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Contributions from the Bermuda Biological Station for Research (Volume 4, No.52-76)

Contributions from the Bermuda Biological Station for Research (Volume 4, No.52-76)


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...the incident light. This is shown by the facts, (1) that the rate of light reduction is a factor in the stimulus, for, to be successful in producing the reaction, shadows had to have a sharp edge, (2) that with two sources of light--e. g., a flash light and a lamp--extinguishing one of them was under certain circumstances a stimulus for the shadow reaction1), and (3) that the amplitude of the reaction varied directly with the intensity of the light from which the animals were shaded. No means was at hand for expressing the last relation quantitatively. Another aspect of the shadow reaction is the converse of the familiar colored-light problem in phototropism: Is the shadow reaction initiated by the cutting out of any particular set of wave lengths? No conclusive experiments were made with Holothuria, but with Balamts it was found that cutting out either the blue or green was sufficient to produce the typical shadow reflex. The colored lights were secured by the use of glass ray filters, so the intensity relations were not clearly evident; but to the human eye the blue glass was less transparent than the red. When the barnacles had reexpanded under the colored lights, cutting out the red or yellow produced no effect, while shading through the blue and green glasses gave typical reactions.2) The cutting out of the ultra-violet is certainly not a factor, as the shadow reaction was given under glass, and the sudden interposition of a glass plate between the holothurians and the sun produced no effect. 4. Discussion. Holothuria has been shown to be photokinetic, negatively phototropic when there is a horizontal component of the incident light, and to be reactive over its whole surface to rapid decrease in light intensity. No special organs of...


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Product Details
  • ISBN-13: 9781152882270
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 150
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1152882279
  • Publisher Date: 01 Apr 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 281 gr


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