. The crayfish : an introduction to the study of zoology . Crayfish. 178 THE MOEPHOLOGY OF THE COMMON CRAYFISH. consist of a protoplasmic substance (fig. 50), in which close set nuclei {n) are imbedded. If a number of blood corijus- cles could be supposed to be closely aggregated together into a continuous sheet, they would give rise to such a structure as this; and there can be no doubt that it really is an aggregate of nucleated cells, though the limits between the individual cells are rarely visible in the fresh state. In the liver, however, the cells grow, and become detached from one anot
. The crayfish : an introduction to the study of zoology . Crayfish. 178 THE MOEPHOLOGY OF THE COMMON CRAYFISH. consist of a protoplasmic substance (fig. 50), in which close set nuclei {n) are imbedded. If a number of blood corijus- cles could be supposed to be closely aggregated together into a continuous sheet, they would give rise to such a structure as this; and there can be no doubt that it really is an aggregate of nucleated cells, though the limits between the individual cells are rarely visible in the fresh state. In the liver, however, the cells grow, and become detached from one another in the wider and lower. Fig. 50.—Astacus ^wuMiiZw.—Epithelium, from the epidermic layer subjacent to the cuticle, highly magnified. A, in vertical section ; S, from the surface, n, nuclei. parts of the c83ca, and their essential nature is thus obvious. 3. Immediately beneath the epithelial layer follows a tissue, disposed in bands or sheets, which extend to the subjacent j)arts, invest them, and connect one with another. Hence this is called connective tissue. The connective tissue presents itself under three forms. In the first there is a transparent homogeneous-looking matrix, or ground substance, through which are scattered many nuclei. In fact, this form of connective tissue. 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 Huxley, Thomas Henry, 1825-1895. London : Kegan Paul, Trench, Tru?bner & Co.
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Keywords: ., bookauthorhuxleyth, bookcentury1900, bookdecade1900, bookyear1906
