. The plant, an illustration of the organic life of the animal. Biology. 54 THE TISSUES OP PLANTS ginated, appears but as a small opaque body, which is either centrally located, or attached to one of its walls. Thus, according to Sohleiden, the cytoblast or nucleus visible in the cellule, has originated the cellule itself. It is seldom, however, that the cytoblast remains visible for any length of time after the cell has been fully formed; generally, it is re-absorbed. The cytoblast is beautifully apparent in the moniliform hairs of Tradescantia Virginica. • The elementary cells which compose
. The plant, an illustration of the organic life of the animal. Biology. 54 THE TISSUES OP PLANTS ginated, appears but as a small opaque body, which is either centrally located, or attached to one of its walls. Thus, according to Sohleiden, the cytoblast or nucleus visible in the cellule, has originated the cellule itself. It is seldom, however, that the cytoblast remains visible for any length of time after the cell has been fully formed; generally, it is re-absorbed. The cytoblast is beautifully apparent in the moniliform hairs of Tradescantia Virginica. • The elementary cells which compose the tissues of ani- mals also contain these nuclei or cytoblasts. Fig. 12. I .. Nucleated cartilage cells from tlie Chorda dorsalis of a Lamprey. Of this we have ai very beautiful and striking proof afforded in the above engraving. The Chorda dorsalis is an extremely thin and delicate tube, composed of cells in close opposition with each other, and enclosing the spinal chord. It is, in fact, the vertebral oolumn arrested in the first stage of its development. This is its permanent con- dition in the lamprey, and also in the lowest group of car- tilaginous 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 Coultas, Harland, d. 1877. Philadelphia ; Perry and Erety
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