24 



east, the thaw will continue ; if the wind be south-west, 

 the frost will be likely to return with a rising barometer 

 and northerly wind. 



Great depressions in the summer months are attended 

 with storms of wind and rain with thunder and hail : 

 cold unseasonable weather generally succeeds these de- 

 pressions. 



Great depressions at all seasons are followed by 

 change of wind, and afterwards by much rain. 



During a period of broken cold weather in the winter 

 months, with the wind at north or north-north-west, 

 a sudden rise of the mercury denotes the approach of 

 rain and a southerly wind. 



During a steady frost with the wind at north, north- 

 east, or east, a continued slow rising of the mercury 

 indicates snow and cloudy weather. 



If the mercury rise with the wind at south-west, 

 south, or even south-east, the temperature is generally 

 high. 



Great elevations in the summer are attended with dry, 

 warm weather. 



A rising barometer with a southerly wind is usually 

 followed by fine weather. In the summer it is dry and 

 warm ; in the winter dry with moderate frosts. This is 

 of rare occurrence. 



When the mercury is very unsteady during calm 

 rainy weather, it denotes that the air is in an electrical 

 state, and that thunder will follow. 



In the summer months, if a depression of two or three 



