Abstract
A PHENOMENON of dichromatism in Euglena precisely similar to that described by Prof. Arthur Dendy in NATURE of August 7 was recorded by me in The Essex Naturalist in 1890 as occurring at Donyland Heath, near Colchester. During July and August the surface of the largest pond on the heath was almost completely covered with a film which was red in the morning and turned to green in the afternoon. I watched the change take place on August 3 at noon, the transformation taking about half an hour. The omen of blood was viewed with some alarm by the superstitious in the village, and was held to betoken some ill for the community. After the heavy rains of August the pond was quite clear of the film, and no earthquake occurred.
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BENHAM, C. A Red-water Phenomenon due to Euglena. Nature 91, 607 (1913). https://doi.org/10.1038/091607c0
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DOI: https://doi.org/10.1038/091607c0
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