous woods, the turpentine is contained iii larger cavities, surrounded by smaller cells. The abundance of this product depends in a great degree upon the vigor of growth, and exposure to the air and light. 259. The annexed cut shows a section of the linden six years old, enlarged a
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectforestsandforestry
