176 DR. C. CHKEE: AN ENQUIRY INTO THE NATURE OF THE RELATIONSHIP 



inequality for the year, I have employed both the method of least squares and the 

 method of groups. If large differences had presented themselves between the results 

 from the two methods, it would have become necessary to reconsider Table XVIII. 

 As the question of the reliance to be placed on the method of groups is important, 

 I give the results from both methods in Table XIX. The agreement, it will be seen, 

 is least good in D, but it will, I think, be allowed that even there it leaves little to 

 be desired. 



TABLE XIX. Batavia (Units 1' in D and I, ly in Forces). 

 Mean Diurnal Inequalities for the Year. 



29. In the case of I, H and V the values of a, b and b/a given in Table XIX. for 

 the sum of the 24 differences in the mean diurnal inequality for the year do not differ 

 much from the yearly mean in Table XV1I1. In the case of D, however, the results 

 in the two tables are widely different, the a in Table XVIII. being nearly 40 per cent, 

 in excess of that in Table XIX. The closeness of the values of in the two tables in 

 I, H and V, and their divergence in the case of D, is what we might anticipate from 

 the figures for the sums of the 24 differences in the last two lines of Table XVII. 

 The real inference to be drawn is that in I) the hours of maximum and minimum vary 

 somewhat widely from month to month, though apparently to a smaller extent in 

 years of sun-spot maximum than in years of sun-spot minimum. 



The data in Table XIX. for Batavia correspond exactly to those given for Kew 

 in (A), Table XLIV. 



In D the Batavia value of b for the 24 differences is almost exactly the third of the 

 Kew value ; in. the case of the ranges the Batavia value is relatively larger, but still 

 less than half that at Kew, Greenwich or Pawlowsk. 



The D values of b/a, however, at Batavia and Kew are nearly equal. 



In I the Batavia value of 6 is 70 per cent, larger than the Kew in the case of the 

 ranges, and almost exactly double in the case of the 24 differences. The Batavia 



