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THOMPSON'S COAST PILOT, 117 Rules for Barometrical Observation. Ist. There is no point at which the Barometer must stand to indicate rain or wind. 2d. The judgment must be governed by the rising or falling of the Barometer, 7 3d. 'The falling of the Barometer indicates the approach of a storm, the extent of which will be proportionate to the amount and rapidity of the fall. - Ath. Showers.--The Barometer falls previously from four to twelve-hundredths of an inch, varying in time, from one to three hours. The greater and more rapid the fall, the more violent will be the shower, accompanied more or less with wind, 5th. Northeasterly storms.--The Barometer falls previously from four to eight-tenths of an inch, varying in time from one to four hours, and continues falling until the storm arrives at its crisis, when the Barometer begins to rise and continues rising until that part of the storm which comes from the NW passes off. 6th. Southerly storms--The Barometer falls previously from one to fouretenths of an inch, varying in time from six to twelve hours. 'These storms generally precede unsettled weather; at such times the Barometer continues low, and very slight: additional de- pressions are followed by rain. A southerly storm is perhaps the most difficult to judge of by appearances, as appearances change so frequently without any real change in the atmosphere. During this class of storms, the utmost confidence should be placed in the Barometer. After the first indi- cation as above, and the Barometer does not rise, but remains stationary, it is strong indication that the storm has not all passed. The foregoing rules are the result of long and careful observa- tion. It must be remembered that storms occur under different cir- cumstances in different parts of the globe, yet, taking the first three of the above rules as a basis of calculation, a short experience, with the exercise of the judgment, will enable one to determine very cor- rectly concerning approaching changes in the weather.