The Physiology of the Invertebrata

The Physiology of the Invertebrata

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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. 1892 edition. Excerpt: ...In cold water, of which the great bulk of the ocean consists, the decomposition of nitrogenous organic matter is greatly retarded; whereas in tropical surface waters it proceeds with great rapidity. Here, then, we have probably the explanation of the massive structures formed by lime-secreting organisms in the coral reef regions, which are also the regions of highest and most uniform temperature in the ocean. In the same way we may account for the great extension of lime-secreting pelagic organisms in the tropical surface currents that flow north and south from the equator. Thus the coral reef-builders and pelagic organisms may not only benefit by the decomposition products arising from their own effete matters, but also from the undecomposed nitrogenous matter carried to equatorial regions from the cold water of the deep sea or from the polar regions." (/) As the quantity of carbonate of lime in sea water is 1 exceedingly small, it was supposed that the lime-secreting organisms pumped enormous quantities of sea-water through their bodies so as to be able to separate out a sufficient quantity to form their shells and skeletons. But there is no doubt that we have a correct explanation in the reactions indicated above which have been so ably investigated by Murray and Irvine. "In higher animals, like hens, the carbonate of lime is secreted from the blood; but in coral polyps, in which there is no true circulatory system, and where the animal is immersed in the sea water, it is most probable that the reaction above referred to--the formation of carbonate of ammonia--is in every way advantageous to these lime-secreting organisms, and facilitates the deposition of carbonate of lime by the protoplasm. In the case of all the more

Product details

  • Paperback | 148 pages
  • 189 x 246 x 8mm | 277g
  • United States
  • English
  • black & white illustrations
  • 1236788311
  • 9781236788313