Papers from the Tortugas Laboratory of the Carnegie Institution of Washington Volume 17-18
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Papers from the Tortugas Laboratory of the Carnegie Institution of Washington Volume 17-18

Papers from the Tortugas Laboratory of the Carnegie Institution of Washington Volume 17-18


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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. 1922 Excerpt: ...mechanism developed is totally different in the two species, notwithstanding the fact that in structure the organ is identical in the two and in every detail except proportion the fish are very similar. In Anomalops, the organ is hinged at the antero-dorsal edge and can be turned downward until the light surface comes in contact with a fold of black-pigmented tissue forming a sort of pocket. The light is thus cut off. In Photoblepharon, a fold of black tissue has been developed on the ventral edge of the organ socket, which can be drawn up over the light surface like an eyelid, thus extinguishing the light. Why these two fish, so similar in most respects, and especially in the general structure of the luminous organ, should have developed such totally different means of extinguishing the light is a mystery. As observed by Steche, I find that the organ itself emits light continuously and steadily, in the day as well as at night. No amount of mechanical or electrical (strong interrupted induced shocks) stimulation causes any effect whatever on the intensity. In this respect it differs completely from all other animals and resembles the bacteria and fungi, which also produce a steady light independent of stimulation. One other fish, Monocentris japonica, with a paired light-organ at the tip of the lower jaw, behaves as do Anomalops and Photoblepharon. This peculiarity of steady light, independent of stimulation, should be borne in mind, as it has a very important bearing on the nature of the light of these fishes. In life, the light of Anomalops is constantly being turned on and off, according to Steche, 10 seconds light and 5 seconds dark. Photoblepharon in its natural environment shows its light continuously, but in glass jars, either as a result of partial ...


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Product Details
  • ISBN-13: 9781130123616
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 116
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1130123618
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 222 gr


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