1882.] On the Specific Resistance of Mercury. 27 



May 4, 1882. 



THE PRESIDENT in the Chair. 



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

 for them. 



In pnrsnance of the Statutes, the names of Candidates recommended 

 for election into the Society were read from the Chair, as follows : — 



Ball, Professor Valentine, M.A. 

 Brady, George Stewardson, MJ3., 



F.L.S. 

 Buchanan, George, M.D. 

 Clarke, Charles Baron r M.A., 



F.L.S. 



Darwin, Francis. ta.A., F.L.S. 

 Dittmar, Prof essor William, F.C.S. 

 Gaskell, Walter Holbrook, M.D. 

 Glazebrook, Richard Tetley, 

 M.A. 



The following Paper was read : — 



Godman, Frederic Du Cane, 

 F.L.S. 



Hutchinson, Professor Jonathan, 



F.R.C.S. 

 Liversidge, Professor Archibald, 



F.G.S. 



Malet, Professor John C, M.A. 

 Niven, William Davidson, M.A. 

 Palgrave, Robert Henry Inglis, 



F.S.S. 

 Weldon, Walter, F.C.S. 



I. " On the Specific Resistance of Mercury." By Lord Ray- 

 leigh, F.R.S., Professor of Experimental Physics in the 

 University of Cambridge, and Mrs. H. Sidgwjck. Received 

 April 24, 1882. 



(Abstract,) 



The observations detailed in the paper were made with the view of 

 redetermining the relation between the B.A. unit and the mercury 

 unit of Siemens, i.e., the resistance of a column of mercury at 0°, one 

 metre in length, and one square millim. in section. 



According to Siemens' experiments, 



1 mercury unit='9536 B.A. unit, 



and according to Matthiessen and Hockin, 



1 mercury unit="9619 B.A. unit. 



The value resulting from our observations agrees pretty closely with 

 that of Siemens. We find 



1 mercury unit= "95418 B.A. unit. 



