Abstract
By means of light of constant intensity the lower surface of flounders was illuminated. Pigment formed on the lower surface among unoperated fishes in black tanks lighted from below; and blinded dark fishes in black tanks lighted from below or in white tanks lighted from above. Fish blinded in the dark phase developed ventral pigment as readily as unoperated ones; hence the eyes are not essential in this reaction. Light is necessary for the formation of ventral pigment.

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