410 



METEOROLOGY. 



but rather tends, by constantly renewing and intermingling the different 

 columns of moving air, to distribute the heat equally through town 

 and country. 



What a decided influence the different conditions of the sky and the 

 motion of the atmosphere have upon the differences of temperature 

 between town and country, appear in a striking manner on comparing 

 the mean numbers of each of the five classes in the annexed table. 

 While the mean number of class No. 1 is 3°. 9, that of class No. 2 is 

 1°.8; of class No. 3, 1°.4, of class No. 4, 1°.3; and but 0°.5 in class 

 No. 5. 



FIBST CLASS. 



Containing all the cases wliere a clear shy (cloudiness not exceeding 2) 

 exists in connection ivith a calm atmosphere, or very light breezes of 

 velocity 1. 



