STONE BAROMETER.
A Finland newspaper mentions a stone in the northern part of Finland, which serves the inhabitants instead of a barometer. This stone, which they call Ilmakiur, turns black, or blackish gray, when it is going to rain, but on the approach of fine weather it is covered with white spots. Probably it is a fossil mixed with clay, and containing rock-salt, nitre, or ammonia, which, according to the greater or less degree of dampness of the atmosphere, attracts it, or otherwise. In the latter case the salt appears, forming the white spots.