WEATHEB. 151 



BAROMETER. 



The following rules may, in a certain degree, be 

 relied on as corresponding generally in the concomi- 

 tant changes in the barometer and the weather : 



1. Generally, the rising of the mercury indicates 

 the approach of fair weather ; the falling of it that 

 of foul weather. 



2. In hot weather the fall indicates thunder. 



3. In winter the rise indicates frost, and in frost 

 the fall indicates thaw, and the rise snow. 



4. If fair or foul weather immediately follow 

 the rise or fall, little of it is to be expected. 



5. If fair or foul weather continue for some 

 days, while the mercury is falling or rising, a con- 

 tinuance of the contrary weather will probably 

 ensue. 



6. An unsettled state of the mercury indicates 

 changeable weather. 



By these rules it will be seen that the words 

 engraved on the plate are frequently calculated to 

 mislead the observer. Thus, if the mercury be at 

 much rain, and rise to changeable, fair weather is 

 to be looked for. Again, if it be at set fair, and 

 fall to changeable, foul weather may be expected. 



