Abstract
Inhibition of luminescence of photogenic material by light is not a general phenomenon. Ctenophores remain the best known case, but in the author''s experience pennatulids and medusae show no inhibition. Cypridina extracts are inhibited if they contain oxygen and the inhibition seems to consist of an oxidative destruction of photogenic substance. The author has never observed an animal that would fail to luminesce in the daytime provided it had been kept in darkness for a few hours previously. Flagellates and copepods should be studied further to test the question of day-night rhythm of luminescence.

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