W.GOETSCH, of Munich, has carried out a series of experiments on Hydra, and has published the results in some half-dozen short papers, two of which form the subject of this notice (Die ...
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 ...
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