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Comparative Zoology, Structural and Systematic, for Use in Schools and Colleges

Comparative Zoology, Structural and Systematic, for Use in Schools and Colleges


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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. 1877 Excerpt: ... becomes invisible. for the yolk can turn upon its axis; it is, therefore, always nearest to the external air and to the Hen's body--two necessary conditions for its development. There is another reason for this polarity of the egg: the lighter and most delicate part of the yolk, the cicatricula, is collected where the upper cavity of the animal, inclosing the nervous system, is to be; while the heavy oily portion remains beneath, where the lower cavity, inclosing the organs of nutrition, is afterward developed. The essential parts of any egg are the germ-cell, or cicatricula, yolk, and vitelline membrane. The shell and albumen are often wanting. When the albumen is present, it is commonly covered by a membrane only, as in Frogs; in Sharks, the envelope is horny; and in Crocodiles it is calcareous, as in Birds. The eggs of all animals, in their essentials, are alike in kind, but not in degree. The egg of the Amoeba is a mere cell, with a light spot in one part of the contents. The egg of the Hydra differs in having this light spot sharply defined, and inclosed in a sac, or germinal vesicle. In the Rabbit's egg, there is another sac, called germinal dot, inside the germinal vesicle; while the eggs of most of the higher animals show a nucleolus within the germinal dot. An egg, therefore, closely resembles a cell, consisting of an outer and an inner sac and a dot, or a series of hollow concentric spheres. The size of an egg depends mainly upon the quantity of yolk it contains; and this is proportioned to the grade of development which the embryo attains when it leaves the egg.1." In the eggs of the Star-fishes, Worms, Insects, Mollusks (except the Cuttle-fishes), and Mammals, the yolk is very minute and formative, i.e., it is converted into the - par...


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Product Details
  • ISBN-13: 9781130450699
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 92
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1130450694
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 181 gr

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