The Midland Naturalist; The Journal of the "Midland Union of Natural History Sciences" with Which Is Incorporated the Entire Transaction of the Birmingham Natural History and Microscopical Society Volume 1-2 1878-1879

The Midland Naturalist; The Journal of the "Midland Union of Natural History Sciences" with Which Is Incorporated the Entire Transaction of the Birmingham Natural History and Microscopical Society Volume 1-2 1878-1879

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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. 1878 edition. Excerpt: ... has been observed, when the nucleus separates into two, each half being accompanied by its nucleolus. At the same time contractile cavities form themselves in each segment into which the body divides. I have observed frequent instances of true conjugation of Paramecin, twice in the month of January. They pair by placing themselves side by side. But I have occasionally seen two individuals swim about for a long time grappled end to end, and then come apart without actual conjugation. The cilia were unusually active at the point of junction. In Paramecium aurelia two contractile vacuoles are seen, each branching out star-fashion into short canals, which appear distinct during the contraction of the central cavity, and are almost obliterated during dilatation. I have found this pretty species swarming in stagnant pools in spring. Kerona, or Stylonyrhia, may be recognised by its slipper-like form, and the long spines and bristles with which it is furnished at both ends. In length it ranges from 1-275th to l-100th of an inch. The body is also beset with smaller seta;, besides the active cilia by which it moves. A line of these organs leads to the mouth, which is fringed with them. The mouth itself is placed a little to one side, and is clearly indicated by the streams of floating particles which set towards the spot. In the rear of this opening is situated a contractile space, which dilates slowly but contracts suddenly, the whole movement taking about six seconds to complete. These animalcules have the queer habit of jerking back at short intervals, as they make their way through the water. Sometimes two individuals will fasten on to each other by their terminal spines, and swim about so connected for a considerable time. The two species answering...show more

Product details

  • Paperback | 374 pages
  • 189 x 246 x 20mm | 667g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236615573
  • 9781236615572