Calendar of Nature, 



295 



Art. III. Calendar of Nature, 



Scotland. 



Diagram {fig. 80.), showing the Motion of the Mercury in the Barometer and 

 Thermometer, and the Dew Point, or the Mean of each, for e^^^ery Ten 

 Days in the Months of February and March ; also the Mean Temperature 

 of the Air within 6 in. of a South Brick Wall, commencing on the 1st of 

 March, the Thermometer being shaded ; and the Depth of Rain in the 

 Pluviometer, and the Quantity of Moisture evaporated in the Evapo- 

 rating Gauge during the same Period; as extracted from the Register 

 kept at Annat Gardens, Perthshire, N. lat. 56° 23^^ above the level of 

 the sea 172 ft., and 15 miles from the coast, being the mean of daily 

 observations at 10 o'clock morning and 10 o'clock evening. 



80 



The lines marked h show the motion of the mercury in the barometer, 

 ^ « m; the mean temperature of the air near a south garden wall, t the mean 

 temperature in the open air, and d the dew point. 



The coldest day in February was the 6th : mean temperature of that 

 day 25° ; extreme cold 24° ; wind easterly. The warmest day was the 26th : 

 mean temperature of that day 51*5°; extreme heat 56°; wind south-west. 

 There were 5 days of brilliant, and 7 of partial, sunshine ; 16 were cloudy. 



