Studies; Reprints Volume 22

Studies; Reprints Volume 22

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ...and this is bridged over by a chain of elongated cells. When the liquefaction of the plasma is very great the loosening up stage assumes a somewhat different aspect. Figure 5 shows a culture which underwent this stage with a rather liquefied plasma. Certain sections, especially those on the right and left sides, where the plasma has remained fairly solid, are seen to have remained compact and to have a very marked fringed edge. In places where great liquefaction has occurred, the membrane has become torn, consequent upon the surface tension of the drop. Large spaces have been formed, partially bridged over by the columns of cells. The cells, following the greatest tension, range themselves at the edge of the drop in the form of a wreath of cells, the columns break down, and their central parts withdraw to the edge of the piece of membrane. If the liquefaction is still more extensive the entire rim of epithelium is torn away from the fragment and a wide wreath of cells is formed, completely surrounding the entire piece of membrane. This wreath at first consists of polygonal and spindle-shaped cells and is connected with the piece of membrane by means of the columns of cells (compare figure 6, slightly magnified, and figure 7, more highly magnified). Later all the columns are broken down by the action of the cells, now spherical in shape (figure 5, above, central part of the column), which withdraw from the middle of the column towards the periphery and center. The cells constituting the wreath likewise soon become spherical in shape, and the less favorable the conditions of nutrition the more rapidly is this change accomplished, and by the greater number of cells. Resting Stage.---If the fragment of membrane, together with the more

Product details

  • Paperback | 212 pages
  • 189 x 246 x 11mm | 386g
  • United States
  • English
  • black & white illustrations
  • 1236928482
  • 9781236928481