Mr. P. Christensen, of Cowes, in the Isle of Wight, Lecturer upon Astronomy, etc, has arranged a table, which no one having a weatherglass should be without. This "Companion to the Barometer" is the result of thirty-two years' observation, and the following is an epitome of the information it gives. During the first six months of the year, when the mercury is rising, if the weather has been bad, and the mercury reaches to 29.62 inches, there will be a change; if to | 30.12, the weather will be fair; if to 30.29, set fair. If the mercury has been high, and begins falling, there will be a change if it declines to 29.90; rain, if it descends to 29.50; and wind, with rain, if it reaches 29.12.

During the last six months of the year, if the weather has been foul, and the mercury begins rising, there will be a change if it reaches to 29.48; fair if to 30.13; and set fair if to 30.45. If the weather has been fair, and the mercury begins falling, there will be a change if it sinks to 29.87; rain, if to 29.55; and wind with rain, if to 29.28. At any time of the year, if the mercury fall to 28.10, or even to 28.20, there will be stormy weather. These conclusions are from observations made at thirty feet above the sea's level, and therefore one one-hundredth part of an inch must be added to the height of the mercury for every additional ten feet above the sea's level, where the barometer may happen to be.