Sun-spots and Terrestrial Phenomena. 247 



and 





(0) 



(1) 



(2) 



(3) 



(4) 



(5) 



(6) 



(7) 



Winter variation (maximum 



















period) corrected for (E) 



12-14 



12-35 



12-51 



12-31 



12 -44 



12 "22 



12-04 



12-15 





12-83 



12-79 



12-86 



12-88 



12-91 



12 -77 



12-71 



12-78 



Supposed effect of solar 





















- -69 



- -44 



- -35 



i 





-•47 



— *55 



- -67 



-•63 



13. For the sake of comparability with Dr. Stewart's results for 

 Kew, which may possibly refer to winters a year later in every case 

 than those named above, we have repeated these calculations on that 

 supposition, and have obtained, in lieu of series (N) and (P) the 

 following : — 







(0) 



(1) 



(2) 



(3) 



(4) 



(5) 



(6) 



(7) 





Supposed effect of 



solar 



















m 







- -10 



- -21 



- -34 



-•45 



-27 



— -25 



- -12 



•00 



Supposed effect of 



solar 

























-•58 



- -443 



- -41 



- -63 



- -53 



- -38 



- -52 



-•51 





The series (N), (N'), (P), (P') are curved in figs. 9 to 12. Con- 

 trary to the Kew series, they show that the temperature-range is 

 somewhat less when sun-spots are excessive than when they are 

 defective, the mean values of the several series being —'17, —'21, 

 — '54 and — *50 respectively. Figs. 9 and 10 are much alike, and 

 imply that the general winter lunar variation found in this way is 

 subject to a pronounced change of character during the time of 

 deficient sun-spots, having superimposed upon it a variation of single 

 period and of greater range than its own. This affords a partial 

 explanation of the great difference between the curves of winter 

 lunar variations for the first sixteen and last seventeen years (figs. 5 

 and 6), the latter period being made up of years of deficient sun-spots 

 in greater degree than the former period. 



" Sun-spots and Terrestrial Phenomena. II. On the Variations 

 of the Daily Range of the Magnetic Declination, as re- 

 corded at the Oolaba Observatory, Bombay." By Charles 

 Chambers, F.R.S., Superintendent. Received May 30. 

 Read June 15, 1882. 



The present, like the preceding, investigation is on the model of one 

 by Dr. Balfour Stewart, dealing with similar records obtained at the 

 vol. xxxiv. s 



