1427. The rising of the mercury presages, in general, fair weather; and its falling foul weather, as rain, snow, high winds, and storms. The sudden falling of the mercury foretells thunder, in very hot weather, especially if the wind is south. The rising in winter indicates frost; and in frosty weather, if the mercury falls three or four divisions, there will follow a thaw: but if it rises in a continued frost, snow may be expected. When foul weather happens soon after the falling of the mercury, it will not be of long duration; nor are we to expect a continuance of fair weather, when it soon succeeds the rising of the quicksilver. If, in foul weather, the mercury rises considerably, and continues rising for two or three days before the foul weather is over, a continuance of fair weather may be expected to follow. In fair weather, when the mercury falls much and low, and continues falling for two or three days before rain comes, much wet must be expected, and probably high winds. The unsettled motion of the mercury indicates changeable weather.