23 



high winds from the south-west come with a falling 

 barometer. 



If the depression of the mercury be sudden and con- 

 siderable with the wind due west, a violent storm may 

 be expected from the north-west or north, during which 

 the mercury will rise to its former height. 



If the mercury fall with the wind at west, north-west, 

 or north, a great reduction of temperature will follow ; 

 in the winter severe frosts, in the summer cold rains. 



A steady and considerable fall of the mercury during 

 an east wind denotes that the wind will soon go round 

 to the south, unless a heavy fall of snow or rain imme- 

 diately follow; in this case the upper clouds usually 

 come up from the south. The deep snow of the severe 

 winter of 1814 was a notable instance. 



The lowest depressions occur with the wind at south 

 and south-east, when much rain falls, and frequently 

 short and severe gales blow from these points. In the 

 winter months, sudden depressions of the mercury with 

 the wind in these quarters are attended with electrical 

 phsenomena. 



A fall of the mercury with a south wind is invariably 

 followed by rain in greater or less quantities. 



A falling barometer with the wind at north brings 

 the worst weather : in the summer, rain and storm fol- 

 low ; in the winter and spring, deep snows and severe 

 frosts. This case is of rare occurrence. 



A great depression of the mercury during a frosty 

 period brings on a thaw : if the wind be south or south- 



