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Rev. S. J. Perry and Prof. Balfour Stewart. [Dec. 10, 



December 10, 1885. 



Professor G. Gr. STOKES, D.C.L., President, in the Chair. 



The Presents received were laid on the table and thanks ordered for 

 them. 



The President announced that he had appointed as Yice- Presi- 

 dents — 



The Treasurer. 

 Dr. Archibald Greikie. 

 Sir Joseph Hooker. 

 Professor Huxley. 

 General Strachey. 



Dr. John Anderson (elected 1879) was admitted into the Society. 



Pursuant to notice, Professors Adolf Baeyer, Felix Klein, A. 

 Kowalewski, and Sven Loven were balloted for and elected Foreign 

 Members of the Society. 



The following* Papers were read: — 



I. " Preliminary Results of a Comparison of certain simultaneous 

 Fluctuations of the Declination at Kew and at Stony hurst 

 during the Years 1883 and 1884, as recorded by the 

 Magnetographs at these Observatories." By the Rev. 

 Stephen Joseph Perry, F.R.S., Director of the Stony- 

 hurst Observatory, and Balfour Stewart, LL.D., F.R.S., 

 Professor of Physics at the Owens College, Manchester. 

 Received October 31, 1885. 



Prom a comparison made by Messrs. Sidgreaves and Stewart 

 (" Proc. Roy. Soc," October, 1868), between a few prominent simul- 

 taneous changes of declination at Kew and at Stonyhurst, it appeared 

 that the ratio between the magnitudes of such changes was not con- 

 stant, but depended to some extent upon the abruptness of the dis- 

 turbance. 



With the view of examining into this matter, we have made a 

 somewhat more detailed comparison, selecting for this purpose some 



