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Life and Evolution

Life and Evolution


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About the Book

This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1906. Not illustrated. Excerpt: ... kickshaws that they may be able to sweep into their insides. But if the tank is jarred the stem and branches contract, and there is an instantaneous collapse, then a comparatively slow re-expansion, to see if the coast is clear again. Here was a chance for experimenting. When the tank has been jarred three or four times, and each jar has been followed by an instantaneous withdrawal and then a re-expansion, the zoothamnium begins to realise that there is no danger, and no longer withdraws, or at any rate requires a much more violent shock, or a number of quickly-repeated shocks, to make him retreat. He learns by experience that the jarring does not mean that there is any danger at hand. Even in such simple organisms there are varieties of individual character.1 I speak of a colony of zooids as an individual, because it generally acts as a whole as if controlled by a centralised nervous system. Some individuals are much less sensitive than others. From the very first they take little notice of a jar. In some, one branch of the tree is more sensitive than the rest--a want of centralisation. Of one, I have noted that one part seemed to have a longer "memory" than the rest. This part "remembered" for a minute or so that shocks meant nothing, and did not withdraw. From such experiments we cannot help concluding that these colonies of unicellular zooids are capable of learning by experience. Usually it is the collective colony, occasionally part of the colony separately. And further, we cannot help inferring that one-celled organisms that do not live in colonies have a power of learning not greatly, if at all, inferior to that of zoothamnium. On this subject I would refer my readers to Mr Jennings' book on The Study of the Behaviour of Lower Organisms, where he shows t...


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Product Details
  • ISBN-13: 9781150906497
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 100
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1150906499
  • Publisher Date: 01 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 195 gr


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