202 



PRESSURE. 



station. The means of the four values for each month were taken and then smoothed by 

 From these smoothed monthly means the departures for each of the 



the formulae 



a+2b-t-c 



forty-eight months were calculated. 



The departures for the twenty-four months February 1902 to January 1904 were then correlated 

 with the corresponding values for McMurdo Sound, then the departures for the twenty-four months 

 January 1911 to December 1912, and finally the two series were combined to give the 

 correlation for forty-eight months. 



The following table contains the results, and the correlation factors for the whole period 

 are shown on the map, figure 61 : — 



Table 121. 



Correlation coefficients of monthly pressure departures from normal between McMurdo Sound and 



31 stations mainly in the southern hemisphere. 



