Sun-spots and Terrestrial Phenomena. 



245 



if the middle of a lunation occurred, the lunation should be considered 

 a summer lunation, and the serial numbers of such lunations in 

 Table III are enclosed in parentheses to distinguish them from the 

 others, which are to be considered as those of winter lunations. The 

 average date of new moon will be about the 22nd of each month, and, 

 accordingly, in eliminating the residual effect of the annual variation 

 upon the lunar variations for the winter and summer half-years, the 

 beginnings of the several months have been taken to correspond with 

 the average time of first quarter of the moon, and the respective half- 

 years have been made to commence after the lapse of three-quarters 

 of the months of September and March. The numbers at the foot 

 of Table la having been curved on a large scale, the ordinates of the 

 curve were measured for every eighth of a month, and the averages 

 were taken of the six sets of eight numbers corresponding to the 

 winter lunations, and of the six sets corresponding to the summer 

 lunations. These were then multiplied by 1*069, the ratio of the 

 average scale of the 409 lunations to the scale of the period 1873 to 

 1880 (that is, of Table la), and the variations were then taken — with 

 the results that will now be made use of. 



The values of temperature-range found for the eight phases of the 

 winter lunations, of which there are 199, are — 





(0) 



(1) 



(2) 



(3) 



(4) 



(5) 



(6) 



(7) 







12-50 



12-54 



12-73 



12-89 



13-00 



12-92 



12-91 



13 -02 



(D) 



Correction applicable to win- 























+ -33 



+ -25 



+ •13 



- -01 



-•09 



- -15 



- -20 



- -24 



(E) 



Correct value of winter lunar 























12-83 



12 -79 



12-86 



12-88 



12-91 



12-77 



12-71 



12-78 



(F> 



and for the eight phases of the summer lunations, of which there are 

 210, they are — 





(0) 



(1) 



(2) 



(3) 



(4) 



(5) 



(6) 



(7) 







8-98 



8-89 



8-72 



8-69 



8-66 



8 -52 



8-42 



8-43 



(G> 



Correction applicable to sum- 























- -30 



-•21 



- -12 



-•04 



+ -04 



+ •12 



+ -20 







Correct value of summer 























8-68 



8-68 



8-60 



8'55 



8-70 



8-64 



8-62 



8-70 



(I) 



Fig. 3 represents the corrected variation for the summer months, 

 and fig. 4 for the winter months. The winter curve, like that of 

 Kew, is mainly a single period curve, and its maximum and minimum 

 phases both occur somewhat later than at Kew. The summer curve is 

 of smaller range ; again, like the corresponding curve at Kew, but 

 unlike the latter, it is a very regular double period curve. 



10. The excesses of the two series (F) and (I) above the series (A), 

 that is, the semi-annual inequalities of the lunar variations, are — 



