218 OBSERVATIONS ON THE MEAN TEMPERATURE 



The differences in this Table (amounting at an average to 

 Tib) are far within the limits of the errors of observation ; but 

 being negative in general, they may be reduced still farther to 

 an average of 1°, by supposing the Asiatic Pole to have the 

 temperature of + 1° of Fahrenheit, which is 4}' warmer than 

 the Transatlantic Pole. The Formula in this case becomes 



T = 81.8° Sin. D + 1°, 

 from which we obtain the following results : 



In 



