. Elements of plant anatomy;. Botany -- Anatomy. ANATOMY OF THE CELL. the current is continued, the surplus escapes from between the micellae and collects in some part of the cell where it forms a vacuole. This is rendered possible by the nature of the cell wall, which at this stage of growth is not only flexible but elastic. If only one vacuole is formed, it usually occupies the central portion of the cell, and as it increases in size, presses back the protoplasm against the wall so that the protoplasmic contents now assume the form of a layer of greater or less. Fig. 1. Cell "With nucle
. Elements of plant anatomy;. Botany -- Anatomy. ANATOMY OF THE CELL. the current is continued, the surplus escapes from between the micellae and collects in some part of the cell where it forms a vacuole. This is rendered possible by the nature of the cell wall, which at this stage of growth is not only flexible but elastic. If only one vacuole is formed, it usually occupies the central portion of the cell, and as it increases in size, presses back the protoplasm against the wall so that the protoplasmic contents now assume the form of a layer of greater or less. Fig. 1. Cell "With nucleus n near the wall. The vacuole p con- tains cell sap by which the protoplasmic body is pressed back against the wall causing turgescence.— Theodore Hartig. Fig. 2. Protoplasm containing sev- eral vacuoles, nucleus cen- tral.—(T. H.) Fig. 3. Protoplasm in fine strings running through cavities containing cell sap. — {T. H.) thickness, lining the wall and pressing firmly against it. In such cases the nucleus lies imbedded in this layer and is therefore called lateral.^ If several vacuoles are formed at the same time, the nucleus remains near the centre of the cell between the vacuoles but always surrounded by protoplasm. When the vacuoles are large the protoplasm between them becomes reduced to mere threads, so that the central portion appears crossed by fine filaments. Outward against the cellulose wall, as well as in- ward toward the cell-sap, the protoplasm is bounded by a very 1 The name prwiordial utricle is sometimes applied to this layer of proto- plasm, but the term is falling into disuse and the different parts of the proto- plasmic mass have received new names corresponding with their Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gregory, Emily L. Boston, London, Ginn & Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotanya, bookyear1895
