Show death for bacteria that a t survive a I 1 el in n sunlight are killed by the he ultraviolet ultra violet rays from mercury vapor lamps with quartz tubes two french investigators report t that h at the killing Is not due to the formation of hydrogen peroxide or other chemical poison but to the direct diz action of ultraviolet ultra violet rays ot of e extremely Z short wavelength wave length such rays abundant in artificial light from the chartz lamps near at hand are from froin sunlight by passage through the |