ON THE MAGNETIC DEl'I.IX \ T I N. 



The following table contains the number of observations used in the discussion 

 of the lunar-diurnal variation : — 



1840. 



1841. 



1842. 



1843 



1844. 





January . 

 February . 

 March . . 

 April . . 

 May . . 

 June . . 

 July . . 

 August 

 September 

 October 

 Novenibw 

 December 



300 

 272 

 269 

 253 

 22:; 

 271 

 237 



168 

 263 

 293 

 283 



27,; 



276 

 292 

 262 

 250 

 214 

 2:;, i 

 268 



265 

 257 

 298 

 278 

 285 

 280 

 267 

 254 

 247 

 221 

 289 

 316 



276 

 309 

 300 



291 1 



244 

 2s :: 

 571 

 590 

 595 



577 

 571 

 551 

 522 

 596 

 566 

 593 

 541 

 . r i22 

 517 

 517 

 549 



591 



535 

 575 

 561 

 603 



542 



Sum 

 Total sum 



1825 



3075 



3257 



3458 



6622 



34n7 



21644 



