Botanical and Physiological Memoirs

Botanical and Physiological Memoirs

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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. 1853 edition. Excerpt: ...darker areolae through the collection of granules into groups. When the new distribution of the contents is complete, the light intermediate streaks appear as everywhere pretty equally broad, light-yellowish (not green) lines, sharply defined upon the dark Held; the latter displays little polygonal (mostly hexagonal, rarely pentagonal or heptagonal) green plates, with a more or less brownish tinge, sometimes appearing wholly tilled with granules, sometimes displaying a lighter space, free from granules, in their centres. In correspondence with the shape and the (in the same mother-cell) tolerably equal size of the plates, they are so arranged that mostly six are grouped round a central one. The size of the plates varies according as they are to form macrogonidia (net-formers) or microgonidia (swarmers); in the former case the diameter amounts to about th millitn., in the latter to th or Tth; the latter, moreover, exhibit a less regular, more oblique shape, and less numerous (only 4--10) chlorophyll granules. The membrane of the parent-cell begins to thicken by swelling-up in this stage. In the third stage, finally, is effected the complete separation of the little plates, and the formation of the gonidia. The plates, already previously clearly defined against the light intermediate streaks, begin to round off at the corners, and to become convex at the surface, previously lying flat against the cell-membrane, so that the tabular form passes, not at once into a globular, but into a lenticular form, which compression may still be observed in a slight degree subsequently, in the stage of motion. During this rounding, the lighter intermediate streaks vanish, the gonidia come into direct contact, triangular intercellular spaces only appearing at each...show more

Product details

  • Paperback | 190 pages
  • 189 x 246 x 10mm | 349g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236528050
  • 9781236528056