METEOROLOaY. 165 



In the use of the barometer it is usually the fall which 

 gives the warning, but sometimes the rise indicates the 

 approach of a storm. For example : Suppose that in this 

 city the barometer has for a short period indicated a state 

 of apparent rest in the atmospheric pressure. Now, say 

 it begins to rise above its average height, there must be 

 a low barometer at the West. After a few hours the 

 barometer begins to fall; the centre of the storm, or line 

 of minimum j)ressure, is approaching; the wind blows 

 gently from the Eastward; the barometer continues to fall, 

 and the wind increases in force until nearly the time that 

 the centre of the storm passes over the observer, then there 

 is a lull of the wind for a short time. After the centre of 

 the storm has passed, the wind changes and blows strong 

 from the Westward, and the barometer begins to rise, and 

 continues rising until it jpasses above, and then falls again 

 to about its average height. The M'ind in the mean time 

 dies away to nearly a calm, to be all'ected by local causes, 

 until another storm is started. 



In this instance the storm would be indicated first by the 

 the 7'ise of the barometer. Should one storm immediately 

 follow another, the rise after the passage of the first storm 

 might occur at the same time that the rise should occur on 

 the approach of the second storm. In that event, the 

 approach of the second storm would only be made appa- 

 rent by the fall of the barometer below its general average 

 height. 



Should the barometer fall suddenly, and to a low i^oint, 

 very strong winds would be expected, and probably a great 

 amount of rain or snow. 



The occurrence of a low temperature, accompanied by 

 frost, at a time other than immediately after the passage 

 of a storm, would be a very sure indication of the approach 

 of a storm. 



The foregoing is submitted for examination and consid- 

 eration, with the hope that many will interest themselves 



