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Lessons in Elementary Biology

Lessons in Elementary Biology


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: LESSON II HMATOCOCCUS The rain-water which collects in puddles, open gutters, andc., is frequently found to have a green colour. This colour is due to the presence of various organisms-?plants or animals?one of the commonest of which is called Hizma- tococcus (or as it is sometimes called Protococcus or Sphterelld) pluvialis. Like Amoeba, Haematococcus is so small as to require a high power for its examination. Magnified three or four hundred diameters it has the appearance (Fig. 3, A) of an ovoidal body, somewhat pointed at one end, and of a bright green colour, more or less flecked with equally bright red. Like Amoeba, moreover, it is in constant movement, but the character of the movement is very different in the two cases. An active Haematococcus is seen to swim about the field of the microscope in all directions and with considerable apparent rapidity. We say apparent rapidity because the rate of progression is magnified to the same extent as the organism itself, and what appears a racing speed under the microscope is actually a very slow crawl when divided by 300. It has been found that such organisms as Haematococcus travel at the rate of one foot in from a quarter of an hour to an hour: or, to expressthe fact in another and fairer way, that they travel a distance equal to z times their own diameter in one second. In swimming the pointed end is always directed forwards and Fig. 3.?A. Htematococcus pltrvialis, motile phase. Living specimen, showing protoplasm with chromatophores (chr) and pyrenoids (Pyr), cell-wall (c.w) connected to cell-body by protoplasmic filaments, and flagella ft. The scale to the left applies to Figs. A?D. B. Resting stage of the same, showing nucleus () with nucleolus ('), and thick cell-wall (c.w) in contact with protoplasm. C....


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Product Details
  • ISBN-13: 9780217013116
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 114
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 0217013112
  • Publisher Date: 19 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 218 gr


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