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Gisler adds, that he has frequently heard the noise of the aurora, and that it resembles that of a strong wind, or the hissing that certain chemical substances produce in the act of decomposition.
Gisler, who for a long time dwelt in the North of Sweden, remarks that the matter of the aurorae boreales sometimes descends so low that it touches the ground; at the summit of high mountains it produces upon the faces of travellers an effect analogous to that of the wind. Dr.
Gisler says, that on the high mountains of Sweden the traveller is sometimes suddenly enveloped in a very transparent fog, of a whitish-gray color inclining a little to green, which rises from the ground, and is transformed into an aurora borealis.
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