Contributions Volume 2

Contributions Volume 2

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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. 1904 edition. Excerpt: ...following properties; the substance was homogeneous, they became swollen and disappeared when placed in sulphuric or hydrochloric acid, Millon's reagent gave no color to them though they were turned slightly blue by iodine (5) or chlor-zinc iodide. Isolated cells of Oscillaria viewed from the "end" showed that the granules were arranged in a circle around the central opening through which passed the connecting thread of protoplasm or cyanophycin. The cell wall and sheath were composed of a substance akin to cuticle. This sheath was very delicate in Oscillaria, and was often overlooked. It became thick over the rejuvenated ends of the filaments, forming thus a kind of protective cap. In spore formation, cyanophycin in the cell became the chief part of the spore and the cell seemed to rejuvenate. An encysting wall was then formed around the spore and the mother wall disintegrated. After investigating numerous forms of Tolypothrix, Oscillaria, Nostoc, Spirulina, etc., Zopf (95) concluded that the filamentous forms were but one stage in the life-history of the "Spaltalgen." By growing filamentous forms on tiles imbedded in moist sand in such a way that very little nourishment could be obtained by them, he was able to cause the filamentous plants to assume the forms of short rods and coccus-shaped cells, thus proving that a much closer connection existed between the Cyanophyceae and the Bacteria than had been hitherto supposed, even by Cohn or Sachs (66) who were the first to place the two groups together in the Schizophyta. Several forms as here described are doubtless produced when a filamentous alga breaks down in death, but it would, however, scarcely seem proper to consider as a part of the life-history of a plant, a...show more

Product details

  • Paperback | 132 pages
  • 189 x 246 x 7mm | 249g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236579283
  • 9781236579287