An Introduction to the Study of Zoology, Illustrated by the Crayfish

An Introduction to the Study of Zoology, Illustrated by the Crayfish

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...lower Fig. 50.--Antaeus JluviatilU.--Epithelium, from the epidermic layer subjacent to the cuticle, highly magnified. A, in vertical section; B, from the surface, n, nuclei. parts of the caeca, and their essential nature is thus obvious. 8. Immediately beneath the epithelial layer follows a tissue, disposed in bands or sheets, which extend to the subjacent parts, 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 very closely resembles the epithelial tissue, except that the intervals between the nuclei are wider, and that the substance in which they are imbedded cannot be broken up into a separate cell-body for each nucleus. In the second form (fig. 51, A) the matrix exhibits fine wavy parallel lines, as if it were marked out inta imperfect FlG. 51.--Astacus flttviatilit.--Connective tissue; A, second form; B, third form, a, cavities; -, nuclei. Highly magnified. fibres. In this form, as in the next to be described, more or less spherical cavities, which contain a clear fluid, are excavated in the matrix; and the number of these is sometimes so great, that the matrix is proportionally very much reduced, and the structure acquires a close superficial similarity to that of the parenchyma of plants. This is still more the case with a third form, in which the matrix itself is marked off into elongated or rounded masses, each of which has a nucleus in its interior (fig. 51, B). Under one form or another, the connective tissue extends throughout the body, ensheathing the various organs, and...show more

Product details

  • Paperback | 78 pages
  • 189 x 246 x 4mm | 154g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236610083
  • 9781236610089