How crops growA treatise on the chemical composition, structure, and life of the plant, for all students of agriculture .. . ce. In studying many of the maturer parts of plants, viz.:such as have ceased to enlarge, as the full-sized leaf, theperfectly formed wood, etc., we find the cells do not cor-respond to the description just given. In external shape,thickness, and appearance of the cell-wall, and especiallyin the character of the contents, there is indefinite this is the result of change in the original cells, which,so far as our observations extend, are always, at first,forme
How crops growA treatise on the chemical composition, structure, and life of the plant, for all students of agriculture .. . ce. In studying many of the maturer parts of plants, viz.:such as have ceased to enlarge, as the full-sized leaf, theperfectly formed wood, etc., we find the cells do not cor-respond to the description just given. In external shape,thickness, and appearance of the cell-wall, and especiallyin the character of the contents, there is indefinite this is the result of change in the original cells, which,so far as our observations extend, are always, at first,formed closely on the pattern that has been explained. Vegetable Tissue.—^It does not, however, usually hap-pen that the individual cells of the higher orders of plautsadmit of being obtained separately. They are attachedtogether more or less firmly by their outer surfaces, so asto form a coherent mass of cells—a tissue, as it is the accompanying cut, fig. 30, is shown a highlymagnified view of a portion of a very thin slice across ayoung cabbage stalk. It exhibits the outline of the ir-10* 226 HOW CKOPS LJr 30. regular empty cells, the walls of which are, for the mostpart, externally united and appear as one, a. At the pointsindicated by b, cavities between the cells are seen, calledintercellular spaces. A slice across the potato-tuber, (seefig. 52, p. 277,) has a similar appearance, except that the cells are filled with starch,and it would be scarcelypossible to dissect themapart; but when a pota-to is boiled, the starch-grains swell, and the cells,in consequence, separatefrom each other, a practi-cal result of which is tomake the potato thin slice of vegetableivory (the seed of Phy-telephas macrocarpa),under the microscope, dry or moistened with water, pre-sents no trace of cell-structure, the cells being united asone; however, upon soaking in sulphuric acid, the masssoftens and swells, and the individual cells are at oncerevealed, their surfaces sepa
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectagricul, bookyear1868
