TEMPERATURE OF SWEDEN. 



119 



III. — Temperature of the Earth and op the Air at Upsai, lat. 59° 52' ; 

 ON the averaoe op 8 tears, 1838 — 1845. (Calculated from data in a 

 M6mowe sw la TempSratwre de la Terre a Upsai, par A. J. Angstirom.) 



Notwithstanding the intensity of the Scandinayian winters, it appears 

 that the thermometer at two feet deep falls very little below freezing, 

 although the mean temperature of the air is far below that experienced 

 in this country in the most severe winters. The difference between the 

 temperature of the earth at 2 feet and 3 feet 10 j inches, on the average, 

 and that of the air, is no less than 13-37° in the month of February. 

 This great difference is doubtless owing to radiation of heat from the 

 earth being prevented by a covering of snow. From April till August, 

 the air, as at Chiswick, is warmer than the earth. 



