How crops growA treatise on the chemical composition, structure, and life of the plant, for all students of agriculture .. . atter of vegetation, —theso-called chlorophyll, or leaf-green, Under the microscope, this sub-stance is commonly seen in the formof minute grains attached to the wallsof the cells, as in fig. 56, or coatingstarch granules, or else floating free in Fy. 50 the cell-sap. The structure of the veins or ribs of the leaf is similarto that of the vascular bundles or fibers of the stem, ofwhich they are branches. At a, fig. 56, is seen the crosssection of a vein in the bea
How crops growA treatise on the chemical composition, structure, and life of the plant, for all students of agriculture .. . atter of vegetation, —theso-called chlorophyll, or leaf-green, Under the microscope, this sub-stance is commonly seen in the formof minute grains attached to the wallsof the cells, as in fig. 56, or coatingstarch granules, or else floating free in Fy. 50 the cell-sap. The structure of the veins or ribs of the leaf is similarto that of the vascular bundles or fibers of the stem, ofwhich they are branches. At a, fig. 56, is seen the crosssection of a vein in the bean-leaf. The epidermis, while often smooth, is frequently besetwith hairs or glands, as seen in the figure. These are va-riously shaped cells, sometimes empty, sometimes, as inthe nettle, filled with an acid liquid. Their ofiice is littleunderstood. Leaf-Pores.—^The epidermis is further provided with avast number of curious breathing pores, or stomata, bymeans of which the intercellular spaces in the interior ofthe leaf may be brought into direct communication withthe outer atmosphere. Each of these stomata consists. 286 HOW CHOPS GROW.
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectagricul, bookyear1868
