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A System of Synthetic Philosophy Volume 4

A System of Synthetic Philosophy Volume 4


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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. Excerpt: ...inferior types of animals, as for instance the Hydra. In the second place, the Hydra habitually shuns the light--habitually chooses the dark side of the vessel in which it is placed. May we not infer that the sensitiveness to light which the Hydra exhibits, results from the action of light on its contained chlorophyll; that as in plants, this action is one through which the components of chlorophyll are assimilated; and that thus, the power which the primordial tissue possesses to distinguish light from darkness--a power which forms the germ of the visual faculty--is due to a modification produced by light on the general vital processes? Any doubt that may be felt respecting this hypothesis, will, I think, disappear on remembering that even in ourselves the general surface of the body retains a physiological sensitiveness to light. The darkening of the skin caused by long exposure to sunshine, implies a modified assimilation in the tissue penetrated by light--a change in the absorption of materials supplied by the blood. In transparent and semi-transparent creatures, any such photogenic effect must pervade the whole body; and if so it is easy to understand how light may produce marked changes in such creatures. That hearing has, like the other senses, a root in the primitive vital functions, there is little if any direct evidence. But for suspecting that it, too, is differentiated from them, we have the reason that to sound, as to light, the whole animal organism in its simplest forms possesses a feeble susceptibility. A slight tap, causing a vibration to pass through the vessel containing them, is responded to by creatures in whom no sign of an auditory organ exists. And if wo call to mind tho facts that congenitally deaf persons are acutely affected by sonorou...


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Product Details
  • ISBN-13: 9781236041784
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 198
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 123604178X
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 363 gr


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