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Show Fish Know Colors. "Fish know colors?' snld a keeper at the New York Aquarium the other day. "They can distinguish between red nnd blue, or white and green, as well as you and I. Walt and I'll provo It." He led the way to a tank In which were some red and some yellow and somo green fish, nnd In It wero artificial arti-ficial grottoes painted respectively red nnd yellow and green. Tho lxeper rolled tho water with his hand, and tho flsh (led, the red ones to tho rod grotto, the yellow ones to the jellow grotto, and the green ones to the gieen grotto. "They know which color shields them from observation best," said he. "Now I'll change tho grottoes, so as to prove my stntem'ent n second time." He moved tho grottoe to different places In the tanks and again rolled tho water. The siiinc thing followed ns before. Each flsh darted like n shot to tho giotto of Its own color, where It know It would be bast concealed. |