Translated by Arthur Stanton from the Proceedings of the Physical Society of Berlin.

In consequence of my measurements of Kerr's magneto-optical phenomena, the thought occured to me whether the period of the light emitted by a flame might be altered when the flame was acted upon by magnetic force. It has turned out that such an action really occurs. I introduced into an oxyhydrogen flame placed between the poles of a Ruhmkorff's electromagnet, a filament of asbestos soaked in common salt. The light of the flame was examined with a Rowland's grating. Whenever the circuit was closed both D lines were seen to widen.

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