. How crops grow. A treatise on the chemical composition, structure and life of the plant, for students of agriculture ... Agricultural chemistry; Growth (Plants). 308 HOW CKOPS GROW. There are many leafy plants cultivated for ornamental purposes with more or less brown, red, yellow, white, or variegated foliage, which are by no means destitute of chlorophyl, as is shown by micro- scopic examination, though this substance is associated with other coloring matters which mask its green tint. Structure of Leaves.âWhile in shape, size, modes of arrangement upon and attachiiient to the stem, we fin
. How crops grow. A treatise on the chemical composition, structure and life of the plant, for students of agriculture ... Agricultural chemistry; Growth (Plants). 308 HOW CKOPS GROW. There are many leafy plants cultivated for ornamental purposes with more or less brown, red, yellow, white, or variegated foliage, which are by no means destitute of chlorophyl, as is shown by micro- scopic examination, though this substance is associated with other coloring matters which mask its green tint. Structure of Leaves.âWhile in shape, size, modes of arrangement upon and attachiiient to the stem, we find among leaves no end of diversity, there is great sim- plicity in the matter of their internal structure. The vfhole surface of the loaf, on both sides, is cov- ered with epidermis, a coating which, in many cases, may he readily stripped off the leaf, and consists of thick- walled cells, which are, for the most part, devoid of liq- uid contents, except when very young. {^E, E, Pig. 56.) Fig. 56 represents the appearance of a bit of bean-leaf as seen on a section from the upper to the lower sui-face, and highly maguifled. Below the upper epidermis, there often occur one or mor^ layers of oblong cells, whose sides are in close con- tact, and which are arranged endwise, with reference to the flat of the leaf. Below these, down to the lower epi- dermis, for one-half to three-quarters of the thickness of the leaf, the cells are commonly spherical or irregular in figure and arrangement, and more loosely disposed, with numerous and large interspaces. The interspaces among the leaf-cells are occupied with air, which is also, in most cases, the only content of the epidermal cells. The interior cells of the leaf are filled with sap and contain the cMorophyl- 'â granules. Under the microscope, these are commonly seen attached to the walls ' of the cells, as in Fig. 56, or coating grains of starch, or else floating free in the cell-sap. The structure of the veins or ribs of the leaf is
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectagriculturalchemistr
