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Show Fish Know Colors. "Fish know colors." said a keeper nt tie New York Aquarium tho other dm "They can distinguish between rod anil bluu. or white nnd sreon, as well as you nnd I. Walt and I'll prove It." He led tho way to a tank In which worti some red and some yellow and some green H4I1, nnd In It wqro nrtl-llcinl nrtl-llcinl grottoes painted rcppcctl'velj rod nnd yellow and green. The keeper rolled tho water with his hand, and tho flsh fled, tho red ones to tho red grotto, tho jellow ours to tho yellow grotto, nnd tho green ones to the green grotto. "They know which color shields them from observation best," ald ho. "N'nw I'll clinugo tho grottoes, so as to prove my statement n bccoiuI time." Ho moved tho grottoe tn different plact'H In the tanks and again rolled the wntcr. The same thing followed as before. Kiich flsh darted llko a chot to tho grotto of Its own color, whero It knew It would ho hast concealed. |