Abstract
The author stated, as the results of some experiments which he had made on the phosphorescence of a species of Beröe (Idyia) which abounded during the last summer in the Firth of Forth, that the light is never emitted as long as the animal is exposed to daylight; and that withdrawal from the daylight for some time is necessary, in order to impart to the Beröe the property of phosphorescence.

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