1(58 DR. C. CHEEE: AN ENQUIRY INTO THE NATURE OF THE RELATIONSHIP 



The b/a variation throughout the year proceeds most regularly when we use the 

 observed frequencies. 



TABLE XL Pawlowsk. 

 Variation of b and b/a throughout the Year. 



Katharinenburg (5G 49' N. lat,, GO 38' E. long.). 



20. Table XII. gives values of a, b and b/a for the range of the diurnal inequality 

 for each month of the year, and arithmetic means for the seasons and the year, at 

 Katharinenburg, corresponding exactly to the " all " day results for Pawlowsk given 

 in Table V. 



In D, 7; appears decidedly less at Katharinenburg than at Pawlowsk, especially in 

 winter. The dip in the December and January values of b in Table XII. is 

 particularly striking. The summer and equinoctial values of b/a at Katharinenburg 

 are very similar to those at Kew and Pawlowsk, but the winter value is much less, 

 owing to the low values in December and January. 



In H the mean b for the year is close to the Kew value, but the winter values 

 of b and b/a are distinctly lower than at Kew and Pawlowsk. 



In V, Katharinenburg occupies an intermediate position between the " all " and the 

 " quiet " day results for Pawlowsk The mean value of b for the year in Table XII. 

 is little over half the corresponding " all " day value at Pawlowsk, but it is more than 

 thrice the " quiet " day value at Pawlowsk, and double that at Kew. 





