2 



A New Method of Treating 



stances The observations from an individual station are of very 

 restricted application and in their details are only representative 

 for a very small area, but, by combining the reports from a 

 number of stations, values are obtained which maybe looked upon 

 as representative for a much larger region. The boundaries of 

 the several districts are shown in the accompanying map (Fig. i) . 



FIG. I. 



Each district contains a number of observing stations, varying 

 from n in District 4, " Midland counties," to 5 in District 6, 

 " Scotland West." (In District 11, " English Channel," which 

 includes the Stilly Islands as well as the group of islands known 

 as the Channel Islands, there are three stations). The stations 

 are selected so as to be as far as possible uniformly distributed 

 over the district and to represent the varying physical conditions 



