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A Course of Practical Instruction in Elementary Biology

A Course of Practical Instruction 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. Excerpt from book: Section 3III. THE PROTEUS ANIMALCULE textit{(Amaba). COLOURLESS BLOOD CORPUSCLES. textit{Amoeba are minute organisms of very variable size which occur in stagnant water, in mud, and even in damp earth, and are frequently to be obtained by infusing any animal matter in water and allowing it to evaporate while exposed to direct sunlight. An textit{Amoeba has the appearance of a particle of jelly, which is often more or less granular and fluid in its central parts, but usually becomes clear and transparent, and of a firmer consistency, towards its periphery. Sometimes textit{Amoeba are found having a spherical form and encased in a structureless sac, and in this encysted state they exhibit no movements. More commonly, they present incessant and frequently rapid changes of form, whence the name of textit{Proteus Animalcule given to them by the older observers; and these changes of form are usually accompanied by a shifting of position, the textit{Amoeba creeping about with considerable activity, though with no constancy of direction. The changes of form, and the movements, are effected by the thrusting out of lobe-like prolongations of the peripheral part of the body, which are termed textit{pseudopodia, sometimes from one region and sometimes from another. Occasionally, a particular region of the body is constantly free from pseudopodia, and therefore forms its hindmost part when M. a it moves. Each pseudopodium is evidently, at first, an extension of the denser clear substance textit{(ectosarc) only; but as it enlarges, the central, granular, more fluid substance flows into its interior, often with a sudden rush. In some textit{Amaba a clear space makes its appearance, at intervals, in a particular region of the ectosarc, and then disappears by the rapid approach of its walls. After a while, a sma...


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Product Details
  • ISBN-13: 9781443263283
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Language: English
  • ISBN-10: 1443263281
  • Publisher Date: 06 Jul 2009
  • Binding: Digital (delivered electronically)
  • No of Pages: 188


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