246 Mr. C. Chambers. 





(°) 



(1) 



( 2 ) 



( 3 ) 





(5) 



( 6 ) 



(7) 







+ 2-14 



+ 2T2 



+ 2-19 



+ 2-15 



+ 2-14 



+ 2-11 



+ 2-10 



+ 2-12 



(J) 





-2-01 



-1-99 



-2-07 



-2-08 



-2-07 



-2-02 



-1-99 



-1-96 



(K) 



Curves representing the series (K) and (J) form figs. 7 and 8 

 respectively, and they are, necessarily, nearly opposite to each other 

 in character, and, like those of Kew, they are in the main single 

 period waves, but with the maximum and minimum phases occurring 

 later at Bombay than at Kew. 



11. The next two series (L) and (M) are the winter lunar varia- 

 tions for the periods 1847*75 to 1863"25 (sixteen winters), and 

 1863*75 to 188025 (seventeen winters) obtained in the same manner 

 as series (F). They are curved in figs. 5 and 6, which though 

 possessing little likeness to each other, have, of course, each points of 

 similarity with fig. 4. 



Phase of lunation 



(0) 



(1) 



(2) 



(3) 



(4) 



(5)* 



(6 



(7) 





Winter lunar f First 16 years... 



13-43 



13-58 



13-69 



13-79 



13-62 



13 -43 



13-46 



13-36 



(L) 



variation. | Last 17 years ... 



12-26 



12-03 



12 -06 



12-01 



12-23 



12-15 



12-00 



12 -23 



(M) 



It may be noted that the series (L) and (M) bear nearly the same 

 relation to the series (F) that the series (B) and (C) respectively 

 bear to the series (A), a fact which, combined with the knowledge 

 that the summer lunar variation is of small extent, implies that the 

 winter months contribute nearly the whole of the irregularity which 

 distinguishes one half of the period of thirty- three years from the 

 other. 



E. Possible Variation of the Lunar Effect ivith the Sun-spot Period. 



12. In order to examine the relation of the winter lunar variation 

 to the sun-spot period, the winters chosen as corresponding to the 

 minimum and maximum respectively, of solar activity, are 1854-55 to 

 1856-57, 1861-62 to 1866-67, 1872-73 to 1874-75, and 1857-58 to 

 1860-61, 1867-68 to 1871-72. These groups of winters give results as 

 follows : — 





(0) 



(1) 



(2) 



(3) 



(4) 



(5) 



(6) 



(7) 



Winter variation (minimum 





















' 12 -90 



12 -67 



12-49 



12-35 



12-54 



12 -62 



12-71 



12-89 





12-83 



12-79 



12-86 



12-88 



12-91 



12-77 



12-71 



12-78 



Supposed effect of solar 





















+ -07 



- -12 



- -37 



- -53 



- -37 



- -15 



•00 



+ -11 



