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Show Death for Bacteria. Ilurterla that survive In suullgl't art killed by the ultra-violet rays from mercury vapor lamps wllh ipixrtx tubea. Two French Investigators report re-port that tbe killing Is not due to the formation of hydrogen peroxide or other chemical poison, but to the direct di-rect action of ultra-violet rsys of ex tremely short wave-length. Huch rays, abundant In artificial light from the quarti lamps near at band, are filtered from sunlight by passage through the atmoapbere. |