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Show Effect of Darkness on Gold Fish. A scientist kept gold fish in a roomy tank and with plenty of food, but in absolute darkness, lie kept it up for three years, and then observed tho modifications that had occurred In tho fish. The color first became black, but after the second year it became golden again, and the reason for this Is interesting. inter-esting. In the first Instance the dark pigment cells spread out and covered the subjacent layer of crystals which gives the gold fish its golden si n. In the second instance the phagocytes devoured de-voured the dark pigment cells, and thus re-exposed the golden layer. The changes in the eye were even more in-terestil5g. in-terestil5g. The structure of the eye was completely altered. The fish became be-came totally blind. The experiment suggests that an individual lisli imprisoned impris-oned In a perfectly dark cave would become blind. But It does not throw any direct light on the origin of a blind race of fishes in caves. New York Morning Telegraph. |