Abstract
IN NATURE of April 7 a short account is given of the interesting experiments made by Goetsch on the conversion of the green Hydra into a pale Hydra. Some years ago I observed what may be called a natural experiment of the same kind. At the south end of the tunnel that conducts the water supply of Manchester from Lake Thirlmere under Dunmail Raise to the Grasmere valley there is a small settling tank, and on the walls of this tank I found a very large assembly of milk-white Hydras. An examination with a pocket lens led me to the conclusion that they were only a white variety of the common Hydra viridis, and were probably the offspring of parents living in the tunnel. These white Hydras were evidently enjoying the full vigour of life.
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HICKSON, S. Green and Colourless Hydra. Nature 111, 601 (1923). https://doi.org/10.1038/111601a0
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DOI: https://doi.org/10.1038/111601a0
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