7 Reprints on Comparative Anatomy

7 Reprints on Comparative Anatomy

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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. 1873 edition. Excerpt: ...the space immediately within the layer of connective-tissue cells. The fibres composing the mass are disposed hi a concentric manner externally around the centre of the mass, and more internally around two rounded cavities situate side by side in its centre. Appearances similar to this are presented by a section of Heliopora, prepared as described, cut parallel to the surface and viewed from beneath, sometimes two and sometimes one cavity appearing in the fibrous mass. The fibrous masses occupy the position which in the undccalcified coral is occupied by the projecting points of the corallum, and are identical in structure with the small investment of fine fibrous tissue which can be obtained from a growing point of the corallum by decalcification. But the quantity thus derived from a portion of the corallum cleaned with potash is very small, and bears no proportion to the mass shown in fig. C. The spaces A, B were probably occupied by the central parts of two newly formed excrescences on a projecting point of the corallum, whilst the hard tissue was extended thence for some distance amongst the fibrous tissue, but how far is uncertain. I have not been able to prepare sections of hard and soft parts in contact which will show this. I have not seen the finely fibrous tissue in the deeper parts of the corallum; but in some preparations it is to be recognized in longitudinal sections, as at Plate 9. fig. 10, P, though here not showing the fibrous structure. It seems probable that the layer of connective-tissue cells produces the finely fibrous tissues, and that within this tissue the calcareous matter is deposited from within outwards, the fibrous tissue gradually being removed and absorbed. The finely fibrous tissue may be termed calciferous....show more

Product details

  • Paperback | 124 pages
  • 189 x 246 x 7mm | 236g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236550390
  • 9781236550392