Abstract
AS a result of observations and experiments carried out on ponds built for the purpose, and by the use of apparatus for observing organisms in their natural environments, I have arrived at certain conclusions as to the value of reflection as a concealing factor in various forms of aquatic and subaquatic life. The general principle upon which these ponds are built is as follows:—In one bank of the pond is a glass window, and beyond this window an underground observation chamber. No light enters this chamber except through the surface of the water. By this means everything in the pond is seen by entirely natural illumination, the observer cannot be detected, and as there is no reflection from the glass the making of photographic records is greatly simplified. In the first pond, built for the observation of objects in the water, the glass is perpendicular. In the second, for observing objects on the surface, the glass is at an angle of 45° to the surface.
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Reflection as a Concealing and Revealing Factor in Aquatic and Subaquatic Life 1 . Nature 91, 596–599 (1913). https://doi.org/10.1038/091596b0
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DOI: https://doi.org/10.1038/091596b0