Nature of the Effect of the Sun-spot Frequency. 



TABLE XII. 

 A"X. 



Unit ly. 



309 



Cape of 

 Good Hope 

 Hours 

 (Astro- 

 nomical). 



I. 



§ +34 min. 



& o 



— 4-2 

 —10-3 



2 



—20-0 



3 



—20-7 



4 



— 5-5 



5 



5-5 



6 



— 1-7 



7 



_ 3-2 



8 



— 5-7 



9 



— 3-3 



10 



3-3 



11 



6-1 



12 



— 2-1 



13 



— 6-2 



14 



— 8-7 



15 



— 5-3 



16 



8-1 



17 



1-2 



18 



8-2 



19 



23-2 



20 



28-2 



21 



23-7 



22 



1-3 



23 



7-9 



II. 



22 

 13 



- 5 



- 5 



- 7 



- 4 



- 2 



- 2 



- 3 



- 7 



- 4 



- 3 



-16 

 6 



- 5 



- 4 



- 8 

 -10 



- 1 

 1 

 3 



25 

 13 



III. 



15 

 8 



- 4 

 1 

 5 



- 5 

 7 



2 



- 2 

 6 

 3 

 1 



- 1 



- 3 



- 7 



- 5 



-12 



-12 

 -22 

 15 



8 

 13 



[V. 



18 

 14 



- 4 



- 5 



- 4 



- 1 



- 2 



- 3 

 1 



- 2 



- 7 



- 7 



- 9 



- 3 



- 3 



- 3 

 -10 



- 1 



4 

 14 

 19 



V. 



1 



- 4 

 -13 

 -12 

 -10 



- 2 



- 2 



2 

 5 



9 



5, 

 8 

 1- 



6 

 9 

 7 

 7 

 9 



VI. 



11 



17 

 4 

 7 



- 2 

 6 



- 1 



- 7 



- 4 



- 5 



- 5 



- 4 

 3 

 2 



- 5 



- 3 

 1 



- 1 



- 3 



- 1 



- 8 



- 1 

 11 



VII. VIII. 



IX. 



18 

 7 



- 3 



- 3 

 22 

 11 

 13 



6 

 11 



8 

 14 



- 8 



- 7 

 -11 



- 8 

 -16 

 -25 

 -21 

 -18 

 -18 

 -10 



1 

 10 



32 



- 6 

 3 



13 



- 4 



- 4 

 4 



- 6 



- 1 

 -11 



7 



- 2 

 10 



- 3 



- 3 



- 1 

 8 

 4 

 4 



-13 

 -20 

 43 

 37 

 37 



9 

 -11 



-18 

 -28 

 -19 



- 1 



- 1 

 4 

 5 



18 



12 



2 

 5 



1 



- 2 



- 2 

 -13 



- 8 



- 3 



- 7 

 25 

 27 



x. 



XI. 



- 5-8 

 -11-6 



5 



4 



3 







1 



4 



9-0 



3-8 



13 



4 

 4 



7 

 7 



- 2 



- 1 

 3 

 4 



5 

 3 



2 



2 

 1 

 2 



- 2 



- 5 



- 3 

 6 



4 

 5 

 9 



15 



- 9 

 10 



3 



XII. 



16-9 

 -12-9 



- 3-8 



- 4-5 



- 5-5 

 1-0 



- 2-3 



- 2-6 

 1-0 

 4-7 

 2-4 



- -9 



- -4 

 4 

 4 

 2 

 7 

 3 

 4 

 7 



- 2- 



- 3- 



- 2- 



- 5- 

 5" 

 9' 



17- 



20-0 



15-0 



5-4 



9-9 



§ 5. Discussion of He suits. 



At the outset it is well to observe that the period over which the 

 observations extend is unavoidably limited. In dealing with sun- 

 spot effect it is advisable to consider at least one eleven-year period, 

 so that it is difficult to say whether the various results I have 

 obtained are truly representative of the average conditions for a 

 whole sun-spot period; however, as far as comparison with other 

 results of a similar nature is possible, they do not appear to be 

 exceptional. 



An examination of the tables shows that there is a marked resem- 

 blance between the variation of the daily inequality A and A'. This 

 resemblance is noticeable in all the elements considered. On the 

 other hand A" shows very great irregularity. This may possibly be 

 in part due to the shortness of the period under consideration. 

 Chree, in Phil. Trans, of the Royal Society of London, points out 

 that there are two maxima and minima in the daily inequality of the 



