. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. THE CELL. 79 free and when confined by a cell-wall. Swarm-spores (Fig. 169), which consist of a mass of protoplasm des- titute of a covering, swim through water by means of their cilia, or hair-like protoplasmic elongations. The slime moulds consist, in their vegetative or growing stage, of naked protoplasm, and this is able to creep slowly about over rotten wood in damp forests, where they usually grow. Diatom
. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. THE CELL. 79 free and when confined by a cell-wall. Swarm-spores (Fig. 169), which consist of a mass of protoplasm des- titute of a covering, swim through water by means of their cilia, or hair-like protoplasmic elongations. The slime moulds consist, in their vegetative or growing stage, of naked protoplasm, and this is able to creep slowly about over rotten wood in damp forests, where they usually grow. Diatoms (Fig. 182), which are one-celled plants, move freely about in the water, though in exactly what ^^^ manner they accomplish the movement is as yet not satis- factorily determined. The protoplasm confined in cell- walls exhibit two kinds of movement, called circulation and rotation. I02. The circulation of the protoplasm (Fig. 183) takes place in cells having a large sap-cavity, the proto- plasm existing as a parietal layer, connected by strings and bands with a more or less central mass; it consists of a movement (shown by the granules) in streams, mainly to and from the nucleus. The currents may be in opposite direc- tions, though side by side, and often contiguous ; they may gradually cease and then begin again in an opposite direction without apparent cause. The movement called rotation (Fig. 18-t) difiers from this, in that the whole mass of the protoplasm rotates or moves as a broad stream around the cell-wall, passing up one side and ' 183 down the other, carrying the granules. Fig, 182. A Diatom, Navicula viridis. Fig. 183. Circulation of Protoplasm in a cell; the arrows indicate the direction of the 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 Kellerman, William Ashbrook, 1850-1908. Ph
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1883
