TO J< DGE OF THE BAROMETER. 197 



3. In very hot weather the falling indicates 

 thunder. 



4. In winter the rising presages frost; and in 

 frosty weather, if the mercury falls three or four 

 divisions, a thaw ; but in a continued frost, if it 

 rises, it will certainly snow. 



5. When foul weather happens soon after the 

 falling of the mercury, expect but little of it; 

 and on the contrary, expect but little fair wea- 

 ther, when it proves fair shortly after the mer- 

 cury has risen. 



(j. In foul weather, when the mercury rises 

 much and high, and continues so for two or 

 three days, before the foul weather is quite over, 

 then expect a continuance of fair weather to 

 follow. 



7. In fair weather, when the mercury falls 

 much and low, and continues so for two or three 

 days, before the rain comes then expect a great 

 deal of wet, and probably high winds. 



8. The unsettled motion qf the mercury, de- 

 notes changeable weather. 



Q. If the mercury stands at much rain, and 

 then rises up to changeable, it presages fair wea- 

 ther, although not to continue so long as it 

 would have done if the mercury were higher: 

 So, on the contrary, if the mercury stood at fair, 

 and falls to changeable, it presages foul weather; 

 but fouler if it sinks down lower. 



But to these remarks it may be added, that 

 when the Barometer suddenly falls two or three 

 tenths, without any material alteration in the 

 Thermometer, and the Hygrometer is not much 

 turned towards moist, a violent gale of wind 

 jp ay be ex pec ted. 



When the hygrometer inclines far towards 

 xnoist, with only a trifling descent in the Baro- 

 s 3 



