Abstract
AN experiment with a double bulb of quartz containing mercury in vacuo and heated to a constant temperature, which showed fluorescence under illumination by the light of an aluminium spark only when one of the bulbs was cooled by an air blast, has been cited by one of us as proof that only distilling mercury vapour exhibits the phenomenon. This has been denied by Niewodnizanski, who obtained brilliant fluorescence in stagnant vapour.
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