ABSTRACT
Classical accounts of the effect of coloured light on retinal pigment migration in frogs and crayfish have been reviewed by Parker (1932). Most of those results agree in indicating violet or blue as the most effective light. Zetter (1956) has shown that the light of wavelengths near to 540 m/x is most effective for the expansion of melanophores in frog’s skin. On the other hand, the direct effect of light upon the iris, which responds like melanophores, shows that 486 mμ is the most effective wavelength (Weale, 1956).
Copyright © 1957 The Company of Biologists Ltd.
1957
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