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A Course of Practical Instruction in Elemetary Biology

A Course of Practical Instruction in Elemetary Biology


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About the Book

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. 1875 Excerpt: ...cold. The process of yelk-division, which commences within a few hours of impregnation, is readily observed when the eggs are examined as opaque objects under a low power of the microscope. "While still within the egg the embryo assumes the form of a minute fish, devoid of limbs and with only rudiments of gills, but provided with two adhesive discs on the ventral side of the head behind the mouth. After leaving the egg, the young acquires three pairs of external branchice having the form of branched filaments, attached to the sides of the hinder part of the head. Narrow clefts in the skin at the roots of the branchiae lead into the back of the throat. Water taken in at the mouth passes out by these branchial clefts. The animal crops the aquatic plants on-which it lives, by means of the horny plates with, which its jaws are provided. In the Tadpole, as the larval Frog is called, the intestine, which is relatively longer than in the adult, is coiled up like a watch-spring in the abdominal cavity. A membranous lip, the surface of which is beset with numerous horny papillae, surrounds the mouth, and the muscular tail acquires a large relative size. The eyes, the nasal and auditory organs become distinct, but no limbs are at first visible. A fold of the integument in the hyoidean region, called the opercular membrane, now grows back over the external gills and unites with the integument covering the abdomen, leaving only a small aperture on the left side, through which the ends of the external gills of that side may, for some time, be seen to protrude. The external gills atrophy and are succeeded functionally by short processes developed from the opposing faces of the branchial clefts--the internal branchice. The rudiments of the limbs appear, rapidly elong...


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Product Details
  • ISBN-13: 9781154673180
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 82
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1154673189
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 163 gr


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