Congressional Edition Volume 3264

Congressional Edition Volume 3264

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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. 1895 edition. Excerpt: ...In any case their origin is endogenous (in the endoplasm) and probably occurs in the manner observed by Prof. Biitschli in Myxidium lieberkiihnii, where a spore membrane is formed around a trinucleate globule. In our case are often found, in the Plasmodium, nuclei in state of division. Around such nuclei, which are still united by the threads of the spindle, a resistant shell appears often to be present. Could this be a spore? Korotneff is able to confirm Biitschli's observation that spore formation does not mark the end of the life cycle. In M. brt/ozoides, however, the spores always appear at a definite period of that cycle, viz, after the complete disappearance of the nuclei of the host-cell. Spore.--Elongate-oval, resembling a melon seed, sharp anteriorly, rounded off posteriorly. Shell extremely hard, very resistant, lustrous, apparently with an opening at the sharp (anterior) end; no bivalve structure demonstrable, though empty spores are not rare. Often, but not always, two vacuoles are visible. In the spring he was able to distinguish at the anterior end of the spore a glittering point whose signification was unknown. It might possibly be a capsule (nematocyst; Nesselkapsel). Habitat.--In very considerable numbers in the body cavity of Aleyonella fungosa (a fresh-water polyzoan) in the neighborhood of Moscow, in the beginning of summer. The infection appears to be endemic, as Korotneff has never observed it in southern Russia and as it appears to be absent from western Europe. Seat and pathological anatomy.--Principally grouped around the funicle upon which the spermatoblasts (which serve as food for the young myxosporidia) are produced. No tissue except the spermatoblasts is attacked. Repeated careful investigations showed the absence of...show more

Product details

  • Paperback | 306 pages
  • 189 x 246 x 16mm | 549g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236495292
  • 9781236495297